期刊
JOURNAL OF STRUCTURAL BIOLOGY
卷 176, 期 3, 页码 387-394出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jsb.2011.08.016
关键词
G protein-coupled receptor; Heterotrimeric G protein; Photoactivated rhodopsin; Scanning transmission electron microscopy; Transducin
资金
- National Institutes of Health, Foundation Fighting Blindness [EY008061, EY019718, GM079191, P30EY11373]
- Amgen Inc.
- Swiss National Foundation [3100A0-108299]
The process of vision is initiated when the G protein-coupled receptor, rhodopsin (Rho), absorbs a photon and transitions to its activated Rho* form. Rho* binds the heterotrimeric G protein, transducin (G(t)) inducing GDP to GTP exchange and G(t) dissociation. Using nucleotide depletion and affinity chromatography, we trapped and purified the resulting nucleotide-free Rho*.G(t) complex. Quantitative SDS-PAGE suggested a 2:1 molar ratio of Rho* to G(t) in the complex and its mass determined by scanning transmission electron microscopy was 221 +/- 12 kDa. A 21.6 angstrom structure was calculated from projections of negatively stained Rho*.G(t) complexes. The molecular envelope thus determined accommodated two Rho molecules together with one G(t) heterotrimer, corroborating the heteropentameric structure of the Rho*.G(t) complex. (C) 2011 Elsevier Inc. All rights reserved.
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