1SUJ

X-ray crystal structure of ambystoma tigrinum cone arrestin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.246 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of cone arrestin at 2.3A: evolution of receptor specificity.

Sutton, R.B.Vishnivetskiy, S.A.Robert, J.Hanson, S.M.Raman, D.Knox, B.E.Kono, M.Navarro, J.Gurevich, V.V.

(2005) J.Mol.Biol. 354: 1069-1080

  • DOI: 10.1016/j.jmb.2005.10.023

  • PubMed Abstract: 
  • Arrestins play a fundamental role in the regulation and signal transduction of G protein-coupled receptors. Here we describe the crystal structure of cone arrestin at 2.3A resolution. The overall structure of cone visual arrestin is similar to the cr ...

    Arrestins play a fundamental role in the regulation and signal transduction of G protein-coupled receptors. Here we describe the crystal structure of cone arrestin at 2.3A resolution. The overall structure of cone visual arrestin is similar to the crystal structures of rod visual and the non-visual arrestin-2, consisting of two domains, each containing ten beta-sheets. However, at the tertiary structure level, there are two major differences, in particular on the concave surfaces of the two domains implicated in receptor binding and in the loop between beta-strands I and II. Functional analysis shows that cone arrestin, in sharp contrast to its rod counterpart, bound cone pigments and non-visual receptors. Conversely, non-visual arrestin-2 bound cone pigments, suggesting that it may also regulate phototransduction and/or photopigment trafficking in cone photoreceptors. These findings indicate that cone arrestin displays structural and functional features intermediate between the specialized rod arrestin and the non-visual arrestins, which have broad receptor specificity. A unique functional feature of cone arrestin was the low affinity for its cognate receptor, resulting in an unusually rapid dissociation of the complex. Transient arrestin binding to the photopigment in cones may be responsible for the extremely rapid regeneration and reuse of the photopigment that is essential for cone function at high levels of illumination.


    Organizational Affiliation

    Department of Neuroscience and Cell Biology, University of Texas Medical Branch, and Sealy Center for Molecular Science & Structural Biology, Galveston, TX 77555, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
cone arrestin
A
392Ambystoma tigrinumMutation(s): 0 
Gene Names: ARR2
Find proteins for Q9PTE7 (Ambystoma tigrinum)
Go to UniProtKB:  Q9PTE7
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.246 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 70.762α = 90.00
b = 75.049β = 90.00
c = 79.059γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
CNSphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-08-23
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance