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. 1991 Oct 15;88(20):9122–9126. doi: 10.1073/pnas.88.20.9122

Photosynthetic electron transport in genetically altered photosystem II reaction centers of chloroplasts.

R A Roffey 1, J H Golbeck 1, C R Hille 1, R T Sayre 1
PMCID: PMC52664  PMID: 1656461

Abstract

Using a cotransformation system to identify chloroplast transformants in Chlamydomonas reinhardtii, we converted histidine-195 of the photosystem II reaction center D1 protein to a tyrosine residue. The mutants were characterized by a reduced quantum efficiency for photosynthetic oxygen evolution, which varied in a pH-dependent manner, a reduced capacity to oxidize artificial donors to photosystem II, and P680+ reduction kinetics (microsecond) that were essentially similar to wild type. In addition, a dark-stable radical was detected by ESR in mutant photosystem II particles but not in wild-type particles. This radical was similar in g value and lineshape to chlorophyll or carotenoid cations but could have arisen from a tyrosine-195 cation. The ability of the photosystem II trap (P680+) to oxidize tyrosine residues suggests that the mutant tyrosine residue could be used as a redox-sensitive probe to investigate the environment around the photosystem II trap.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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