Physiological and Biochemical Characterization of Three Nucleoside Diphosphate Kinase Isozymes from Rice (Oryza sativa L.)

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概要

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• Nucleoside diphosphate kinase (NDPK) is a ubiquitous enzyme that catalyzes the transfer of the γ-phosphoryl group from a nucleoside triphosphate to a nucleoside diphosphate. In this study, we examined the subcellular localization, tissue-specific gene expression, and enzymatic characteristics of three rice NDPK isozymes (OsNDPK1-OsNDPK3). Sequence comparison of the three OsNDPKs suggested differential subcellular localization. Transient expression of green fluorescence protein-fused proteins in onion cells indicated that OsNDPK2 and OsNDPK3 are localized to plastid and mitochondria respectively, while OsNDPK1 is localized to the cytosol. Expression analysis indicated that all the OsNDPKs are expressed in the leaf, leaf sheath, and immature seeds, except for OsNDPK1, in the leaf sheath. Recombinant OsNDPK2 and OsNDPK3 showed lower optimum pH and higher stability under acidic pH than OsNDPK1. In ATP formation, all the OsNDPKs displayed lower Km values for the second substrate, ADP, than for the first substrate, NTP, and showed lowest and highest Km values for GTP and CTP respectively.

• 社団法人 日本農芸化学会の論文
• 2011-09-23

著者

• 森 春英

  北海道大学大学院農学研究院応用生命科学部門

• Matsui Hirokazu

  Dept. Biosci. Chem. Fac. Agric. Hokkaido Univ.

• Matsui Hirokazu

  Laboratory Of Biochemistry Department Of Bioscience And Chemistry Faculty Of Agriculture Hokkaido Un

• Matsui Hirokazu

  Hokkaido Univ. Sapporo Jpn

• Hiraga Susumu

  Department Of Applied Biosciences Graduate School Of Agriculture Hokkaido University

• Ito H

  Division Of Applied Bioscience Graduate School Of Agriculture Hokkaido University

• Hamada Shigeki

  Laboratory Of Biochemistry Research Faculty Of Agriculture Hokkaido University

• Saburi Wataru

  Nihon Shokuhin Kako Co. Ltd.

• Matsui Hirokazu

  Laboratory Of Biochemistry Research Faculty Of Agriculture Hokkaido University

• WAKUTA Shinji

  Division of Applied Bioscience, Research Faculty of Agriculture, Hokkaido University

• Wakuta Shinji

  Division Of Applied Bioscience Research Faculty Of Agriculture Hokkaido University

• KIHARA Akihiko

  Laboratory of Biochemistry, Research Faculty of Agriculture, Hokkaido University

• SABURI Wataru

  Laboratory of Biochemistry, Research Faculty of Agriculture, Hokkaido University

• WAKUTA Shinji

  Laboratory of Biochemistry, Research Faculty of Agriculture, Hokkaido University

• KIM Myung-Hee

  Crop Cold-Tolerance Research Team, National Agricultural Research Center for The Hokkaido Region

• ITO Hiroyuki

  Laboratory of Biochemistry, Research Faculty of Agriculture, Hokkaido University

• IMAI Ryozo

  Crop Cold-Tolerance Research Team, National Agricultural Research Center for The Hokkaido Region

• Kim Myung-hee

  Crop Cold-tolerance Research Team National Agricultural Research Center For The Hokkaido Region

• Imai Ryozo

  National Agricultural Research Center For Hokkaido Region National Agriculture And Food Research Org

• Ito Hiroyuki

  Laboratory Of Biochemistry Research Faculty Of Agriculture Hokkaido University

• Kihara Akihiko

  Laboratory Of Biochemistry Research Faculty Of Agriculture Hokkaido University

• Ito Hiroyuki

  Laboratory Of Biochemistry Division Of Applied Bioscience Research Faculty For Agriculture Hokkaido University

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