Biological Assembly 1  

 3D View: Structure | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 2 assigned by authors.

Biological Assembly 3  

 3D View: Structure | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 3 assigned by authors.

Macromolecule Content

• Total Structure Weight: 114005.09 
• Atom Count: 7759 
• Residue Count: 972 
• Unique protein chains: 1

1TAD

GTPASE MECHANISM OF GPROTEINS FROM THE 1.7-ANGSTROM CRYSTAL STRUCTURE OF TRANSDUCIN ALPHA-GDP-ALF4-

• DOI: 10.2210/pdb1TAD/pdb

• Classification: GTP-BINDING PROTEIN
• Organism(s): Bos taurus


• Deposited: 1995-01-05 Released: 1995-05-08 
• Deposition Author(s): Sondek, J., Lambright, D.G., Noel, J.P., Hamm, H.E., Sigler, P.B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.7 Å
• R-Value Free: 0.266 
• R-Value Work: 0.209 

Literature

GTPase mechanism of Gproteins from the 1.7-A crystal structure of transducin alpha-GDP-AIF-4.

Sondek, J., Lambright, D.G., Noel, J.P., Hamm, H.E., Sigler, P.B.

(1994) Nature 372: 276-279

• PubMed: 7969474 
• DOI: 10.1038/372276a0


• PubMed Abstract: 
  

Aluminium fluoride (AIF-4) activates members of the heterotrimeric G-protein (G alpha beta gamma) family by binding to inactive G alpha.GDP near the site occupied by the gamma-phosphate in G alpha.GTP (ref. 3). Here we describe the crystal structure of transducin alpha.GDP activated with aluminium fluoride (Gt alpha.GDP.AIF-4.H2O) at 1.7 A, a resolution sufficient to establish the coordination geometry of the bound aluminium fluoride as well as the extensive network of direct and water-mediated interactions that stabilize it. These observations are derived from three independent representations in the asymmetric unit, eliminating any chance of drawing conclusions based on stereochemistry imposed by crystal packing. Surprisingly, aluminium fluoride activates G alpha.GDP by binding with a geometry resembling a pentavalent intermediate for GTP hydrolysis. The stabilizing interactions involve not only residues that interact with the gamma-phosphate in Gt alpha.GTP gamma S, but also conserved residues for GTPase activity. Thus the Gt alpha.GDP.AIF-4.H2O structure provides new insight into the mechanism of GTP hydrolysis.

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Related Citations: 

• The 2.2 Angstroms Crystal Structure of Transducin-Alpha Complexed with GTP-Gamma-S
  Noel, J.P.,Hamm, H.E.,Sigler, P.B.
  (1993) Nature 366: 654
• Structural Determinants for Activation of the Alpha-Subunit of a Heterotrimeric G Protein
  Lambright, D.G.,Noel, J.P.,Hamm, H.E.,Sigler, P.B.
  (1994) Nature 369: 621




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Organizational Affiliation: 

Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
TRANSDUCIN-ALPHA	A, B, C	324	Bos taurus	Mutation(s): 0  Gene Names: GNAT1
Find proteins for P04695 (Bos taurus) Go to Gene View: GNAT1 Go to UniProtKB:  P04695

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
GDP	A, B, C	GUANOSINE-5'-DIPHOSPHATE C10 H15 N5 O11 P2 QGWNDRXFNXRZMB-UUOKFMHZSA-N
CA	A, B, C	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
ALF	A, B, C	TETRAFLUOROALUMINATE ION Al F4 UYOMQIYKOOHAMK-UHFFFAOYSA-J
CAC	A, B, C	CACODYLATE ION dimethylarsinate C2 H6 As O2 OGGXGZAMXPVRFZ-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.7 Å
• R-Value Free: 0.266 
• R-Value Work: 0.209 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 74.900	α = 90.00
b = 108.200	β = 111.70
c = 79.000	γ = 90.00

Software Package:

Software Name	Purpose
X-PLOR	refinement
DENZO	data reduction
X-PLOR	model building
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1995-01-05 
• Released Date: 1995-05-08 
• Deposition Author(s): Sondek, J., Lambright, D.G., Noel, J.P., Hamm, H.E., Sigler, P.B.

Revision History 

• Version 1.0: 1995-05-08
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Non-polymer description, Version format compliance
• Version 1.3: 2017-11-29
  Type: Derived calculations, Other