1TAG

STRUCTURAL DETERMINANTS FOR ACTIVATION OF THE ALPHA-SUBUNIT OF A HETEROTRIMERIC G PROTEIN

• PDB DOI: https://doi.org/10.2210/pdb1TAG/pdb

• Classification: GTP-BINDING PROTEIN
• Organism(s): Bos taurus
• Mutation(s): No 


• Deposited: 1994-11-23 Released: 1995-02-07 
• Deposition Author(s): Lambright, D.G., Noel, J.P., Hamm, H.E., Sigler, P.B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 
  0.211 (Depositor) 
• R-Value Work: 
  0.187 (Depositor) 
• R-Value Observed: 
  0.187 (Depositor) 

Literature

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: 621-628

• PubMed: 8208289 
• DOI: https://doi.org/10.1038/369621a0
• Primary Citation of Related Structures:  
  1TAG


• PubMed Abstract: 
  

  The 1.8 A crystal structure of transducin alpha.GDP, when compared to that of the activated complex with GTP-gamma S, reveals the nature of the conformational changes that occur on activation of a heterotrimeric G-protein alpha-subunit. Structural changes initiated by direct contacts with the terminal phosphate of GTP propagate to regions that have been implicated in effector activation. The changes are distinct from those observed in other members of the GTPase superfamily.

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Organizational Affiliation: 

Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06510.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 37.61 kDa 
• Atom Count: 2,890 
• Modelled Residue Count: 314 
• Deposited Residue Count: 324 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
TRANSDUCIN-ALPHA	A	324	Bos taurus	Mutation(s): 0
UniProt
Find proteins for P04695 (Bos taurus) Explore P04695  Go to UniProtKB:  P04695

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GDP	C [auth A]	GUANOSINE-5'-DIPHOSPHATE C10 H15 N5 O11 P2 QGWNDRXFNXRZMB-UUOKFMHZSA-N
MG	B [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free:  0.211 (Depositor) 
• R-Value Work:  0.187 (Depositor) 
• R-Value Observed: 0.187 (Depositor) 

Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 71.9	α = 90
b = 87.8	β = 90
c = 143.1	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1995-02-07 
Deposition Author(s): Lambright, D.G., Noel, J.P., Hamm, H.E., Sigler, P.B.

Revision History  

• Version 1.0: 1995-02-07
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-11-29
  Changes: Derived calculations, Other
• Version 1.4: 2024-02-14
  Changes: Data collection, Database references, Derived calculations