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Photosynthetic Water Oxidation in Cytochromeb559Mutants Containing a Disrupted Heme-binding Pocket
Journal of Biological Chemistry
The role of cytochrome b 559 in photosynthetic oxygen evolution has been investigated in three chloroplast mutants of Chlamydomonas reinhardtii, in which one of the two histidine axial ligands to the heme, provided by the ␣ subunit, has been replaced by the residues methionine, tyrosine, and glutamine. Photosystem two complexes functional for oxygen evolution could be assembled in the methionine and tyrosine mutants up to ϳ15% of wild type levels, whereas no complexes with oxygen evolutiondoi:10.1074/jbc.m103935200 pmid:11390403 fatcat:djbb3pr2j5dsrlpa62szhktopi