1GU8

SENSORY RHODOPSIN II


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.27 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.230 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Early Structural Rearrangements in the Photocycle of an Integral Membrane Sensory Receptor

Edman, K.Royant, A.Nollert, P.Maxwell, C.A.Pebay-Peyroula, E.Navarro, J.Neutze, R.Landau, E.M.

(2002) Structure 10: 473

  • DOI: https://doi.org/10.1016/s0969-2126(02)00736-0
  • Primary Citation of Related Structures:  
    1GU8, 1GUE

  • PubMed Abstract: 

    Sensory rhodopsins are the primary receptors of vision in animals and phototaxis in microorganisms. Light triggers the rapid isomerization of a buried retinal chromophore, which the protein both accommodates and amplifies into the larger structural rearrangements required for signaling. We trapped an early intermediate of the photocycle of sensory rhodopsin II from Natronobacterium pharaonis (pSRII) in 3D crystals and determined its X-ray structure to 2.3 A resolution. The observed structural rearrangements were localized near the retinal chromophore, with a key water molecule becoming disordered and the retinal's beta-ionone ring undergoing a prominent movement. Comparison with the early structural rearrangements of bacteriorhodopsin illustrates how modifications in the retinal binding pocket of pSRII allow subtle differences in the early relaxation of photoisomerized retinal.


  • Organizational Affiliation

    Department of Molecular Biotechnology, Chalmers University of Technology, Box 462, S-40530 Gothenburg, Sweden.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SENSORY RHODOPSIN II239Natronomonas pharaonisMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P42196 (Natronomonas pharaonis)
Explore P42196 
Go to UniProtKB:  P42196
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42196
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.27 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.230 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.51α = 90
b = 128.553β = 90
c = 50.799γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
CCP4data scaling
AMoREphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-04-12
    Type: Initial release
  • Version 1.1: 2012-06-27
    Changes: Data collection, Database references, Derived calculations, Non-polymer description, Other, Refinement description, Structure summary, Version format compliance
  • Version 1.2: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description