Research activity information

• Mar. 2015 日本農芸化学会, 農芸化学奨励賞, 光合成CO2固定酵素RuBisCOの機能進化研究

  ASHIDA HIROKI

  Japan society


• May 2010 日本生化学会近畿支部, 優秀発表賞, RuBisCO-like proteinを用いた光合成CO2固定酵素RuBisCOの分子進化研究

  ASHIDA HIROKI

  Japan society

• Transient molecular chimerism for exploiting xenogeneic organelles.

  Yuichiro Kashiyama, Moe Maruyama, Masami Nakazawa, Tsuyoshi Kagamoto, Hiroki Imanishi, Sayaka Yamamoto, Mio Inoue, Ryo Onuma, Goro Tanifuji, Hiroki Ashida, Noriko Inada, Koichiro Awai, Shin-Ya Miyagishima

  The symbiogenetic origin of organelles, such as chloroplasts, is established, and organelle genomes provide evidence of prokaryotic ancestry. Nevertheless, most organelle proteins are nuclear-encoded and function in concert with those expressed from the organelle genomes, representing constitutive molecular chimerism. The evolutionary forces generating chimerism have been widely discussed, but without much evidence. Here we provide biochemical evidence of transient molecular chimerism in nature, along with a possible mechanistic explanation for chimerism. In the flagellate, Rapaza viridis, nuclear-encoded proteins support photosynthesis in transient, xenogeneic chloroplasts (kleptoplasts) acquired from the green alga Tetraselmis sp. We focused on two putative kleptoplast-targeted proteins: a RuBisCO small subunit-like protein (RvRbcS-like) and a RuBisCO activase homologue. Immunofluorescence microscopy confirmed the kleptoplast localization of the proteins, and the knockdown and knockout experiments demonstrated impaired photosynthesis, particularly for RvRbcS-like. The unique carboxyl-terminal extension of the RvRbcS-like protein suggests that it has an additional role in pyrenoid reorganization, a key step in kleptoplast remodelling. Protein translocation into kleptoplasts requires rapid, de novo assembly of transport systems after each acquisition, unlike the constitutive chimerism of established organelles. This previously unreported phenomenon in eukaryotes positions R. viridis as a unique, genetically tractable model for investigating the molecular and evolutionary origins of organelles.

  Mar. 2026, Nature communications, 17(1) (1), English, International magazine

  [Refereed]

  Scientific journal


• Metabolic analysis reveals the contribution of mechanosensitive channel MscM to extracellular release of glutamate in glycogen-deficient Synechococcus elongatus

  Yuichi Kato, Kouhei Kamasaka, Mami Matsuda, Hiroko Koizumi, Ryudo Ohbayashi, Hiroki Ashida, Akihiko Kondo, Tomohisa Hasunuma

  Elsevier BV, Dec. 2024, Journal of Bioscience and Bioengineering

  [Refereed]

  Scientific journal


• Glycogen deficiency enhances carbon partitioning into glutamate for an alternative extracellular metabolic sink in cyanobacteria.

  Yuichi Kato, Ryota Hidese, Mami Matsuda, Ryudo Ohbayashi, Hiroki Ashida, Akihiko Kondo, Tomohisa Hasunuma

  Glycogen serves as a metabolic sink in cyanobacteria. Glycogen deficiency causes the extracellular release of distinctive metabolites such as pyruvate and 2-oxoglutarate upon nitrogen depletion; however, the mechanism has not been fully elucidated. This study aimed to elucidate the mechanism of carbon partitioning in glycogen-deficient cyanobacteria. Extracellular and intracellular metabolites in a glycogen-deficient ΔglgC mutant of Synechococcus elongatus PCC 7942 were comprehensively analyzed. In the presence of a nitrogen source, the ΔglgC mutant released extracellular glutamate rather than pyruvate and 2-oxoglutarate, whereas its intracellular glutamate level was lower than that in the wild-type strain. The de novo synthesis of glutamate increased in the ΔglgC mutant, suggesting that glycogen deficiency enhanced carbon partitioning into glutamate and extracellular excretion through an unidentified transport system. This study proposes a model in which glutamate serves as the prime extracellular metabolic sink alternative to glycogen when nitrogen is available.

  Feb. 2024, Communications biology, 7(1) (1), 233 - 233, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• ppGpp accumulation reduces the expression of the global nitrogen homeostasis-modulating NtcA regulon by affecting 2-oxoglutarate levels

  Ryota Hidese, Ryudo Ohbayashi, Yuichi Kato, Mami Matsuda, Kan Tanaka, Sousuke Imamura, Hiroki Ashida, Akihiko Kondo, Tomohisa Hasunuma

  Abstract The cyanobacterium Synechococcus elongatus PCC 7942 accumulates alarmone guanosine tetraphosphate (ppGpp) under stress conditions, such as darkness. A previous study observed that artificial ppGpp accumulation under photosynthetic conditions led to the downregulation of genes involved in the nitrogen assimilation system, which is activated by the global nitrogen regulator NtcA, suggesting that ppGpp regulates NtcA activity. However, the details of this mechanism have not been elucidated. Here, we investigate the metabolic responses associated with ppGpp accumulation by heterologous expression of the ppGpp synthetase RelQ. The pool size of 2-oxoglutarate (2-OG), which activates NtcA, is significantly decreased upon ppGpp accumulation. De novo ¹³C-labeled CO₂ assimilation into the Calvin-Benson-Bassham cycle and glycolytic intermediates continues irrespective of ppGpp accumulation, whereas the labeling of 2-OG is significantly decreased under ppGpp accumulation. The low 2-OG levels in the RelQ overexpression cells could be because of the inhibition of metabolic enzymes, including aconitase, which are responsible for 2-OG biosynthesis. We propose a metabolic rearrangement by ppGpp accumulation, which negatively regulates 2-OG levels to maintain carbon and nitrogen balance.

  Springer Science and Business Media LLC, Dec. 2023, Communications Biology, 6(1) (1)

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Effect of chronic administration with human thioredoxin-1 transplastomic lettuce on diabetic mice.

  Rie Watanabe, Hiroki Ashida, Mikiko Kobayashi-Miura, Akiho Yokota, Junji Yodoi

  Scope: Human thioredoxin-1 (hTrx-1) is a defensive protein induced by various stresses and exerts antioxidative and anti-inflammatory effects. Previously, we described a transplastomic lettuce overexpressing hTrx-1 that exerts a protective effect against oxidative damage in a pancreatic β-cell line. In this study, we treated diabetic mice (Akita mice) with exogenous hTrx-1 and evaluated the effects. Methods and results: Treatment with drinking water and single applications of exogenous hTrx-1 did not influence the feeding, drinking behavior, body weight, blood glucose, or glycosylated hemoglobin (HbA1c) levels in Akita mice. However, chronic administration of a 10% hTrx-1 lettuce-containing diet was associated with a significant reduction from the baseline of HbA1c levels compared with mice fed a wild-type lettuce-containing diet. It also resulted in an increased number of goblet cells in the small intestine, indicating that mucus was synthesized and secreted. Conclusion: Our results revealed that the administration of an hTrx-1 lettuce-containing diet improves the baseline level of HbA1c in Akita mice. This effect is mediated through goblet cell proliferation and possibly related to protection against postprandial hyperglycemia by mucus, which results in the improvement of blood glucose control. These findings suggest that the hTrx-1 lettuce may be a useful tool for the continuous antioxidative and antidiabetic efficacies of the hTrx-1 protein.

  Aug. 2021, Food science & nutrition, 9(8) (8), 4232 - 4242, English, International magazine

  [Refereed]

  Scientific journal


• Reaction of ribulose biphosphate carboxylase/oxygenase assembled on a DNA scaffold

  Huyen Dinh, Eiji Nakata, Peng Lin, Masayuki Saimura, Hiroki Ashida, Takashi Morii

  Nov. 2019, BIOORGANIC & MEDICINAL CHEMISTRY, 27(22) (22), 115120 - 115120, English, International magazine

  [Refereed]

  Scientific journal


• Learning RuBisCO's birth and subsequent environmental adaptation

  Hiroki Ashida, Eiichi Mizohata, Akiho Yokota

  Feb. 2019, BIOCHEMICAL SOCIETY TRANSACTIONS, 47(1) (1), 179 - 185, English, International magazine

  [Refereed]

  Link to Kobe Univ. Repository (Kernel)


• Increasing photosynthesis/RuBisCO and CO2-concentrating mechanisms

  Hiroki Ashida, Akiho Yokota

  Elsevier, Jan. 2019, Comprehensive Biotechnology, 169 - 180, English

  In book


• Revisiting the methionine salvage pathway and its paralogues

  Agnieszka Sekowska, Hiroki Ashida, Antoine Danchin

  Jan. 2019, MICROBIAL BIOTECHNOLOGY, 12(1) (1), 77 - 97, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A RuBisCO-mediated carbon metabolic pathway in methanogenic archaea

  Takunari Kono, Sandhya Mehrotra, Chikako Endo, Natsuko Kizu, Mami Matusda, Hiroyuki Kimura, Eiichi Mizohata, Tsuyoshi Inoue, Tomohisa Hasunuma, Akiho Yokota, Hiroyoshi Matsumura, Hiroki Ashida

  Jan. 2017, NATURE COMMUNICATIONS, 8, 14007 - 14007, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Potato yield enhancement through intensification of sink and source performances

  Akira Katoh, Hiroki Ashida, Ichiro Kasajima, Shigeru Shigeoka, Akiho Yokota

  Jan. 2015, BREEDING SCIENCE, 65(1) (1), 77 - 84, English, Domestic magazine

  [Refereed]

  Scientific journal


• Plausible Novel Ribose Metabolism Catalyzed by Enzymes of the Methionine Salvage Pathway in Bacillus subtilis

  Toshihiro Nakano, Yohtaro Saito, Akiho Yokota, Hiroki Ashida

  May 2014, BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 77(5) (5), 1104 - 1107, English, International magazine

  [Refereed]

  Scientific journal


• Structural and biochemical basis for the inhibition of cell death by APIP, a methionine salvage enzyme

  Wonchull Kang, Se Hoon Hong, Hye Min Lee, Na Yeon Kim, Yun Chan Lim, Le Thi My Le, Bitna Lim, Hyun Chul Kim, Tae Yeon Kim, Hiroki Ashida, Akiho Yokota, Sang Soo Hah, Keun Ho Chun, Yong-Keun Jung, Jin Kuk Yang

  Jan. 2014, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 111(1) (1), E54 - E61, English, International magazine

  [Refereed]

  Scientific journal


• MtnBD Is a Multifunctional Fusion Enzyme in the Methionine Salvage Pathway of Tetrahymena thermophila

  Toshihiro Nakano, Izuru Ohki, Akiho Yokota, Hiroki Ashida

  Dec. 2013, PLOS ONE, 8(7) (7), e67385, English, International magazine

  [Refereed]

  Scientific journal


• His267 is involved in carbamylation and catalysis of RuBisCO-like protein from Bacillus subtilis

  Toshihiro Nakano, Yohtaro Saito, Akiho Yokota, Hiroki Ashida

  Feb. 2013, BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 431(2) (2), 176 - 180, English, International magazine

  [Refereed]

  Scientific journal


• Traveling waves of circadian gene expression in lettuce

  Kazuya Ukai, Koji Inai, Norihito Nakamichi, Hiroki Ashida, Akiho Yokota, Yusuf Hendrawan, Haruhiko Murase, Hirokazu Fukuda

  2012, Environmental Control in Biology, 50(3) (3), 237 - 246, English

  [Refereed]

  Scientific journal


• Increasing Photosynthesis/RuBisCO and CO2-Concentrating Mechanisms

  H. Ashida, A. Yokota

  Elsevier Inc., Sep. 2011, Comprehensive Biotechnology, Second Edition, 4, 165 - 176, English

  [Refereed]

  In book


• Production of biologically active human thioredoxin 1 protein in lettuce chloroplasts

  Soon Lim, Hiroki Ashida, Rie Watanabe, Koji Inai, Yun-Soo Kim, Keiko Mukougawa, Hirokazu Fukuda, Ken-ichi Tomizawa, Kei-ichi Ushiyama, Hiroshi Asao, Masahiro Tamoi, Hiroshi Masutani, Shigeru Shigeoka, Junji Yodoi, Akiho Yokota

  Jul. 2011, PLANT MOLECULAR BIOLOGY, 76(3-5) (3-5), 335 - 344, English, International magazine

  [Refereed]

  Scientific journal


• Generation of transplastomic lettuce with enhanced growth and high yield.

  Yaka Ichikawa, Masahiro Tamoi, Harumi Sakuyama, Takanori Maruta, ASHIDA HIROKI, Akiho Yokota, Shigeru Shigeoka

  Nov. 2010, GM Crops, 1, 322 - 326, English

  [Refereed]

  Scientific journal


• A DEAD box protein is required for formation of a hidden break in Arabidopsis chloroplast 23S rRNA

  Kenji Nishimura, Hiroki Ashida, Taro Ogawa, Akiho Yokota

  Sep. 2010, PLANT JOURNAL, 63(5) (5), 766 - 777, English, International magazine

  [Refereed]

  Scientific journal


• An evolutionally conserved Lys122 is essential for function in Rhodospirillum rubrum bona fide RuBisCO and Bacillus subtilis RuBisCO-like protein

  Toshihiro Nakano, Hiroki Ashida, Eiichi Mizohata, Hiroyoshi Matsumura, Akiho Yokota

  Feb. 2010, BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 392(2) (2), 212 - 216, English, International magazine

  [Refereed]

  Scientific journal


• Structure of the apo decarbamylated form of 2,3-diketo-5-methylthiopentyl-1-phosphate enolase from Bacillus subtilis

  Haruka Tamura, Yohtaro Saito, Hiroki Ashida, Yasushi Kai, Tsuyoshi Inoue, Akiho Yokota, Hiroyoshi Matsumura

  Sep. 2009, ACTA CRYSTALLOGRAPHICA SECTION D-STRUCTURAL BIOLOGY, 65, 942 - 951, English

  [Refereed]

  Scientific journal


• A Phosphofructokinase B-Type Carbohydrate Kinase Family Protein, NARA5, for Massive Expressions of Plastid-Encoded Photosynthetic Genes in Arabidopsis

  Taro Ogawa, Kenji Nishimura, Takehiko Aoki, Hisabumi Takase, Ken-Ichi Tomizawa, Hiroki Ashida, Akiho Yokota

  Sep. 2009, PLANT PHYSIOLOGY, 151(1) (1), 114 - 128, English, International magazine

  [Refereed]

  Scientific journal


• Structure of the apo decarbamylated form of 2,3-diketo-5-methylthiopentyl-1-phosphate enolase from Bacillus subtilis.

  Haruka Tamura, Yohtaro Saito, Hiroki Ashida, Yasushi Kai, Tsuyoshi Inoue, Akiho Yokota, Hiroyoshi Matsumura

  2,3-Diketo-5-methylthiopentyl-1-phosphate enolase (DK-MTP-1P enolase), a RuBisCO-like protein (RLP), catalyzes the enolization of 2,3-diketo-5-methylthiopentyl-1-phosphate. The crystal structure of the apo decarbamylated form (E form) of Bacillus subtilis DK-MTP-1P enolase (Bs-DK-MTP-1P enolase) has been determined at 2.3 A resolution. The overall structure of the E form of Bs-DK-MTP-1P enolase highly resembles that of Geobacillus kaustophilus DK-MTP-1P enolase (Gk-DK-MTP-1P enolase), with the exception of a few insertions or deletions and of a few residues at the active site. In the E form of Bs-DK-MTP-1P enolase, Lys150 (equivalent to Lys175 in RuBisCO) at the active site adopts a conformation that is distinct from those observed in the other forms of Gk-DK-MTP-1P enolase. This unusual conformational change appears to be induced by changes in the varphi and psi angles of Gly151, which is conserved in the sequences of the Bs-DK-MTP-1P and Gk-DK-MTP-1P enolases but not in those of RuBisCOs. The loop at 303-312, equivalent to the catalytic loop termed ;loop-6' in RuBisCO, is in a closed conformation in the E form of Bs-DK-MTP-1P enolase. The closed conformation appears to be stabilized by Pro312, which is conserved in the sequences of several RLPs (equivalent to Glu338 in RuBisCO). Based on these results, the characteristic structural features of DK-MTP-1P enolase are discussed.

  Sep. 2009, Acta crystallographica. Section D, Biological crystallography, 65(Pt 9) (Pt 9), 942 - 51, English, International magazine

  [Refereed]

  Scientific journal


• Structural and Functional Similarities between a Ribulose-1,5-bisphosphate Carboxylase/Oxygenase (RuBisCO)-like Protein from Bacillus subtilis and Photosynthetic RuBisCO

  Yohtaro Saito, Hiroki Ashida, Tomoko Sakiyama, Nicole Tandeau de Marsac, Antoine Danchin, Agnieszka Sekowska, Akiho Yokota

  May 2009, JOURNAL OF BIOLOGICAL CHEMISTRY, 284(19) (19), 13256 - 13264, English, International magazine

  [Refereed]

  Scientific journal


• Crystallization and preliminary X-ray analysis of 2,3-diketo-5-methylthiopentyl-1-phosphate enolase from Bacillus subtilis

  Haruka Tamura, Hiroki Ashida, Shogo Koga, Yohtaro Saito, Tomonori Yadani, Yasushi Kai, Tsuyoshi Inoue, Akiho Yokota, Hiroyoshi Matsumura

  Feb. 2009, ACTA CRYSTALLOGRAPHICA SECTION F-STRUCTURAL BIOLOGY COMMUNICATIONS, 65(Pt 2) (Pt 2), 147 - 150, English, International magazine

  [Refereed]

  Scientific journal


• RuBisCO-like proteins as the enolase enzyme in the methionine salvage pathway: functional and evolutionary relationships between RuBisCO-like proteins and photosynthetic RuBisCO

  Hiroki Ashida, Yohtaro Saito, Toshihiro Nakano, Nicole Tandeau de Marsac, Agnieszka Sekowska, Antoine Danchin, Akiho Yokota

  May 2008, JOURNAL OF EXPERIMENTAL BOTANY, 59(7) (7), 1543 - 1554, English, International magazine

  [Refereed]

  Scientific journal


• Enzymatic characterization of 5-methylthioribulose-1-phosphate dehydratase of the methionine salvage pathway in Bacillus subtilis

  Hiroki Ashida, Yohtaro Saito, Chojiro Kojinia, Akiho Yokota

  Apr. 2008, BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 72(4) (4), 959 - 967, English

  [Refereed]

  Scientific journal


• Crystal structure of RuBisCO-like protein from Bacillus subtilis

  Haruka Tamura, Yohtaro Saito, Hiroki Ashida, Hiroyoshi Matsumura, Yasushi Kai, Akiho Yokota, Tsuyoshi Inoue

  2008, ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES, 64, C261 - C262, English

  [Refereed]


• Crystal structure of 5-methylthioribose 1-phosphate isomerase product complex from Bacillus subtilis: Implications for catalytic mechanism

  Haruka Tamura, Yohtaro Saito, Hiroki Ashida, Tsuyoshi Inoue, Yasushi Kai, Akiho Yokota, Hiroyoshi Matsumura

  Jan. 2008, PROTEIN SCIENCE, 17(1) (1), 126 - 135, English

  [Refereed]

  Scientific journal


• Molecular mechanisms of RuBisCO biosynthesis in higher plants

  Kenji Nishimura, Taro Ogawa, Hiroki Ashida, Akiho Yokota

  2008, PLANT BIOTECHNOLOGY, 25(3) (3), 285 - 290, English

  [Refereed]

  Scientific journal


• Enzymatic characterization of 5-methylthioribose 1-Phosphate isomerase from bacillus subtilis

  Yohtaro Saito, Hiroki Ashida, Chopro Kojlma, Haruka Tamura, Hiroyoshi Matsumura, Yasushi Kai, Akiho Yokota

  Aug. 2007, BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 71(8) (8), 2021 - 2028, English

  [Refereed]

  Scientific journal


• Improvement of cyanobacterial RuBisCO by introducing the latch structure of red algal RuBisCO with high specificity for CO2 fixation.

  Nana Ninomiya, Hiroki Ashida, Akiho Yokota

  2007, PLANT AND CELL PHYSIOLOGY, 48, S71 - S71, English

  [Refereed]


• Characterization of Arabidopsis mutants for quantitative regulation of RuBisCO.

  Taro Ogawa, Takehiko Aoki, Hiroki Ashida, Akiho Yokota

  2007, PLANT AND CELL PHYSIOLOGY, 48, S214 - S214, English

  [Refereed]


• A new Rubisco-like protein coexists with a photosynthetic Rubisco in the planktonic cyanobacteria Microcystis

  Alyssa Carre-Mlouka, Annick Mejean, Philippe Quillardet, Hiroki Ashida, Yohtaro Saito, Akiho Yokota, Isabelle Callebaut, Agnieszka Sekowska, Elke Dittmann, Christiane Bouchier, Nicole Tandeau de Marsac

  Aug. 2006, JOURNAL OF BIOLOGICAL CHEMISTRY, 281(34) (34), 24462 - 24471, English

  [Refereed]

  Scientific journal


• Screening of RuBisCO biosynthesis mutants in Arabidopsis thaliana.

  Ogawa Taro, Asida Hiroki, Takase Naobumi, Tomizawa Ken-ichi, Yokota Akiho

  Ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCO) is a key enzyme in photosynthetic CO₂ fixation. In higher plants, RuBisCO is a multimeric enzyme composed of large and small subunits encoded by the chloroplast rbcL gene and nuclear rbcS genes. RuBisCO is biosynthesized via complex processes, hence overall mechanism is still unknown. To understand the molecular mechanism for these processes, we have designed a positive method for screening RuBisCO biosynthesis mutants using methionine sulfoximine (MSX) which is an inhibitor of glutamine synthetase. Wild-type plants treated with MSX could not survive because photorespiratory NH₃ accumulated massively depending on RuBisCO oxygenase activity. In contrast, rca mutants which lacked the activation of RuBisCO could survive under the same condition. After screened of 11000 EMS mutagenized seedlings, we obtained eight mutants which show either decreased RuBisCO amounts or low activities. These results indicate that this system is useful for screening of RuBisCO biosynthesis mutants.

