Differential dynamics in the G protein-coupled receptor rhodopsin revealed by solution NMR.
basic_science · Level V
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- Record sourced from PubMed, PMID 14990789.
- Also identified by PMC identifier 373475.
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Abstract
G protein-coupled receptors are cell-surface seven-helical membrane proteins that undergo conformational changes on activation. The mammalian photoreceptor, rhodopsin, is the best-studied member of this superfamily. Here, we provide the first evidence that activation in rhodopsin may involve differential dynamic properties of side-chain versus backbone atoms. High-resolution NMR studies of alpha-(15)N-labeled receptor revealed large backbone motions in the inactive dark state. In contrast, indole side-chain (15)N groups of tryptophans showed well resolved, equally intense NMR signals, suggesting restriction to a single specific conformation.
Medical subject headings
- Rhodopsin