Energy-Dependent Regulation of Cyanobacterial and Chloroplast ATP Synthase
Cyanobacteria are prokaryotes with a high degree of structural and functional similarity to chloroplasts concerning the composition of their photosynthetic membranes (thy-lakoids ). This paper will deal with structure-function relations concerning the activity regulation of the ATP synthase, the terminal enzyme of photosynthetic and respiratory phosphorylation. The overall structure of the ATP synthase is essentially the same among various species. ATP synthesis and hydrolysis are catalysed by the F? part (Figure 1) and are linked to the transmembrane transport of protons catalysed by the F0 part, dissipating or generating a transmembrane proton gradient, respectively. The physiological role of cyanobacterial and chloroplast ATP synthase is primarily to make ATP; several mechanisms are present to prevent ATP hydrolysis as a waste of energy. In thylakoids from cyanobacteria several enzyme complexes, such as the ATP synthase, are shared for photosynthesis and respiration  and this has implications for its regulation
KeywordsHydrolysis Sulfide Cysteine Respiration Serine
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