MBP-fusion protein of transducin-alpha residues 327-350

Experimental Data Snapshot

  • Resolution: 1.75 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.158 

wwPDB Validation   3D Report Full Report

This is version 3.0 of the entry. See complete history


Structural underpinnings of Ric8A function as a G-protein alpha-subunit chaperone and guanine-nucleotide exchange factor.

Srivastava, D.Gakhar, L.Artemyev, N.O.

(2019) Nat Commun 10: 3084-3084

  • DOI: https://doi.org/10.1038/s41467-019-11088-x
  • Primary Citation of Related Structures:  
    6N84, 6N85, 6N86

  • PubMed Abstract: 

    Resistance to inhibitors of cholinesterase 8A (Ric8A) is an essential regulator of G protein α-subunits (Gα), acting as a guanine nucleotide exchange factor and a chaperone. We report two crystal structures of Ric8A, one in the apo form and the other in complex with a tagged C-terminal fragment of Gα. These structures reveal two principal domains of Ric8A: an armadillo-fold core and a flexible C-terminal tail. Additionally, they show that the Gα C-terminus binds to a highly-conserved patch on the concave surface of the Ric8A armadillo-domain, with selectivity determinants residing in the Gα sequence. Biochemical analysis shows that the Ric8A C-terminal tail is critical for its stability and function. A model of the Ric8A/Gα complex derived from crosslinking mass spectrometry and molecular dynamics simulations suggests that the Ric8A C-terminal tail helps organize the GTP-binding site of Gα. This study lays the groundwork for understanding Ric8A function at the molecular level.

  • Organizational Affiliation

    Department of Molecular Physiology and Biophysics, University of Iowa Carver College of Medicine, Iowa City, IA, 52242, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Maltose/maltodextrin-binding periplasmic protein,Guanine nucleotide-binding protein G(t) subunit alpha-2415Escherichia coli O157:H7Homo sapiens
This entity is chimeric
Mutation(s): 7 
Gene Names: malEZ5632ECs5017GNAT2GNATC
UniProt & NIH Common Fund Data Resources
Find proteins for P0AEX9 (Escherichia coli (strain K12))
Explore P0AEX9 
Go to UniProtKB:  P0AEX9
Find proteins for P19087 (Homo sapiens)
Explore P19087 
Go to UniProtKB:  P19087
PHAROS:  P19087
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP0AEX9P19087
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G07411ON
GlyCosmos:  G07411ON
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Resolution: 1.75 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.158 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.07α = 90
b = 83.07β = 90
c = 109.229γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Eye Institute (NIH/NEI)United StatesNIH R01 EY12682

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-10
    Type: Initial release
  • Version 1.1: 2019-07-24
    Changes: Data collection, Database references
  • Version 1.2: 2019-12-11
    Changes: Author supporting evidence
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2023-10-11
    Changes: Data collection, Database references, Refinement description, Structure summary
  • Version 3.0: 2024-01-10
    Changes: Advisory, Atomic model, Database references, Derived calculations, Polymer sequence, Source and taxonomy, Structure summary