1GDD

TERTIARY AND QUATERNARY STRUCTURAL CHANGES IN GIA1 INDUCED BY GTP HYDROLYSIS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.214 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Tertiary and quaternary structural changes in Gi alpha 1 induced by GTP hydrolysis.

Mixon, M.B.Lee, E.Coleman, D.E.Berghuis, A.M.Gilman, A.G.Sprang, S.R.

(1995) Science 270: 954-960


  • PubMed Abstract: 
  • Crystallographic analysis of 2.2 angstrom resolution shows that guanosine triphosphate (GTP) hydrolysis triggers conformational changes in the heterotrimeric G-protein alpha subunit, Gi alpha 1. The switch II and switch III segments become disordered ...

    Crystallographic analysis of 2.2 angstrom resolution shows that guanosine triphosphate (GTP) hydrolysis triggers conformational changes in the heterotrimeric G-protein alpha subunit, Gi alpha 1. The switch II and switch III segments become disordered, and linker II connecting the Ras and alpha helical domains moves, thus altering the structures of potential effector and beta gamma binding regions. Contacts between the alpha-helical and Ras domains are weakened, possibly facilitating the release of guanosine diphosphate (GDP). The amino and carboxyl termini, which contain receptor and beta gamma binding determinants, are disordered in the complex with GTP, but are organized into a compact microdomain on GDP hydrolysis. The amino terminus also forms extensive quaternary contacts with neighboring alpha subunits in the lattice, suggesting that multimers of alpha subunits or heterotrimers may play a role in signal transduction.


    Related Citations: 
    • Structures of Active Conformations of Gi Alpha 1 and the Mechanism of GTP Hydrolysis
      Coleman, D.E.,Berghuis, A.M.,Lee, E.,Linder, M.E.,Gilman, A.G.,Sprang, S.R.
      (1994) Science 265: 1405
    • Crystallization and Preliminary Crystallographic Studies of Gi Alpha 1 and Mutants of Gi Alpha 1 in the GTP and Gdp-Bound States
      Coleman, D.E.,Lee, E.,Mixon, M.B.,Linder, M.E.,Berghuis, A.M.,Gilman, A.G.,Sprang, S.R.
      (1994) J.Mol.Biol. 238: 630


    Organizational Affiliation

    Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas 75235-9050, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GI ALPHA 1
A
353Rattus norvegicusGene Names: Gnai1 (Gnai-1)
Find proteins for P10824 (Rattus norvegicus)
Go to UniProtKB:  P10824
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GDP
Query on GDP

Download SDF File 
Download CCD File 
A
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-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: 2.2 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.214 
  • Space Group: I 4
Unit Cell:
Length (Å)Angle (°)
a = 121.840α = 90.00
b = 121.840β = 90.00
c = 68.390γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
X-PLORrefinement
X-PLORphasing
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-11-27
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance