1GIT

STRUCTURE OF GTP-BINDING PROTEIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the GDP-Pi complex of Gly203-->Ala gialpha1: a mimic of the ternary product complex of galpha-catalyzed GTP hydrolysis.

Berghuis, A.M.Lee, E.Raw, A.S.Gilman, A.G.Sprang, S.R.

(1996) Structure 4: 1277-1290


  • PubMed Abstract: 
  • G proteins play a vital role in transmembrane signalling events. In their inactive form G proteins exist as heterotrimers consisting of an alpha subunit, complexed with GDP and a dimer of betagamma subunits. Upon stimulation by receptors, G protein a ...

    G proteins play a vital role in transmembrane signalling events. In their inactive form G proteins exist as heterotrimers consisting of an alpha subunit, complexed with GDP and a dimer of betagamma subunits. Upon stimulation by receptors, G protein alpha subunits exchange GDP for GTP and dissociate from betagamma . Thus activated, alphasubunits stimulate or inhibit downstream effectors. The duration of the activated state corresponds to the single turnover rate of GTP hydrolysis, which is typically in the range of seconds. In Gialpha1, the Gly203-->Ala mutation reduces the affinity of the substrate for Mg2+, inhibits a key conformational step that occurs upon GTP binding and consequently inhibits the release of betagamma subunits from the GTP complex. The structure of the Gly203-->Ala mutant of Gialpha1 (G203AGialpha1) bound to the slowly hydrolyzing analog of GTP (GTPgammaS) has been determined in order to elucidate the structural changes that take place during hydrolysis.


    Related Citations: 
    • 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
    • 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
    • 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


    Organizational Affiliation

    Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75235-9050, USA. sprang@howie.swmed.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
G PROTEIN 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
PO4
Query on PO4

Download SDF File 
Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.186 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 77.100α = 90.00
b = 77.100β = 90.00
c = 144.600γ = 90.00
Software Package:
Software NamePurpose
X-PLORphasing
SCALEPACKdata scaling
X-PLORrefinement
X-PLORmodel building
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-02-12
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance