6N84

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

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: 10.1038/s41467-019-11088-x
  • Primary Citation of Related Structures:  

  • 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 ...

    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 Biochemistry, University of Iowa Carver College of Medicine, Iowa City, IA, 52242, USA.,Department of Molecular Physiology and Biophysics, University of Iowa Carver College of Medicine, Iowa City, IA, 52242, USA. nikolai-artemyev@uiowa.edu.,Department of Molecular Physiology and Biophysics, University of Iowa Carver College of Medicine, Iowa City, IA, 52242, USA.,Protein Crystallography Facility, University of Iowa Carver College of Medicine, Iowa City, IA, 52242, USA.,Department of Ophthalmology and Visual Sciences, University of Iowa Carver College of Medicine, Iowa City, IA, 52242, USA. nikolai-artemyev@uiowa.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
G alpha t C terminal fragment fused to maltose binding protein
A
415Escherichia coli O157:H7Homo sapiens
This entity is chimeric
Mutation(s): 0 
Gene Names: malE, GNAT2 (GNATC)
Find proteins for P0AEY0 (Escherichia coli O157:H7)
Go to UniProtKB:  P0AEY0
Find proteins for P19087 (Homo sapiens)
Go to Gene View: GNAT2
Go to UniProtKB:  P19087
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MAL
Query on MAL

Download SDF File 
Download CCD File 
A
MALTOSE
C12 H22 O11
GUBGYTABKSRVRQ-ASMJPISFSA-N
 Ligand Interaction
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.157 
  • Space Group: P 63
Unit Cell:
Length (Å)Angle (°)
a = 83.070α = 90.00
b = 83.070β = 90.00
c = 109.229γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
PHASERphasing
XDSdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Eye InstituteUnited StatesNIH R01 EY12682

Revision History 

  • Version 1.0: 2019-07-10
    Type: Initial release
  • Version 1.1: 2019-07-24
    Type: Data collection, Database references