Investigating the photoprotective role of cytochrome b-559 in photosystem II in a mutant with altered ligation of the haem
Plant and Cell Physiology, ISSN: 1471-9053, Vol: 55, Issue: 7, Page: 1276-1285
2014
- 20Citations
- 30Captures
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Metrics Details
- Citations20
- Citation Indexes20
- 20
- CrossRef13
- Captures30
- Readers30
- 30
Article Description
Despite many years of study, the physiological role of cytochrome b-559 (Cyt b-559) within the photosystem II (PSII) complex still remains unclear. Here we describe the analysis of a mutant of the green alga Chlamydomonas reinhardtii in which the His ligand to the haem, provided by the alpha subunit, has been replaced by a Cys residue. The mutant is unable to grow photoautotrophically but can assemble oxygen-evolving PSII supercomplexes to 15-20% of the levels found in the wild-type control. Haem is still detected in the isolated PSII supercomplexes but at sub-stoichiometric levels consistent with weaker binding to the mutated cytochrome. Analysis of PSII activity in cells indicates slowed electron transfer in the mutant between plastoquinones Q and Q. We show that PSII activity in the mutant is more sensitive to chronic photoinhibition than the WT control because of two effects: a faster rate of damage and an impaired PSII repair cycle at the level of synthesis and/or incorporation of D1 into PSII. We also demonstrate that Cyt b-559 plays a role during the critical stage of assembling the Mn CaO cluster. Overall we conclude that Cyt b-559 optimises electron transfer on the acceptor side of PSII and plays physiologically important roles in the assembly, repair and maintenance of the complex. © 2014 The Author 2014.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84904012695&origin=inward; http://dx.doi.org/10.1093/pcp/pcu070; http://www.ncbi.nlm.nih.gov/pubmed/24850839; https://academic.oup.com/pcp/article-lookup/doi/10.1093/pcp/pcu070; https://dx.doi.org/10.1093/pcp/pcu070; https://academic.oup.com/pcp/article-abstract/55/7/1276/2756483?redirectedFrom=fulltext
Oxford University Press (OUP)
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