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• W2028291036 abstract "Previous work on the expression of bovine opsin fragments separated in the cytoplasmic region has allowed the identification of specific polypeptide segments that contain sufficient information to fold independently, insert into a membrane, and assemble to form a functional photoreceptor. To further examine the contributions of these and other polypeptide segments to the mechanism of opsin folding and assembly, we have constructed 20 additional opsin gene fragments where the points of separation occur in the intradiscal, transmembrane, and cytoplasmic regions. Nineteen of these fragments were stably expressed in COS-1 cells. A five-helix fragment was stably produced only after coexpression with its complementary two-helix fragment. Two fragments composed of the amino-terminal region and the first transmembrane helix were not N-glycosylated and were only partially membrane integrated. One of the singly expressed fragments, which is truncated after the retinal attachment site, bound 11-cis-retinal. Of the coexpressed complementary fragments, only those separated in the second intradiscal and third cytoplasmic regions formed noncovalently linked rhodopsins. Both of these pigments showed reduced transducin activation. Therefore, while many opsin fragments contain enough information to fold and insert into a membrane, only those separated at specific locations assemble to a retinal-binding opsin. Previous work on the expression of bovine opsin fragments separated in the cytoplasmic region has allowed the identification of specific polypeptide segments that contain sufficient information to fold independently, insert into a membrane, and assemble to form a functional photoreceptor. To further examine the contributions of these and other polypeptide segments to the mechanism of opsin folding and assembly, we have constructed 20 additional opsin gene fragments where the points of separation occur in the intradiscal, transmembrane, and cytoplasmic regions. Nineteen of these fragments were stably expressed in COS-1 cells. A five-helix fragment was stably produced only after coexpression with its complementary two-helix fragment. Two fragments composed of the amino-terminal region and the first transmembrane helix were not N-glycosylated and were only partially membrane integrated. One of the singly expressed fragments, which is truncated after the retinal attachment site, bound 11-cis-retinal. Of the coexpressed complementary fragments, only those separated in the second intradiscal and third cytoplasmic regions formed noncovalently linked rhodopsins. Both of these pigments showed reduced transducin activation. Therefore, while many opsin fragments contain enough information to fold and insert into a membrane, only those separated at specific locations assemble to a retinal-binding opsin." @default.
• W2028291036 created "2016-06-24" @default.
• W2028291036 creator A5008721821 @default.
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• W2028291036 date "1996-03-01" @default.
• W2028291036 modified "2023-10-18" @default.
• W2028291036 title "Examining Rhodopsin Folding and Assembly through Expression of Polypeptide Fragments" @default.
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• W2028291036 doi "https://doi.org/10.1074/jbc.271.13.7860" @default.
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