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. 1988 Nov;85(22):8459–8463. doi: 10.1073/pnas.85.22.8459

Cysteine residues 110 and 187 are essential for the formation of correct structure in bovine rhodopsin.

S S Karnik 1, T P Sakmar 1, H B Chen 1, H G Khorana 1
PMCID: PMC282477  PMID: 3186735

Abstract

To investigate the role of different cysteine residues in bovine rhodopsin, a series of mutants were prepared in which the cysteine residues were systematically replaced by serines. The mutant genes were expressed in monkey kidney cells (COS-1) and the mutant opsins were evaluated for their levels of expression, glycosylation patterns, and ability to form the chromophore characteristic of rhodopsin and to activate transducin. Substitution of the three cytoplasmic cysteines (Cys-316, Cys-322, and Cys-323) and the four membrane-embedded cysteines (Cys-140, Cys-167, Cys-222, and Cys-264) produced proteins with wild-type phenotype. Also, single substitutions of Cys-185 gave rise to a wild-type phenotype. In contrast, substitution of the three intradiscal cysteines (Cys-110, Cys-185, and Cys-187) or single substitution of Cys-110 or Cys-187 gave proteins that were expressed at reduced levels, glycosylated abnormally, and unable to bind 11-cis-retinal. Thus, of the 10 cysteines in bovine rhodopsin, only intradiscal Cys-110 and Cys-187 are essential for the correct tertiary structure of the protein.

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Selected References

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