期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 115, 期 10, 页码 2383-2388出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1721896115
关键词
rhodopsin; GPCR; G protein; pulsed dipolar spectroscopy
资金
- NIH [R01EY05216]
- Canada Excellence Research Chairs program
- Canadian Institute for Advanced Research
- Anne and Max Tanenbaum Chair in Neuroscience
- Jules Stein Professor Endowment
- Biomedical Informatics Training Grant postdoctoral fellowship [T15-LM007033-33]
- National Eye Institute Core [P30EY00331]
- National Science Foundation Graduate Research Fellowship
- NATIONAL EYE INSTITUTE [R01EY005216, P30EY000331] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [T32GM008294] Funding Source: NIH RePORTER
- NATIONAL LIBRARY OF MEDICINE [T15LM007033] Funding Source: NIH RePORTER
More than two decades ago, the activation mechanism for the membrane-bound photoreceptor and prototypical G protein-coupled receptor (GPCR) rhodopsin was uncovered. Upon light-induced changes in ligand-receptor interaction, movement of specific transmembrane helices within the receptor opens a crevice at the cytoplasmic surface, allowing for coupling of heterotrimeric guanine nucleotide-binding proteins (G proteins). The general features of this activation mechanism are conserved across the GPCR superfamily. Nevertheless, GPCRs have selectivity for distinct G-protein family members, but the mechanism of selectivity remains elusive. Structures of GPCRs in complex with the stimulatory G protein, Gs, and an accessory nanobody to stabilize the complex have been reported, providing information on the intermolecular interactions. However, to reveal the structural selectivity filters, it will be necessary to determine GPCR-G protein structures involving other G-protein subtypes. In addition, it is important to obtain structures in the absence of a nanobody that may influence the structure. Here, we present a model for a rhodopsin-G protein complex derived from intermolecular distance constraints between the activated receptor and the inhibitory G protein, Gi, using electron paramagnetic resonance spectroscopy and spin-labeling methodologies. Molecular dynamics simulations demonstrated the overall stability of the modeled complex. In the rhodopsin-Gi complex, Gi engages rhodopsin in a manner distinct from previous GPCR-Gs structures, providing insight into specificity determinants.
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