Abstract
Bacteriorhodopsin (bR) is a light-harvesting energy-transducing pigment so far found only in Halobacterium halobium, prokaryotes that occur in natural brines where the NaCl concentration is at or near saturation.1 Its chromophore, retinal (vitamin A aldehyde), is bound via protonated Schiff base linkage to the e group of a lysine-216 residue in the 26,000-mol wt. protein.2
© 1990 Optical Society of America
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