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- W2183634321 abstract "Halorhodopsin fromHalobaceriwn halobium waspurified andreconstituted withlipids frompurple mem- branes. Theresulting protein-containing membranesheets wereadsorbed toaplanar lipid membrane andphotoelectric properties wereanalyzed. Depending onlight conditions, halorhodopsin acted either asalight-driven chloride pumpor asaproton pump:green light caused chloride transport and additional blue light induced proton pumping. Intheliving cell, bothofthese vectorial processes wouldbedirected toward the cytoplasm and,compared toiontransport bybacteriorho- dopsin, this isaninversed proton flow. Azide, acatalyst for reversible deprotonation ofhalorhodopsin, enhanced proton transport, andthedeprotonated Schiff baseinthe13-cis configuration (11410) wasidentified asthekeyintermediate of this alternative catalytic cycle inhalorhodopsin. While chloride transport inhalorhodopsin ismediated byaone-photon pro- cess, proton transport requires theabsorption oftwophotons: onephoton forformation ofH410andrelease ofaproton, and onephoton forphotoisomerization ofH410andre-formation of H578withconcomitant uptake ofaproton bytheSchiff base. Theretinal protein halorhodopsin occurs inthecell mem- brane ofHalobacterium halobium inaddition totheproton pumpbacteriorhodopsin" @default.
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- W2183634321 date "1993-01-01" @default.
- W2183634321 modified "2023-09-27" @default.
- W2183634321 title "Light-driven proton orchloride pumpingbyhalorhodopsin" @default.
- W2183634321 hasPublicationYear "1993" @default.
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