  The Japanese Society of Plant Physiologists, 2006, Plant and Cell Physiology Supplement, 2006, 119 - 119


• Was photosynthetic RuBisCO recruited by acquisitive evolution from RuBisCO-like proteins involved in sulfur metabolism?

  H Ashida, A Danchin, A Yokota

  Jun. 2005, RESEARCH IN MICROBIOLOGY, 156(5-6) (5-6), 611 - 618, English

  [Refereed]

  Scientific journal


• Crystallization and preliminary X-ray analysis of methylthioribose-1-phosphate isomerase from Bacillus subtilis

  H Tamura, H Matsumura, T Inoue, H Ashida, Y Saito, A Yokota, Y Kai

  Jun. 2005, ACTA CRYSTALLOGRAPHICA SECTION F-STRUCTURAL BIOLOGY AND CRYSTALLIZATION COMMUNICATIONS, 61, 595 - 598, English

  [Refereed]

  Scientific journal


• Crystal Structure of Methylthioribose-1-phosphate Isomerase from Bacillus subtilis

  Haruka Tamura, Hiroyoshi Matsumura, Tsuyoshi Inoue, Hiroki Ashida, Yohtaro Saito, Akiho Yokota, Yasushi Kai

  2005, ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES, 61, C207 - C208, English

  [Refereed]


• Bacterial variations on the methionine salvage pathway

  A Sekowska, Denervaud, V, H Ashida, K Michoud, D Haas, A Yokota, A Danchin

  Mar. 2004, BMC MICROBIOLOGY, 4, English

  [Refereed]

  Scientific journal


• A functional link between RuBisCO-like protein of Bacillus and photosynthetic RuBisCO

  H Ashida, Y Saito, C Kojima, K Kobayashi, N Ogasawara, A Yokota

  Oct. 2003, SCIENCE, 302(5643) (5643), 286 - 290, English

  [Refereed]

  Scientific journal


• Crystal structure of activated ribulose-1,5-bisphosphate carboxylase/oxygenase from green alga Chlamydomonas reinhardtii complexed with 2-carboxyarabinitol-1,5-bisphosphate

  E Mizohata, H Matsumura, Y Okano, M Kumei, H Takuma, J Onodera, K Kato, N Shibata, T Inoue, A Yokota, Y Kai

  Feb. 2002, JOURNAL OF MOLECULAR BIOLOGY, 316(3) (3), 679 - 691, English

  [Refereed]

  Scientific journal

• 低分子抗酸化物含有食による糖尿病モデルマウス血糖コントロールの改善

  渡邉理江, 蘆田弘樹, 増谷弘, 三浦美樹子, 三浦美樹子, 横田明穂, 淀井淳司, 淀井淳司

  (株)インフォノーツパブリッシング, Dec. 2019, 機能性食品と薬理栄養, 13(3) (3), 180 - 180, Japanese

  Summary national conference


• 二酸化炭素の環境問題と利用 光合成二酸化炭素固定酵素RuBisCO

  蘆田弘樹

  01 Nov. 2018, Journal of the Society of Inorganic Materials, Japan, 25(397) (397), 406‐411, Japanese


• メタン生成アーキアにおけるRuBisCOを利用した新規CO₂固定経路

  蘆田弘樹

  Oct. 2017, 酵素工学ニュ-ス, (78) (78), 14‐18, Japanese


• 多彩な戦略で挑むシアノバクテリア由来の燃料生産 持続可能な第三世代バイオ燃料生産の最前線

  日原由香子, 朝山宗彦, 蘆田弘樹, 天尾豊, 新井宗仁, 粟井光一郎, 得平茂樹, 小山内崇, 鞆達也, 成川礼, 蓮沼誠久, 増川一

  日本農芸化学会 ; 1962-, 20 Jan. 2017, 化学と生物, 55(2) (2), 88‐97 - 97, Japanese


• CO₂資源化:研究者たちの挑戦 4 CO₂資源化を目指した光合成炭素固定酵素RuBisCOの機能進化研究

  蘆田弘樹

  日本化学会, 01 Nov. 2016, 化学と工業, 69(11) (11), 957‐959 - 959, Japanese


• ヒトチオレドキシン-1高発現レタス長期食餌負荷による糖尿病モデルマウス血糖コントロールの改善

  渡邉 理江, 蘆田 弘樹, 増谷 弘, 三浦 美樹子[小林], 横田 明穂, 淀井 淳司

  (公社)日本生化学会, Dec. 2015, 日本生化学会大会・日本分子生物学会年会合同大会講演要旨集, 88回・38回, [1P0546] - [1P0546], English


• ジャガイモ塊茎を形成するストロンの原基である地中腋芽におけるRanGTPase1遺伝子の発現解析

  KATO AKIRA, FUKUI YUKI, ASHIDA HIROKI, AKASHI KIN'YA, KAJIKAWA MASATAKA, SHIGEOKA SHIGERU, YOKOTA AKIHO

  05 Mar. 2014, 日本農芸化学会大会講演要旨集(Web), 2014, 2C04A08 (WEB ONLY), Japanese


• シアノバクテリアの光合成能力を利用したバイオ燃料生産

  蘆田弘樹

  日本生物工学会, 25 Jun. 2013, 生物工学会誌, 91(6) (6), 352 - 352, Japanese


• シアノバクテリアの光合成能力を利用したバイオ燃料生産

  ASHIDA HIROKI

  Jun. 2013, 生物工学会誌, 91(6) (6), 352, Japanese

  [Invited]

  Introduction scientific journal


• レタス葉緑体における医療用タンパク質ヒトチオレドキシン1の生産

  ASHIDA HIROKI, LIM SOON, WATANABE RIE, INAI KOJI, KIM YUN-SOO, MUKAIGAWA KEIKO, FUKUDA HIROKAZU, TAMOI MASAHIRO, MASUTANI HIROSHI, SHIGEOKA SHIGERU, YODOI JUNJI, YOKOTA AKIHO

  The production of human therapeutic proteins in plants provides opportunities for low-cost production, and minimizes the risk of contamination from potential human pathogens. Chloroplast genetic engineering is a particularly promising strategy, because plant chloroplasts can produce large amounts of foreign target proteins. Human thioredoxin 1 (hTrx1) is an antioxidant protein, and can suppress various diseases in mice. Therefore, hTrx1 is a prospective candidate as a human therapeutic protein.
  We created transplastomic lettuce expressing hTrx1 gene under the control of the tobacco psbA promoter. The hTrx1 protein accumulated to approximately 3% of total soluble protein in mature leaves. The hTrx1 protein purified from lettuce leaves was functionally active, and reduced insulin disulfides. The purified protein protected MIN6 cells from damage by hydrogen peroxide, as reported previously for a recombinant hTrx1 form Escherichia coli. This is the first report for expression of the biologically active hTrx1 protein in plant chloroplasts. Considering that this expression host is an edible crop plant, this transplastomic lettuce may be suitable for oral delivery of hTrx1.

  The Japanese Society of Plant Physiologists, 11 Mar. 2011, 日本植物生理学会年会要旨集, 52nd, 129 - 75, Japanese


• 光合成CO₂固定酵素RuBisCO誕生の秘密 RuBisCO‐like proteinが隠しもつRuBisCOとしての潜在能力

  齋藤洋太郎, 蘆田弘樹

  Japan Society for Bioscience, Biotechnology, and Agrochemistry, 01 Nov. 2010, 化学と生物, 48(11) (11), 739 - 742, Japanese


• 医・農・工融合によるヒトチオレドキシン1産生レタスの生産技術の開発

  ASHIDA HIROKI, TAMOI MASAHIRO, FUKUDA HIROKAZU, WATANABE RIE, SOON LIM, INAI KOJI, MUKAIGAWA KEIKO, YAMAKAWA HIRONOBU, KATO MASAO, USHIYAMA KEIICHI, MASUTANI HIROSHI, SHIGEOKA SHIGERU, YODOI JUNJI, YOKOTA AKIHO

  29 Sep. 2010, バイオテクノロジーシンポジウム予稿集, 28th, 56 - 57, Japanese


• 光合成CO2固定酵素RuBisCOとRuBisCO-like Proteinの比較研究が明らかにしたこと--RuBisCOはどのようにCO2固定能を獲得したのか? (酵素工学研究会第59回講演会)

  蘆田 弘樹, 横田 明穗

  酵素工学研究会, 25 Apr. 2008, 酵素工学研究会講演会講演要旨集, 59, 11 - 18, Japanese


• Rubisco satellite meeting Reaserch Frontiers with Rubisco, the “Elixir of Life” in the Biospherに参加して

  蘆田 弘樹

  Dec. 2007, 光合成研究, 17, 84 - 86

  [Invited]


• 医・農・工融合によるヒトチオレドキシン1産生レタスの生産技術の開発

  YOKOTA AKIHO, SHIGEOKA SHIGERU, YODOI JUNJI, ASHIDA HIROKI, TAMOI MASAHIRO, HISAZUMI TAKAAKI, FUKUDA HIROKAZU, KATO NORIKO, SOON LIM, INAI KOJI, MASUTANI HIROSHI, AKASHI KIN'YA

  06 Nov. 2007, バイオテクノロジーシンポジウム予稿集, 25th, 117 - 118, Japanese


• Improvement of cyanobacterial RuBisCO by introducing the latch structure involved in high affinity for CO2 in red algal RuBisCO.

  N. Ninomiya, H. Ashida, A. Yokota

  Feb. 2007, PHOTOSYNTHESIS RESEARCH, 91(2-3) (2-3), 232 - 232, English

  Summary international conference


• Evolutionary potential of RuBisCO-like protein in Bacillus subtilis: Interaction with transition-state analogue of RuBisCO.

  Y. Saito, H. Ashida, A. Sekowska, A. Danchin

  Feb. 2007, PHOTOSYNTHESIS RESEARCH, 91(2-3) (2-3), 231 - 232, English

  Summary international conference


• Isolation and characterization of genes necessary for achievement of RuBisCO accumulation in Arabidopsis thaliana.

  T. Ogawa, K. Nishimura, H. Ashida, A. Yokota

  Feb. 2007, PHOTOSYNTHESIS RESEARCH, 91(2-3) (2-3), 264 - 264, English

  Summary international conference


• The completion of the Calvin cycle via molecular evolution

  ASHIDA Hiroki, YOKOTA Akiho

  01 Dec. 2006, Journal of plant research, 119, 13 - 13, English


• RuBisCO生合成機構の分子遺伝学的解析

  小川太郎, 蘆田弘樹, 高瀬尚文, 富澤健一, 横田明穂

  2006, 日本植物生理学会年会要旨集, 47th


• Structure-function relationship between photosynthetic RuBisCO and the RuBisCO-like protein of Bacillus subtilis

  Y Saito, S Agnieszka, H Ashida, D Antoine, A Yokota

  2005, PLANT AND CELL PHYSIOLOGY, 46, S75 - S75, English

  Summary international conference


• 光合成CO2固定酵素RuBisCOの起源が明らかに! 枯草菌のメチオニン代謝酵素ＲＬＰに秘められた進化の跡

  蘆田 弘樹

  日本農芸化学会, Jul. 2004, 化学と生物, 42(7) (7), 424 - 426, Japanese

  [Refereed][Invited]


• The common reaction between photosynthetic Ribulosebisphosphate carboxylase/oxygenase (RuBisCO) and Bacillus subtilis RuBisCO-like protein (RLP)

  H Ashida, Y Saitou, K Kobayashi, CJ Kozima, N Ogasawara, A Yokota

  2003, PLANT AND CELL PHYSIOLOGY, 44, S61 - S61, English

  Summary international conference

• 藻類オイル開発研究の最前線―微細藻類由来バイオ燃料の生産技術研究

  岡田 茂, 河野 重行, 神田 英輝, 石川 孝博, 田茂井 政宏, 鈴木 健吾, 社ユーグレナ, 重岡 成, 中嶋 信美, 増田 篤稔, ヤ, 蘆田 弘樹, 広瀬 侑, 池内 昌彦, 関口 弘志

  エヌティーエス, Nov. 2013, ISBN: 4864690855

  


• 形質転換プロトコール 植物編

  田部井 豊

  化学同人, Sep. 2012, ISBN: 475981485X

  


• プラントミメティックス―植物に学ぶ (アドバンスト・バイオミメティックスシリーズ (1))

  甲斐 昌一, 森川 弘道, 鈴木 泰博

  エヌ・ティー・エス, Aug. 2006, ISBN: 4860431316

  


• 広川 タンパク質化学〈4巻〉酵素 4.4 リアーゼ2 (廣川タンパク質化学 4)

  泉井 桂

  廣川書店, Feb. 2005, ISBN: 4567160460

  

• 自己遮蔽効果が藍藻Synechococcus elongatus PCC7942の光合成・代謝・物質生産に及ぼす影響

  加藤 悠, 田中 謙也, 釜阪 紘平, 松田 真美, 小泉 裕子, 大林 龍胆, 蘆田 弘樹, 近藤 昭彦, 蓮沼 誠久

  第42回日本植物バイオテクノロジー学会, Sep. 2025

  Oral presentation


• Maintenance and control of carbon fixation in photosynthesis in a kleptoplasty

  Y. Kashiyama, M. Maruyama, T. Kagamoto, H. Imanishi, N. Inada, H. Ashida, M. Nakazawa

  12th International conference of photosynthesis and Hydrogen energy research for sustainability, Oct. 2024


• ラパザの核ゲノムコード「盗」葉緑体タンパク質

  丸山萌, 加賀本剛, 大沼亮, 宮城島進也, 蘆田弘樹, 稲田のりこ, 中澤昌美, 粟井光一郎, 柏山祐一郎

  日本共生生物学会第7回大会, Nov. 2023, Japanese

  Oral presentation


• ポリヒドロキシアルカン酸合成系を利⽤したスクリーニングによる RuBisCO の⾼活性多重変異体の獲得

  芥川柚月, 渡邉秀平, 藤原悠暉, 蜂須賀真一, 菊川寛史, 蘆田弘樹, 松本謙一郎

  2023年度日本農芸化学会北海道支部／第53回 日本栄養・食糧学会北海道支部 合同学術講演会, Aug. 2023


• グリコーゲン欠損が誘導するグルタミン酸放出現象の解明

  加藤悠一, 松田真実, 秀瀬涼太, 大林龍胆, 蘆田弘樹, 蓮沼誠久

  藍藻の分子生物学2022, Dec. 2022


• ポリヒドロキシアルカン酸生合成系を利用したRuBisCO高機能変異体のスクリーニング法開発

  渡邉秀平, 藤原悠輝, 永田暁洋, 工藤悠希, 松本直己, 齋藤樹里, 喜多幸, 冨田宏矢, 蘆田弘樹, 松本謙一郎

  2022年度生物工学会北日本支部シンポジウム, Dec. 2022


• ポリヒドロキシアルカン酸生合成系を利用したRuBisCO高機能変異体のスクリーニング法開発

  渡邉秀平, 藤原悠輝, 永田暁洋, 工藤悠希, 松本直己, 齋藤樹里, 喜多幸, 冨田宏矢, 蘆田弘樹, 松本謙一郎

  第74回日本生物工学会大会, Oct. 2022


• ラン藻グリコーゲン欠損株におけるグルタミン酸オーバーフロー現象の解明

  加藤悠一, 松田真実, 秀瀬涼太, 大林龍胆, 蘆田弘樹, 蓮沼誠久

  第16回メタボロームシンポジウム, Sep. 2022


• 組み換え大腸菌を利用したポリヒドロキシアルカン酸生合成系スクリーニングによる光合成細菌由来RuBisCO高機能変異体の獲得

  渡邉秀平, 藤原悠輝, 永田暁洋, 工藤悠希, 松本直己, 齋藤樹里, 喜多幸, 冨田宏矢, 蘆田弘樹, 松本謙一郎

  令和４年度日本農芸化学会北海道・東北支部合同支部会, Sep. 2022


• Rapaza viridisの盗葉緑体獲得過程におけるピレノイドの再構成メカニズム

  丸山萌, 加賀本剛, 中澤昌美, 蘆田弘樹, 粟井光一郎, 柏山祐一郎

  日本植物学会 第86回大会, Sep. 2022


• 49. シアノバクテリアNostoc sp. PCC7120におけるRuBisCO activase-like proteinの機能解析

  林悠介, 得平茂樹, 蘆田弘樹

  日本農芸化学会2022年度大会, Mar. 2022


• ラン藻の核酸分子グアノシン4-リン酸（ppGpp）の生理的役割と応用

  秀瀬涼太, 大林龍胆, 加藤悠一, 松田真美, 蘆田弘樹, 近藤昭彦, 蓮沼誠久

  先端バイオ工学研究センター成果発表会, Oct. 2021


• RuBisCO研究とその応用

  蘆田弘樹

  東京都立大学生命科学教室, Jul. 2021

  [Invited]


• RuBisCO経路を利用した組換え大腸菌によるポリヒドロキシアルカン酸の合成とRuBisCO評価系への応用

  藤原悠暉, 齋藤樹理, 永田暁洋, 大潟祥梧, 二宮太樹, 谷口遼, 松本直己, 堀千明, 大井俊彦, 蘆田弘樹, 松本謙一郎

  日本農芸化学会2021年度大会, Mar. 2021


• 好熱性と常温性シアノバクテリアRuBisCOの構造活性相関研究

  河野飛鳥, 磯野香奈子, 合田初奈, 林美彩希, 蘆田弘樹

  日本農芸化学会2020年度大会, Mar. 2020


• CO2固定酵素RuBisCOの多様な機能進化

  蘆田弘樹

  第4回光合成細菌ワークショップ, Mar. 2019

  [Invited]

  Invited oral presentation


• グリコール酸ポリマー合成系を用いたRubisCOの性能比較

  齋藤樹理, 工藤悠希, 堀千明, 大井俊彦, 蘆田弘樹, 松本謙一郎

  2018年度日本生物工学会北日本支部, Oct. 2018


• 光合成機能の改良と応用

  蘆田弘樹

  近畿バイオインダストリー振興会議 第４３回バイオマスイノベーション研究会, Mar. 2018

  Invited oral presentation


• チオレドキシン-1 高含有食による糖尿病モデルマウス血糖コントロールの改善

  渡邉理江, 蘆田弘樹, 増谷弘, 三浦美樹子, 横田明穂, 淀井淳司

  日本農芸化学会2018年度大会, Mar. 2018


• 常温性と好熱性シアノバクテリア間のサブユニットスワップ型 RuBisCO の解析

  磯野香奈子, 蘆田弘樹

  日本農芸化学会2018年度大会, Mar. 2018


• 光合成生物の枠を超えたCO2固定酵素RuBisCOの機能進化

  蘆田弘樹

  新光合成＆光合成若手の会ジョイント若手ワークショップ, Aug. 2017

  [Invited]

  Invited oral presentation


• 好熱性・常温生シアノバクテリアRuBisCOのCO2識別能力にスモールサブユニットが関与する

  磯野香奈子, 合田初奈, 河野卓成, 蘆田弘樹

  新光合成＆光合成若手の会ジョイント若手ワークショップ, Aug. 2017


• アーキアに発見した光合成カルビンサイクルの進化的原型

  河野卓成, Sandhya Mehrotra, 遠藤千夏子, 松田真実, 木村浩之, 蓮沼誠久, 横田明穂, 松村浩由, 蘆田弘樹

  日本農芸化学会2017年度大会, Mar. 2017


• 光合成機能の研究と応用

  蘆田弘樹

  日本品質管理学会第112回研究発表会, Sep. 2016

  [Invited]

  Invited oral presentation


• 植物を用いた未来型医薬用タンパク質生産

  ASHIDA HIROKI

  環境変動の生態・生理学に関する研究会, 2016, Japanese, Domestic conference

  Public discourse


• 光合成CO2固定酵素RuBisCOの機能進化研究からのCO2資源化への展開

  河野 卓成, ASHIDA HIROKI

  日本化学会第９６回春季年会特別企画 生命化学研究から見たCO2資源化：光合成研究と人工光合成の融合を目指して, 2016, Japanese, Domestic conference

  [Invited]

  Invited oral presentation


• C4光合成の炭酸固定酵素と脱炭酸酵素のC3植物への導入による代謝系の改変：水ストレス耐性の向上とその基盤のメタボローム解析

  西村 隆秀, 高木 祐子, 傳寳 雄大, 福崎 英一郎, ASHIDA HIROKI, 陀安 一郎, 秋田 求, 泉井 桂

  日本農芸化学会2016年度大会, 2016, Japanese, Domestic conference

  Poster presentation


• 光合成炭素固定酵素の機能進化

  ASHIDA HIROKI

  環境変動の生態・生理学に関する研究会, Mar. 2015, Japanese, Domestic conference

  Oral presentation


• 光合成CO2固定酵素RuBisCOの機能進化研究

  ASHIDA HIROKI

  日本農芸化学会 農芸化学奨励賞受賞講演会, Mar. 2015, Japanese, Domestic conference

  [Invited]

  Invited oral presentation


• 光合成CO2固定酵素RuBisCOの機能進化研究

  ASHIDA HIROKI

  日本農芸化学会関西支部第492回講演会 2015年度日本農芸化学会奨励賞受賞講演, 2015, Japanese, Domestic conference

  [Invited]

  Invited oral presentation


• ヒトチオレドキシン-1高発現レタス長期食餌負荷による糖尿病モデルマウス血糖コントロールの改善

  渡邉理江, ASHIDA HIROKI, 増谷弘, 三浦ー小林美樹子, 橫田明穂, 淀井淳司

  第３８回 日本分子生物学会, 2015, Japanese, Domestic conference

  Poster presentation


• ‘C4化’タバコにおける水利用効率および乾燥ストレス耐性の向上：δ13Cの測定およびメタボローム解析とアミノ酸分析による性格付け

  泉井 桂, 西村 隆秀, 高木 祐子, 明渡 絵里朱, 秋田 求, ASHIDA HIROKI, 横田 明穂, 陀安 一郎, 中山 泰宗, 傳寶 雄大, 平野 博人, 三輪 哲也

  日本植物生理学会2014年度大会, Mar. 2014, Japanese, Domestic conference

  Oral presentation


• ジャガイモ塊茎を形成するストロンの原基である地中腋芽におけるRanGTPase1遺伝子の発現機構

  加藤 彰, 福井由記, ASHIDA HIROKI, 明石 欣也, 梶川 昌孝, 重岡 成, 橫田 明穂

  日本農芸化学会2014年度大会, Mar. 2014, Japanese, Domestic conference

  Oral presentation


• シアノバクテリアにおけるRuBisCO発現量によるカルボキシソーム形成制御機構

  向川 佳子, 横田 明穂, ASHIDA HIROKI

  日本農芸化学会2014年度大会, Mar. 2014, Japanese, Domestic conference

  Oral presentation


• アーキア型phosphoribulokinaseの機能解析

  河野 卓成, 遠藤 千夏子, 木津 奈津子, 木村 浩之, 溝端 栄一, 井上 豪, 松村 浩由, 横田 明穂, ASHIDA HIROKI

  日本農芸化学会2014年度大会, Mar. 2014, Japanese, Domestic conference

  Oral presentation


• Applications of sequence-specific DNA binding adaptors for assembling proteins on DNA origami

  Huyen T.T. Dinh, Eiji Nakata, Tien A. Ngo, ASHIDA HIROKI, Akiho Yokota, Takashi Morii

  日本化学会第94回春季年会, Mar. 2014, English, 名古屋大学, Domestic conference

  Oral presentation


• バイオ燃料高生産のための炭素固定能を強化したスーパーシアノバクテリアの創成

  ASHIDA HIROKI

  JSTさきがけ第6回領域会議, Feb. 2014, Japanese, Domestic conference

  Others


• 光合成CO2固定酵素ルビスコの機能進化を探る

  ASHIDA HIROKI

  第27回インターゲノミクスセミナー, Dec. 2013, Japanese, Domestic conference

  Public discourse


• バイオ燃料高生産のための炭素固定能を強化したスーパーシアノバクテリアの創成

  ASHIDA HIROKI

  JSTさきがけ研究報告会, Nov. 2013, Japanese, Domestic conference

  Public discourse


• ラン藻を用いたエタノール高生産を目指したルビスコ機能強化研究

  ASHIDA HIROKI

  第4回藻類バイオ燃料生産技術研究会, Sep. 2013, Japanese, Domestic conference

  Public discourse


• 光合成CO2固定酵素ルビスコの基礎研究とその成果を用いた応用研究

  ASHIDA HIROKI

  東京大学生産技術研究所 第1回応用化学セミナー, Jul. 2013, Japanese, Domestic conference

  Public discourse


• アーキアが有する光合成カルビンサイクル酵素phosphoribulokinaseホモログの酵素学的解析

  河野 卓成, 遠藤 千夏子, 横田 明穂, ASHIDA HIROKI

  日本Archaea研究会第26回講演会, Jul. 2013, Japanese, Domestic conference

  Oral presentation


• Enzymatic analysis of archaeal homologues of phosphoribulokinase, a key enzyme in the photosynthetic Calvin cycle.

  Takunari Kohno, Chikako Endo, Akiho Yokota, ASHIDA HIROKI

  30th of the Gordon conference of Archaea, Jul. 2013, English, Italy, International conference

  Poster presentation


• C4光合成の炭素固定酵素（PEPC）と脱炭酸酵素（PCK）を葉緑体内で過剰発現させたタバコ（C3植物）における光合成能、水利用効率（WUE）および浸透圧ストレス耐性

  泉井 桂, 明渡 絵里朱, 西村 隆秀, ASHIDA HIROKI, 橋詰 恵丞, 高木 祐子, 横田 明穂, 秋田 求, 陀安 一郎

  第4回日本光合成学会年会, Jun. 2013, Japanese, Domestic conference

  Oral presentation

• Biochemical demonstration and functional verification of chimeric complex formation in kleptoplasy

  柏山 祐一郎, 稲田 のりこ, 蘆田 弘樹, 得津 隆太郎

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Fukui University of Technology, 01 Apr. 2024 - 31 Mar. 2027


• 未来社会創造事業（探索加速型）「細胞分裂制御技術による物質生産特化型ラン藻の創製と光合成的芳香族生産への応用」

  国立研究開発法人 科学技術振興機構, 未来社会創造事業（探索加速型）「地球規模課題である低炭素社会の実現」領域, 2019 - 2023, Coinvestigator


• Analysis of the molecular evolution of photosynthetic CO2-fixing pathway

  Ashida Hiroki

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Challenging Research (Exploratory), Challenging Research (Exploratory), Kobe University, 28 Jun. 2019 - 31 Mar. 2022

  The Calvin cycle is a primary metabolic pathway for CO2-fixing in plants, algae, and cyanobacteria. Ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) is the CO2-fixing enzyme in the Calvin cycle. Methanogenic archaea are not photosynthetic organisms but possess a unique CO2-fixing cycle which is composed of partial steps including RuBisCO catalyzing step from the Calvin cycle and Ribulose monophosphate pathway. Therefore, the methanogenic archaeal CO2-fixing pathway is thought to be a primitive metabolism of the photosynthetic Calvin cycle. In order to study molecular evolution of the Calvin cycle, we analyzed enzymatic properties of RuBisCO in this CO2-fixing pathway. Methanogenic archaeal RuBisCO shows very low maximum reaction rate for the carboxylase reaction and CO2/O2 relative specificity factor, as compared with photosynthetic RubisCOs.


• ムーンショット型研究開発事業「電気エネルギーを利用し大気CO2を固定するバ イオプロセスの研究開発」

  国立研究開発法人 新エネルギー・産業技術総合開発機構, ムーンショット型研究開発事業／ 地球環境再生に向けた持続可能な資源循環を実現, 2020 - 2022, Coinvestigator


• Improvement of photosynthesis by functional optimization of RuBisCO

  Ashida Hiroki

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2017 - 31 Mar. 2021, Principal investigator

  We found that the small subunit of Ribulose 1,5-bisphospate carboxylase/oxygenase (RuBisCO) is involved in the determination of CO2/O2 relative specificity in cyanobacterial RuBisCOs. Enzymatic analysis of metanogenic archaeal RuBisCO revealed that this enzyme showed the most lowest CO2/O2 relative specificity among RuBisCOs. We identified RuBisCO activase which catalyzes the activation of this enzyme in cyanobacteria.

