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Helix movement is coupled to displacement of the second extracellular loop in rhodopsin activation.

ABSTRACT: The second extracellular loop (EL2) of rhodopsin forms a cap over the binding site of its photoreactive 11-cis retinylidene chromophore. A crucial question has been whether EL2 forms a reversible gate that opens upon activation or acts as a rigid barrier. Distance measurements using solid-state (13)C NMR spectroscopy between the retinal chromophore and the beta4 strand of EL2 show that the loop is displaced from the retinal binding site upon activation, and there is a rearrangement in the hydrogen-bonding networks connecting EL2 with the extracellular ends of transmembrane helices H4, H5 and H6. NMR measurements further reveal that structural changes in EL2 are coupled to the motion of helix H5 and breaking of the ionic lock that regulates activation. These results provide a comprehensive view of how retinal isomerization triggers helix motion and activation in this prototypical G protein-coupled receptor.

SUBMITTER: Ahuja S 

PROVIDER: S-EPMC2705779 | biostudies-literature | 2009 Feb

REPOSITORIES: biostudies-literature

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Helix movement is coupled to displacement of the second extracellular loop in rhodopsin activation.

Ahuja Shivani S   Hornak Viktor V   Yan Elsa C Y EC   Syrett Natalie N   Goncalves Joseph A JA   Hirshfeld Amiram A   Ziliox Martine M   Sakmar Thomas P TP   Sheves Mordechai M   Reeves Philip J PJ   Smith Steven O SO   Eilers Markus M  

Nature structural & molecular biology 20090201 2

The second extracellular loop (EL2) of rhodopsin forms a cap over the binding site of its photoreactive 11-cis retinylidene chromophore. A crucial question has been whether EL2 forms a reversible gate that opens upon activation or acts as a rigid barrier. Distance measurements using solid-state (13)C NMR spectroscopy between the retinal chromophore and the beta4 strand of EL2 show that the loop is displaced from the retinal binding site upon activation, and there is a rearrangement in the hydrog  ...[more]

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