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Cited by 314

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Assembly of functional rhodopsin requires a disulfide bond between cysteine residues 110 and 187.

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Karnik, S S, Khorana, H G·1990·Journal of Biological Chemistry

Abstract

Cysteine residues 110 and 187 are essential for the formation of the correct bovine rhodopsin structure (Karnik, S. S., Sakmar, T. P., Chen, H.-B., and Khorana, H. G. (1988) Proc. Natl. Acad. Sci. U. S. A. 85, 8459-8463). We now show that the sulfhydryl groups of these 2 cysteine residues interact to form a disulfide bond. Rhodopsin mutants containing cysteine----serine substitutions were prepared as follows. In one mutant, CysVII, all the 10 cysteine residues of rhodopsin were replaced by serines. A second mutant, CysVIII, contained only C110 and C185; a third mutant, CysIX, contained only C185 and C187 while the fourth mutant, CysX, contained only C110 and C187. Only mutant CysX formed functional rhodopsin. Mutants CysVIII and CysIX reacted with [3H]iodoacetic acid showing the presence of free sulfhydryl groups while mutant CysX was inert to this reagent. CysX reacted with cyanide ion to form a thiocyanate derivative showing the presence of a disulfide bond. The C110-C187 disulfide bond is buried in rhodopsin because reactions with disulfide reducing agents and cyanide ion require prior treatment with denaturants.

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Metadata

Authors
Karnik, S. S., & Khorana, H. G.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1990-10
Volume
265
Issue
29
Pages
17520-17524
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1584684122
Cited by
314
References
21
FWCI
6.29
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: Assembly of functional rhodopsin requires a disulfide bond between cysteine residues 110 and 187. https://app.cochat.ai/papers/10.1016/s0021-9258(18)38195-x
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Karnik, S. S., & Khorana, H. G. (1990). Assembly of functional rhodopsin requires a disulfide bond between cysteine residues 110 and 187. Journal of Biological Chemistry. https://doi.org/10.1016/s0021-9258(18)38195-x

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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