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Retinal dynamics underlie its switch from inverse agonist to agonist during rhodopsin activation.


ABSTRACT: X-ray and magnetic resonance approaches, though central to studies of G protein-coupled receptor (GPCR)-mediated signaling, cannot address GPCR protein dynamics or plasticity. Here we show that solid-state (2)H NMR relaxation elucidates picosecond-to-nanosecond-timescale motions of the retinal ligand that influence larger-scale functional dynamics of rhodopsin in membranes. We propose a multiscale activation mechanism whereby retinal initiates collective helix fluctuations in the meta I-meta II equilibrium on the microsecond-to-millisecond timescale.

SUBMITTER: Struts AV 

PROVIDER: S-EPMC5283944 | BioStudies | 2011-01-01

REPOSITORIES: biostudies

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