6VU5

Structure of G-alpha-q bound to its chaperone Ric-8A


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structures of G alpha Proteins in Complex with Their Chaperone Reveal Quality Control Mechanisms.

Seven, A.B.Hilger, D.Papasergi-Scott, M.M.Zhang, L.Qu, Q.Kobilka, B.K.Tall, G.G.Skiniotis, G.

(2020) Cell Rep 30: 3699-3709.e6

  • DOI: 10.1016/j.celrep.2020.02.086
  • Primary Citation of Related Structures:  
    6VU5, 6VU8

  • PubMed Abstract: 
  • Many chaperones promote nascent polypeptide folding followed by substrate release through ATP-dependent conformational changes. Here we show cryoEM structures of Gα subunit folding intermediates in complex with full-length Ric-8A, a unique chaperone-clie ...

    Many chaperones promote nascent polypeptide folding followed by substrate release through ATP-dependent conformational changes. Here we show cryoEM structures of Gα subunit folding intermediates in complex with full-length Ric-8A, a unique chaperone-client system in which substrate release is facilitated by guanine nucleotide binding to the client G protein. The structures of Ric-8A-Gα i and Ric-8A-Gα q complexes reveal that the chaperone employs its extended C-terminal region to cradle the Ras-like domain of Gα, positioning the Ras core in contact with the Ric-8A core while engaging its switch2 nucleotide binding region. The C-terminal α5 helix of Gα is held away from the Ras-like domain through Ric-8A core domain interactions, which critically depend on recognition of the Gα C terminus by the chaperone. The structures, complemented with biochemical and cellular chaperoning data, support a folding quality control mechanism that ensures proper formation of the C-terminal α5 helix before allowing GTP-gated release of Gα from Ric-8A.


    Organizational Affiliation

    Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA 94305, USA; Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305, USA. Electronic address: yiorgo@stanford.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Resistance to inhibitors of cholinesterase-8A (Ric-8A) A482Rattus norvegicusMutation(s): 0 
Gene Names: Ric8a
Find proteins for Q80ZG1 (Rattus norvegicus)
Explore Q80ZG1 
Go to UniProtKB:  Q80ZG1
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(q) subunit alpha B359Homo sapiensMutation(s): 0 
Gene Names: GNAQGAQ
Find proteins for P50148 (Homo sapiens)
Explore P50148 
Go to UniProtKB:  P50148
NIH Common Fund Data Resources
PHAROS:  P50148
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
AL-PEPTIDE LINKINGC3 H8 N O6 PSER
TPO
Query on TPO
AL-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesNS092695

Revision History 

  • Version 1.0: 2020-03-18
    Type: Initial release
  • Version 1.1: 2020-03-25
    Changes: Database references