Protein phosphorylation and control of excitation energy transfer in photosynthetic purple bacteria and cyanobacteria.
The function of phosphorylation of light-harvesting polypeptides is well characterised in chloroplasts of green plants, but the prokaryotic cyanobacteria and purple photosynthetic bacteria have quite different light-harvesting polypeptides whose structure and function cannot be controlled in precisely the same way. Nevertheless, cyanobacteria show light-dependent phosphorylation of membrane polypeptides associated with photosystem II and with the light-harvesting phycobilisome, and purple bacteria show light-dependent phosphorylation of low molecular-weight chromatophore membrane polypeptides. In both cases membrane protein phosphorylation is associated with functional changes observed by chlorophyll fluorescence spectroscopy or chlorophyll fluorescence induction kinetics. Here we report on our recent protein sequence and other data concerning the identities of these phosphoproteins. We also discuss the significance of these findings for regulation by protein phosphorylation of photosynthesis in prokaryotes.
Allen
J F
JF
Department of Pure and Applied Biology, University of Leeds, UK.
Harrison
M A
MA
Holmes
N G
NG
D000458:Cyanobacteria / Q000378:metabolism*; D004735:Energy Transfer; D010750:Phosphoproteins / Q000378:metabolism*; D010766:Phosphorylation; D045524:Phycobilisomes; D012246:Rhodospirillum / Q000378:metabolism*
D010750:Phosphoproteins; D045524:Phycobilisomes