1KKE

Crystal Structure of Reovirus Attachment Protein Sigma1 Trimer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.172 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of reovirus attachment protein sigma1 reveals evolutionary relationship to adenovirus fiber.

Chappell, J.D.Prota, A.E.Dermody, T.S.Stehle, T.

(2002) EMBO J. 21: 1-11

  • DOI: 10.1093/emboj/21.1.1
  • Also Cited By: 2BSF, 2BT7, 2BT8

  • PubMed Abstract: 
  • Reovirus attaches to cellular receptors with the sigma1 protein, a fiber-like molecule protruding from the 12 vertices of the icosahedral virion. The crystal structure of a receptor-binding fragment of sigma1 reveals an elongated trimer with two doma ...

    Reovirus attaches to cellular receptors with the sigma1 protein, a fiber-like molecule protruding from the 12 vertices of the icosahedral virion. The crystal structure of a receptor-binding fragment of sigma1 reveals an elongated trimer with two domains: a compact head with a new beta-barrel fold and a fibrous tail containing a triple beta-spiral. Numerous structural and functional similarities between reovirus sigma1 and the adenovirus fiber suggest an evolutionary link in the receptor-binding strategies of these two viruses. A prominent loop in the sigma1 head contains a cluster of residues that are conserved among reovirus serotypes and are likely to form a binding site for junction adhesion molecule, an integral tight junction protein that serves as a reovirus receptor. The fibrous tail is mainly responsible for sigma1 trimer formation, and it contains a highly flexible region that allows for significant movement between the base of the tail and the head. The architecture of the trimer interface and the observed flexibility indicate that sigma1 is a metastable structure poised to undergo conformational changes upon viral attachment and cell entry.


    Organizational Affiliation

    Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN 37232, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SIGMA 1 PROTEIN
A, B, C
210Reovirus type 3 (strain Dearing)Gene Names: S1
Find proteins for P03528 (Reovirus type 3 (strain Dearing))
Go to UniProtKB:  P03528
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.172 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 52.700α = 90.00
b = 89.000β = 90.00
c = 119.800γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
MLPHAREphasing
DENZOdata reduction
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-12-21
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance