Distribution of Fallover in the Carboxylase Reaction and Fallover-Inducible Sites among Ribulose 1, 5-Bisphosphate Carboxylase/Oxygenases of Photosynthetic Organisms

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概要

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• The biphasic reaction course, fallover, of carboxylation catalysed by ribulose 1, 5-bisphosphate carboxylase/oxygenase (RuBisCO) has been known as a characteristic of the enzyme from higher land plants. Fallover consists of hysteresis in the reaction seen during the initial several minutes and a very slow suicide inhibition by inhibitors formed from the substrate ribulose-1, 5-bisphosphate (RuBP). This study examined the relationship between occurrence of fallover and non-catalytic RuBP-binding sites, and the putative hysteresis-inducible sites (Lys-21 and Lys-305 of the large subunit in spinach RuBisCO) amongst RuBisCOs of a wide variety of photosynthetic organisms. Fallover could be detected by following the course of the carboxylase reaction at 1 mM RuBP and the non-catalytic binding sites by alleviation of fallover at 5 mM RuBP. RuBisCO from Euglena gracilis showed the same linear reaction course at both RuBP concentrations, indicating an association between an absence of fallover and an absence of the non-catalytic binding sites. This was supported by the results of an equilibrium binding assay for this enzyme with a transition state analogue. Green macroalgae and non-green algae contained the plant-type, fallover enzyme. RuBisCOs from Conjugatae, Closterium ehrenbergii, Gonatozygon monotaenium and Netrium digitus, showed a much smaller decrease in activity at 1 mM RuBP than the spinach enzyme and the reaction courses of these enzymes at 5 mM RuBP were almost linear. RuBisCO of a primitive type Conjugatae, Mesotaenium caldariorum, showed the same linear course at both RuBP concentrations. Sequencing of rbcL of these organisms indicated that Lys-305 was changed into arginine with Lys-21 conserved.

• 日本植物生理学会の論文

著者

• Tokai Hiroshi

  Plant Molecular Physiology Research Institute Of Innovative Technology For The Earth (rite)

• Hibino T

  Meijo Univ. Aichi Jpn

• Yokota A

  Nara Inst. Of Sci. And Technol. (naist) Nara Jpn

• Yokota Akiho

  Plant Molecular Physiology Research Institute Of Innovative Technology For The Earth (rite)

• Yokota Akiho

  Plant Mol.phys.lab. Rite

• Uemura Koichi

  Plant Molecular Physiology Research Institute Of Innovative Technology For The Earth (rite)

• Uemura Koichi

  Plant Moiecular Physiology Laboratory Research Institute Of Innovative Technology For The Earth(rite

• Uemura Koichi

  Plant Molecular Physiology Laboratory Research Institute Of Innovative Technology For The Earth (rit

• Yokota A

  Plant Molecular Physiology Research Institute Of Innovative Technology For The Earth (rite)

• HIGUCHI Takashi

  Plant Molecular Physiology, Research Institute of Innovative Technology for the Earth (RITE)

• Hamada Jin

  School Of Medicine Toyama Medical And Pharmaceutical University

• Tokai Hiroshi

  Department of Agricultural Chemistry, University of Osaka Prefecture

• Murayama Hiroshi

  Plant Molecular Physiology Laboratory, Research Institute of Innovative Technology for the Earth (RI

• Yamamoto Hiroshi

  Plant Molecular Physiology Laboratory, Research Institute of Innovative Technology for the Earth (RI

• Enomoto Yukito

  Marine Biology Station, Faculty of Science, Kobe University

• Fujiwara Shoko

  National Institute of Bioscience and Human Technology, Agency of Industrial Science and Technology

• Hamada Jin

  Department of Community Medicine, Faculty of Medicine, Toyama Medical and Pharmaceutical University

• UEMURA Koichi

  RITE

• Enomoto Yoshihisa

  Marine Biology Station Faculty Of Science Kobe University

• Higuchi Tatsuji

  Laboratory Of Biochemistry Graduate School Of Bioagricultural Sciences Nagoya University

• Fujiwara Shoko

  National Institute Of Bioscience And Human Technology Agency Of Industrial Science And Technology:(p

• Higuchi Takashi

  Plant Molecular Physiology Research Institute Of Innovative Technology For The Earth (rite)

• Tokai Hiroshi

  Department Of Agricultural Chemistry University Of Osaka Prefecture

• Enomoto Yukito

  Marine Biology Station Faculty Of Science Kobe University

• Yokota Akiho

  Plant Moiecular Physiology Laboratory Research Institute Of Innovative Technology For The Earth(rite

• Murayama Hiroshi

  Plant Molecular Physiology Laboratory Research Institute Of Innovative Technology For The Earth (rit

• Yamamoto Hiroshi

  Plant Molecular Physiology Laboratory Research Institute Of Innovate Technology For The Earth (rite)

• Yamamoto Hiroshi

  Plant Molecular Physiology Laboratory Research Institute Of Innovative Technology For The Earth (rit

• Hamada Jin

  Department Of Community Medicine Faculty Of Medicine Toyama Medical And Pharmaceutical University

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