Extrinsic proteins of photosystem II: an intermediate member of PsbQ protein family in red algal PS II.
作者： Hisataka Ohta , Takehiro Suzuki , Masaji Ueno , Akinori Okumura , Shizue Yoshihara
DOI: 10.1046/J.1432-1033.2003.03810.X
关键词:
摘要: The oxygen-evolving photosystem II (PS II) complex of red algae contains four extrinsic proteins 12 kDa, 20 33 kDa and cyt c-550, among which the protein is unique in that it not found other organisms. We cloned gene for 20-kDa from a alga Cyanidium caldarium. consists leader sequence can be divided into two parts: one transfer across plastid envelope thylakoid lumen, indicating encoded by nuclear genome. mature has low but significant homology with 17-kDa (PsbQ) PS green Volvox Carteri Chlamydomonas reinhardtii, as well PsbQ higher plants PsbQ-like cyanobacteria. Cross-reconstitution experiments combinations IIs Cy. caldarium Ch. reinhardtii showed was functional place algal on binding to restoration oxygen evolution. From these results, we conclude ancestral form plant IIs. This provides an important clue evolution prokaryotic cyanobacteria eukaryotic plants. coding named psbQ' (prime).
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