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Photosynth Res. 2012 Feb;110(3):177-84. doi: 10.1007/s11120-011-9714-5. Epub 2011 Dec 21.

Sequence variation at the oxygen-evolving centre of photosystem II: a new class of 'rogue' cyanobacterial D1 proteins.

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Division of Molecular Biosciences, Imperial College, Exhibition Road, London, SW7 2AZ, UK.


Photosystem II is the oxygen-evolving enzyme of photosynthesis. It is a membrane-bound protein-pigment complex. The oxygen is produced at the oxygen-evolving centre (OEC), a Mn(4)CaO(5) metallocluster, which is largely ligated by amino acids of the D1 protein. The OEC-ligating residues are invariant between most cyanobacteria and higher plants. In this study, a new class of cyanobacterial D1 proteins has been identified in which the OEC metal-ligating residues are very different to the consensus. This new class of 'rogue' D1 proteins is associated with diazotrophic cyanobacteria. Their function, activity and origins are discussed.

[Indexed for MEDLINE]

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