1mf6

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spinqualitylabelsall models PDB ID 1mf6 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image
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Transducin gamma subunit, C-terminal domain 60-71, rhodopsin-bound state: Ensemble of 15 models determined by TrNOE spectroscopy

Overview

Rhodopsin, a prototypical G protein-coupled receptor, catalyzes the activation of a heterotrimeric G protein, transducin, to initiate a visual signaling cascade in photoreceptor cells. The betagamma subunit complex, especially the C-terminal domain of the transducin gamma subunit, Gtgamma(60-71)farnesyl, plays a pivotal role in allosteric regulation of nucleotide exchange on the transducin alpha subunit by light-activated rhodopsin. We report that this domain is unstructured in the presence of an inactive receptor but forms an amphipathic helix upon rhodopsin activation. A K65E/E66K charge reversal mutant of the gamma subunit has diminished interactions with the receptor and fails to adopt the helical conformation. The identification of this conformational switch provides a mechanism for active GPCR utilization of the betagamma complex in signal transfer to G proteins.

About this Structure

1MF6 is a Single protein structure of sequence from Bos taurus. Full crystallographic information is available from OCA.

Reference

Rhodopsin controls a conformational switch on the transducin gamma subunit., Kisselev OG, Downs MA, Structure. 2003 Apr;11(4):367-73. PMID:12679015

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