J. Biol. Chem., Vol. 266, Issue 7, 4269-4275, 03, 1991

Mapping of the amino acids in membrane-embedded helices that interact with the retinal chromophore in bovine rhodopsin

TA Nakayama and HG Khorana
Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.

By using a photoactivatable analog of 11-cis-retinal in rhodopsin, we have previously identified the amino acids Phe-115, Ala-117, Glu-122, Trp-126, Ser-127, and Trp-265 as major sites of cross-linking to the chromophore. To further investigate the amino acids that interact with retinal, we have now used site-directed mutagenesis to replace a variety of amino acids in the membrane-embedded helices in bovine rhodopsin, including those that were indicated by cross-linking studies. The mutant rhodopsin genes were expressed in monkey kidney cells (COS-1) and purified. The mutant proteins were studied for their spectroscopic properties and their ability to activate transducin. Substitution of the two amino acids, Trp-265 and Glu-122 by Tyr, Phe, and Ala and by Gln, Asp and Ala, respectively, resulted in blue-shifted (20-30 nm) chromophore, and substitution of Trp-265 by Ala resulted in marked reduction in the extent of chromophore regeneration. Light- dependent bleaching behavior was significantly altered in Ala-117---- Phe, Trp-265----Phe, Ala, and Ala-292----Asp mutants. Transducin activation was reduced in these mutants, in particular Trp-265 mutants, as well as in Glu-122----Gln, Trp-126----Leu (Ala), Pro-267----Ala (Asn, Ser), and Tyr-268----Phe mutants. These findings indicate that Trp-265 is located close to retinal and Glu-122, Trp-126, and probably Tyr-268 are also likely to be near retinal.
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