  Competitive research funding


• 「光合成CO2固定酵素ルビスコのO2反応性の分子機構解析」

  公益財団法人 木下記念事業団, 木下基礎科学研究基金助成, 2019 - 2019, Coinvestigator


• ALCA「糖質バイオマスからグリコール酸ポリマーを合成する微生物プロセスの開発」

  国立研究開発法人 科学技術振興機構, 先端的低炭素化技術開発事業・戦略的創造研究推進事業（ALCA）先端的低炭素化技術開発 特別重点技術領域 「ホワイトバイオテクノロジーによる次世代化成品創出」, 2017 - 2018, Coinvestigator


• バイオジェット燃料生産技術開発事業「高速増殖型ボツリオコッカスを使ったバイオジェット燃料生産一貫プロセスの開発」

  国立研究開発法人 新エネルギー・産業技術総合開発機構, バイオジェット燃料生産技術開発事業, 2017 - 2018, Coinvestigator


• Limit break of photosynthesis by improvement of RuBisCO functions

  Ashida Hiroki

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2014 - 31 Mar. 2017, Principal investigator

  We found methanogenic archaeal RuBisCO functions in the novel CO2 fixation pathway which has some different steps from the photosynthetic Calvin cycle, suggesting that this novel pathway should be the ancient Calvin cycle. Enzymatic analysis of hybrid RuBisCO created by swap of large and small subunits between thermophilic cyanobacteria RuBisCO with high CO2 specificity and mesophilic cyanobacteria RuBisCO revealed that small subunit was involved in CO2 specificity. Transplastomic tobacco with over expression of RuBisCO activase tends to be enhanced a photosynthetic CO2 fixation rate.

  Competitive research funding


• CREST「シンク／ソース同時改良による植物生産性強化の基盤開発」

  独立行政法人 科学技術振興機構, CREST「二酸化炭素資源化を目指した植物の物質生産力強化と生産物活用のための基盤技術の創出」, 2012 - 2017, Coinvestigator not use grants


• 「C3型からC4型光合成植物への進化過程におけるCO2濃縮機能獲得に伴うRuBisCOの 機能発現機構の解析」

  文部科学省, 科学技術人材育成費補助事業 女性研究者研究活動支援事業（連携型）, 2016 - 2016, Coinvestigator


• CREST「海洋性アーキアの代謝特性の強化と融合によるエネルギー生産」

  国立研究開発法人 科学技術振興機構, 戦略的創造研究推進事業CREST, 2014 - 2015, Coinvestigator


• 植物遺伝子機能の解明とエネルギー植物育種への高度利用

  日産財団, 日産財団環境研究助成, 2011 - 2014, Coinvestigator not use grants


• さきがけ「バイオ燃料高生産のための炭素固定能を強化したスーパーシアノバクテリアの創成」

  蘆田 弘樹

  戦略的創造研究推進事業 個人型研究さきがけ, 2013, Principal investigator

  Competitive research funding


• ALCA「イモ革命による持続的低炭素化地球生活の実現」

  独立行政法人 科学技術振興機構, 先端的低炭素化技術開発事業ALCA, 2010 - 2012, Coinvestigator not use grants


• Molecular basis of productivity improvement through sink development of potato

  YOKOTA Akiho, AKASHI Kinya, ASHIDA Hiroki, MUNEKAGE Yuri

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Nara Institute of Science and Technology, 2009 - 2011

  This study was done to clarify the mechanism of promotion of photosynthesis in the source organ and accumulation of starch in the sink organ in potato plants. The gene was a member of the RanGTPase family. We established the in vitro stolon induction system using potato expalnts with axillary buds to analyze the expression of two RanGTPase genes. The results showed clearly that one of the two endogenous genes was exclusively induced in the initial phase of the stolon induction.


• Enhancement of plant photosynthesis by functional improvement of CO_2-fixing enzyme RuBisCO.

  ASHIDA Hiroki

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A), Grant-in-Aid for Young Scientists (A), Nara Institute of Science and Technology, 2009 - 2011

  Residues for functional improvement of RuBisCO were identified by the results form studies of thermophilic cyanobacterial RuBisCO and RuBisCO ancestral protein from Bacillus. I found a pre-Calvin cycle for CO_2 fixation using RuBisCO in methanogenic archaeon. Improvement of plant RuBisCO by replacement with red-algal residue enabled to perform a normal photosynthetic CO_2-fixing with low RuBisCO level in tobacco. The genes necessary for the achievement of RuBisCO accumulation were identified for quantitative enhancement of RuBisCO to increase photosynthetic capacity.


• 植物環境応答機能を利用した樹木炭酸ガス吸収能拡大

  日産科学振興財団, 日産科学振興財団助成, 2008 - 2010, Coinvestigator not use grants


• 「医・農・工融合によるヒトチオレドキシン１産生レタスの生産技術の開発」

  経済産業省, 植物機能を活用した高度モノ作り基盤技術開発／植物利用高付加価値物質製造基盤技術開発, 2006 - 2010, Coinvestigator not use grants


• Improvement of CO2-fixing enzyme, RuBisCO, based on molecular evolution to enhance photosynthesis of plant.

  ASHIDA Hiroki

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A), Grant-in-Aid for Young Scientists (A), Nara Institute of Science and Technology, 2006 - 2008

  ルビスコ祖先タンパク質とルビスコの比較解析から、両酵素で共通な触媒残基を明らかにした。これを基に祖先タンパク質にルビスコ触媒必須残基を導入し、試験管内でルビスコへの分子進化に成功した。紅藻ルビスコが持つ高CO_2識別残基をラン藻ルビスコに導入し、CO_2識別能を20%高めることに成功した。さらに、この残基をタバコルビスコに導入したタバコ形質転換体を作出した。紅藻ルビスコ遺伝子導入タバコの解析から、高機能外来性ルビスコの葉緑体機能発現の問題点を明らかにし、その解決策を導き出した。


• Molecular mechanism of functions of photosynthetic CO_2-fixing enzyme RuBisCO

  YOKOTA Akiho, AKASHI Kinya, ASHIDA Hiroki, MUNEKAGE Yuri

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Nara Institute of Science and Technology, 2005 - 2008

  ルビスコの反応触媒の分子機構およびルビスコ生合成の制御機構の解明を行ってきた.ルビスコ反応触媒の分子機構の解明を目指し、すでに枯草菌に発見しているルビスコ活性を持たないルビスコ祖先蛋白質とルビスコの反応中心残基の触媒反応への関わり方を明らかにした.我々が発見したもっとも高いSrel値を持つ紅藻Galdieriaルビスコと植物ルビスコの蛋白質構造比較から、オキシゲナーゼ反応抑制残基と想定している残基をラン藻ルビスコへ導入し、その機能を明らかにした.ルビスコ生合成の制御機構に関しては、ルビスコを正常に合成できない変異株を多数スクリーニングし、分子遺伝学手法によってそれらの変異原因遺伝子を特定し、その機能解析からルビスコ生合成の制御機構を明らかにした.


• 樹木の光合成促進を目指した基礎研究：CO2固定酵素ルビスコの機能改良

  日産科学振興財団, 日産科学振興財団助成, 2005 - 2007, Coinvestigator not use grants


• 分子進化に基づいたRuBisCOの改良

  補助金, 2005

  光合成カルビンサイクルにおいてCO2固定反応を触媒しているのが、ribulose bisphosphate carbaxylase/oxygenase (RuBisCO)である。RuBisCOはCO2とだけでなくO2との反応（オキシゲナーゼ反応）を示し、オキシゲナーゼ反応はカルボキシラーゼ反応を拮抗的に阻害する。また、RuBisCOの反応速度は一般の酵素と比較し、非常に遅く、その速度は1秒間に２〜３回である。これらの理由から、植物光合成はRuBisCOによって律速されている。このような現状から、O2との反応性を抑制し、反応速度を高めたRuBisCOを創成し、植物内で機能させることによる光合成CO2固定の促進が期待されている。私の研究テーマは、理想型のRuBisCOへの機能改良である。

  Competitive research funding


• 植物光合成改良・光合成CO2固定酵素改良

  ライフサイエンス基礎科学研究, 2005

  光合成CO2固定酵素の改良を行い、植物光合成効率の向上を目指す

  Competitive research funding