pharaonis phoborhodopsin (ppR; also called pharaonis sensory rhodopsin II, psRII) is a photoreceptor for negative phototaxis in Natronobacterium pharaonis. ppR activates the cognate transducer protein, pHtrII, upon absorption of light. ppR and pHtrII form a tight 2:2 complex in the unphotolyzed state, and the interaction is somehow altered during the… (More)
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