Role of a novel photosystem II‐associated carbonic anhydrase in photosynthetic carbon assimilation in Chlamydomonas reinhardtii

FEBS Letters

Rojdestvenski, Igor³  Samuelsson, Göran³  Pronina, Natalia¹  Klimov, Viacheslav²  Karlsson, Jan³  Öquist, Gunnar³  Park, Youn-Il⁴ 

[1] Institute of Plant Physiology, Russian Academy of Sciences, Moscow 127276, Russia;Institute of Soil Science and Photosynthesis, Russian Academy of Sciences, Pushchino 142292, Russia;Department of Plant Physiology, Umeå University, Umeå 90187, Sweden;Department of Biology, Chungnam National Univeristy, Taejon 305764, South Korea

关键词: Carbonic anhydrase;    Photosystem II;    Chlamydomonas reinhardtii;    Carbon concentration mechanism;   

DOI  :  10.1016/S0014-5793(99)00037-X

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Intracellular carbonic anhydrases (CA) in aquatic photosynthetic organisms are involved in the CO₂-concentrating mechanism (CCM), which helps to overcome CO₂ limitation in the environment. In the green alga Chlamydomonas reinhardtii, this CCM is initiated and maintained by the pH gradient created across the chloroplast thylakoid membranes by photosystem (PS) II-mediated electron transport. We show here that photosynthesis is stimulated by a novel, intracellular α-CA bound to the chloroplast thylakoids. It is associated with PSII on the lumenal side of the thylakoid membranes. We demonstrate that PSII in association with this lumenal CA operates to provide an ample flux of CO₂ for carboxylation.

【 授权许可】

Unknown