Processing of D1 Protein: A Mysterious Process Carried Out in Thylakoid Lumen

被引:22
作者
Inagaki, Noritoshi [1 ]
机构
[1] Natl Agr & Food Res Org NARO, Res Ctr Adv Anal, Tsukuba, Ibaraki 3058518, Japan
关键词
assembly; carboxyl-terminal extension; carboxyl-terminal processing protease (CtpA); D1 protein (psbA); Mn4CaO5 cluster (Mn-cluster); oxygen evolution; photosystem II (PSII); serine-lysine dyad; thylakoid lumen; water oxidation; II REACTION-CENTER; OPTIMAL PHOTOSYNTHETIC PERFORMANCE; METABOLIZED 32-KILODALTON PROTEIN; ENZYME-SUBSTRATE INTERACTION; CARBOXYL-TERMINAL EXTENSION; EVOLVING PHOTOSYSTEM-II; LOW-FLUORESCENT MUTANTS; TAIL-SPECIFIC PROTEASE; PRECURSOR PROTEIN; MEMBRANE-PROTEIN;
D O I
10.3390/ijms23052520
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
In oxygenic photosynthetic organisms, D1 protein, a core subunit of photosystem II (PSII), displays a rapid turnover in the light, in which D1 proteins are distinctively damaged and immediately removed from the PSII. In parallel, as a repair process, D1 proteins are synthesized and simultaneously assembled into the PSII. On this flow, the D1 protein is synthesized as a precursor with a carboxyl-terminal extension, and the D1 processing is defined as a step for proteolytic removal of the extension by a specific protease, CtpA. The D1 processing plays a crucial role in appearance of water-oxidizing capacity of PSII, because the main chain carboxyl group at carboxyl-terminus of the D1 protein, exposed by the D1 processing, ligates a manganese and a calcium atom in the Mn4CaO5-cluster, a special equipment for water-oxidizing chemistry of PSII. This review focuses on the D1 processing and discusses it from four angles: (i) Discovery of the D1 processing and recognition of its importance: (ii) Enzyme involved in the D1 processing: (iii) Efforts for understanding significance of the D1 processing: (iv) Remaining mysteries in the D1 processing. Through the review, I summarize the current status of our knowledge on and around the D1 processing.
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页数:21
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