Fast electron transfer from cytochrome c6 and plastocyanin to photosystem I of Chlamydomonas reinhardtii requires PsaF

Biochemistry
Michael HipplerJ D Rochaix

Abstract

To study the function of the PsaF subunit of photosystem I (PSI), the interactions between plastocyanin or cytochrome c6 and PSI isolated from wild-type and a PsaF-deficient mutant of Chlamydomonas reinhardtii have been examined using cross-linking techniques and flash absorption spectroscopy. We show that efficient electron transfer from both plastocyanin and cytochrome c6 to PSI depends on PsaF. A remarkable feature of the PSI complex of C. reinhardtii is that both plastocyanin and cytochrome c6 reduce P700+ with first-order kinetics and a half-time of 3 micros, which is unique among photosynthetic organisms examined.

Citations

Jun 25, 2005·Photosynthesis Research·Ingo Grotjohann, Petra Fromme
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Oct 14, 2003·Eukaryotic Cell·Einar J StauberMichael Hippler
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May 5, 2005·Proceedings of the National Academy of Sciences of the United States of America·Giovanni FinazziMichael Hippler
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