1B9Y

STRUCTURAL ANALYSIS OF PHOSDUCIN AND ITS PHOSPHORYLATION-REGULATED INTERACTION WITH TRANSDUCIN BETA-GAMMA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.213 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A molecular mechanism for the phosphorylation-dependent regulation of heterotrimeric G proteins by phosducin.

Gaudet, R.Savage, J.R.McLaughlin, J.N.Willardson, B.M.Sigler, P.B.

(1999) Mol.Cell 3: 649-660

  • Primary Citation of Related Structures:  1B9X

  • PubMed Abstract: 
  • Visual signal transduction is a nearly noise-free process that is exquisitely well regulated over a wide dynamic range of light intensity. A key component in dark/light adaptation is phosducin, a phosphorylatable protein that modulates the amount of ...

    Visual signal transduction is a nearly noise-free process that is exquisitely well regulated over a wide dynamic range of light intensity. A key component in dark/light adaptation is phosducin, a phosphorylatable protein that modulates the amount of transducin heterotrimer (Gt alpha beta gamma) available through sequestration of the beta gamma subunits (Gt beta gamma). The structure of the phosphophosducin/Gt beta gamma complex combined with mutational and biophysical analysis provides a stereochemical mechanism for the regulation of the phosducin-Gt beta gamma interaction. Phosphorylation of serine 73 causes an order-to-disorder transition of a 20-residue stretch, including the phosphorylation site, by disrupting a helix-capping motif. This transition disrupts phosducin's interface with Gt beta gamma, leading to the release of unencumbered Gt beta gamma, which reassociates with the membrane and Gt alpha to form a signaling-competent Gt alpha beta gamma heterotrimer.


    Related Citations: 
    • Crystal Structure at 2.4 Angstroms Resolution of the Complex of Transducin Beta-Gamma and its Regulator, Phosducin
      Gaudet, R.,Bohm, A.,Sigler, P.B.
      (1996) Cell 87: 577
    • Crystal Structure of a Ga Protein Beta Gamma Dimer at 2.1A Resolution
      Sondek, J.,Bohm, A.,Lambright, D.G.,Hamm, H.E.,Sigler, P.B.
      () Nature 379: 369


    Organizational Affiliation

    Department of Molecular Biophysics, Howard Hughes Medical Institute, Yale University, New Haven, Connecticut 06511, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (TRANSDUCIN)
A
340Bos taurusGene Names: GNB1
Find proteins for P62871 (Bos taurus)
Go to Gene View: GNB1
Go to UniProtKB:  P62871
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (TRANSDUCIN)
B
68Bos taurusGene Names: GNGT1
Find proteins for P02698 (Bos taurus)
Go to Gene View: GNGT1
Go to UniProtKB:  P02698
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (PHOSDUCIN)
C
246Rattus norvegicusGene Names: Pdc (Rpr1)
Find proteins for P20942 (Rattus norvegicus)
Go to UniProtKB:  P20942
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GD
Query on GD

Download SDF File 
Download CCD File 
A, B, C
GADOLINIUM ATOM
Gd
UIWYJDYFSGRHKR-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.213 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 76.470α = 90.00
b = 89.920β = 90.00
c = 102.340γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
DENZOdata reduction
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-02-23
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance