Ontology highlight
ABSTRACT:
SUBMITTER: Kawakami K
PROVIDER: S-EPMC2688974 | biostudies-literature | 2009 May
REPOSITORIES: biostudies-literature
Kawakami Keisuke K Umena Yasufumi Y Kamiya Nobuo N Shen Jian-Ren JR
Proceedings of the National Academy of Sciences of the United States of America 20090511 21
The chloride ion, Cl(-), is an essential cofactor for oxygen evolution of photosystem II (PSII) and is closely associated with the Mn(4)Ca cluster. Its detailed location and function have not been identified, however. We substituted Cl(-) with a bromide ion (Br(-)) or an iodide ion (I(-)) in PSII and analyzed the crystal structures of PSII with Br(-) and I(-) substitutions. Substitution of Cl(-) with Br(-) did not inhibit oxygen evolution, whereas substitution of Cl(-) with I(-) completely inhib ...[more]