1MF6

Transducin gamma subunit, C-terminal domain 60-71, rhodopsin-bound state: Ensemble of 15 models determined by TrNOE spectroscopy

• PDB DOI: https://doi.org/10.2210/pdb1MF6/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Bos taurus
• Mutation(s): No 


• Deposited: 2002-08-09 Released: 2003-04-15 
• Deposition Author(s): Kisselev, O.G.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 15 
• Conformers Submitted: 15 
• Selection Criteria: all calculated structures submitted 

Literature

RHODOPSIN CONTROLS A CONFORMATIONAL SWITCH ON THE TRANSDUCIN gamma SUBUNIT

Kisselev, O.G., Downs, M.A.

(2003) Structure 11: 367-373

• PubMed: 12679015 
• DOI: https://doi.org/10.1016/s0969-2126(03)00045-5
• Primary Citation of Related Structures:  
  1MF6


• PubMed Abstract: 
  

  Rhodopsin, a prototypical G protein-coupled receptor, catalyzes the activation of a heterotrimeric G protein, transducin, to initiate a visual signaling cascade in photoreceptor cells. The betagamma subunit complex, especially the C-terminal domain of the transducin gamma subunit, Gtgamma(60-71)farnesyl, plays a pivotal role in allosteric regulation of nucleotide exchange on the transducin alpha subunit by light-activated rhodopsin. We report that this domain is unstructured in the presence of an inactive receptor but forms an amphipathic helix upon rhodopsin activation. A K65E/E66K charge reversal mutant of the gamma subunit has diminished interactions with the receptor and fails to adopt the helical conformation. The identification of this conformational switch provides a mechanism for active GPCR utilization of the betagamma complex in signal transfer to G proteins.

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Organizational Affiliation: 

Department of Ophthalmology, Saint Louis University School of Medicine, St. Louis, MO 63104, USA. [e-mail]

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 1.34 kDa 
• Atom Count: 93 
• Modelled Residue Count: 12 
• Deposited Residue Count: 12 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(T)gamma-T1 subunit	A	12	Bos taurus	Mutation(s): 0
UniProt
Find proteins for P02698 (Bos taurus) Explore P02698  Go to UniProtKB:  P02698

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 15 
• Conformers Submitted: 15 
• Selection Criteria: all calculated structures submitted 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2003-04-15 
Deposition Author(s): Kisselev, O.G.

Revision History  

• Version 1.0: 2003-04-15
  Type: Initial release
  
• Version 1.1: 2008-04-28
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-02-23
  Changes: Data collection, Database references, Derived calculations