Photosensitive phosphoproteins in Halobacteria: regulatory coupling of transmembrane proton flux and protein dephosphorylation.

We conclude the protein ejection by bacteriorhodopsin, through an unknown coupling pathway, induces the LR protein dephosphorylation . A priori one expects two immediate consequences of proton ejection by bacteriorhodopsin: (a) an increase in internal pH (pH ; ,) (which may or may not be significant, depending on the cytoplasmic buffering capacity); and (b) an increase in membrane potential (04,), since proton ejection by bacteriorho- dopsin results in a net transfer of charge across the membrane.

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