1Y3A

Structure of G-Alpha-I1 bound to a GDP-selective peptide provides insight into guanine nucleotide exchange


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.240 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of G-Alpha-I1 bound to a GDP-selective peptide provides insight into guanine nucleotide exchange

Johnston, C.A.Willard, F.S.Jezyk, M.R.Fredericks, Z.Bodor, E.T.Jones, M.B.Blaesius, R.Watts, V.J.Harden, T.K.Sondek, J.Ramer, J.K.Siderovski, D.P.

(2005) Structure 7: 1069-1080

  • DOI: 10.1016/j.str.2005.04.007
  • Also Cited By: 3QE0

  • PubMed Abstract: 
  • Heterotrimeric G proteins are molecular switches that regulate numerous signaling pathways involved in cellular physiology. This characteristic is achieved by the adoption of two principal states: an inactive, GDP bound state and an active, GTP bound ...

    Heterotrimeric G proteins are molecular switches that regulate numerous signaling pathways involved in cellular physiology. This characteristic is achieved by the adoption of two principal states: an inactive, GDP bound state and an active, GTP bound state. Under basal conditions, G proteins exist in the inactive, GDP bound state; thus, nucleotide exchange is crucial to the onset of signaling. Despite our understanding of G protein signaling pathways, the mechanism of nucleotide exchange remains elusive. We employed phage display technology to identify nucleotide state-dependent Galpha binding peptides. Herein, we report a GDP-selective Galpha binding peptide, KB-752, that enhances spontaneous nucleotide exchange of Galpha(i) subunits. Structural determination of the Galpha(i1)/peptide complex reveals unique changes in the Galpha switch regions predicted to enhance nucleotide exchange by creating a GDP dissociation route. Our results cast light onto a potential mechanism by which Galpha subunits adopt a conformation suitable for nucleotide exchange.


    Organizational Affiliation

    Department of Pharmacology, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Guanine nucleotide-binding protein G(i), alpha-1 subunit
A, B, C, D
329Homo sapiensMutation(s): 0 
Gene Names: GNAI1
Find proteins for P63096 (Homo sapiens)
Go to Gene View: GNAI1
Go to UniProtKB:  P63096
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
KB752 peptide
E, F, G, H
16N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GDP
Query on GDP

Download SDF File 
Download CCD File 
A, B, C, D
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.240 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 72.943α = 90.00
b = 112.785β = 93.75
c = 109.490γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
HKL-2000data collection
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-07-12
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance