The oxygen-evolving Photosystem II complex of the chlorophyll-a b-containing prokaryote Prochlorothrix hollandica is similar to that of cyanobacteria in terms of the absence of the 23 kDa extrinsic polypeptide. In contrast to cyanobacteria and green chloroplasts, the manganese stabilizing protein (MSP) of Prochlorothrix is a hydrophobic protein as detected by Triton X-114 phase partitioning and has an apparent molecular mass of 37 kDa. The catalytic site of water oxidation in Prochlorothrix thylakoids is significantly more resistant to inhibition by hydroxylamine as compared with thylakoids of Chlamydomonas or Synechocystis 6803. These results indicate that the properties of the donor side of Photosystem II complex of Prochlorothrix differ from that of the related cyanobacteria.
- Manganese stabilizing protein
- Oxygen evolving complex
- Photosystem II
ASJC Scopus subject areas
- Cell Biology