2BSF

Structure of the C-terminal receptor-binding domain of avian reovirus fibre sigmaC, Zn crystal form.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.167 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of the Carboxy-Terminal Receptor-Binding Domain of Avian Reovirus Fibre Sigmac

Guardado Calvo, P.Fox, G.C.Hermo Parrado, X.L.Llamas-Saiz, A.L.Costas, C.Martinez-Costas, J.Benavente, J.van Raaij, M.J.

(2005) J Mol Biol 354: 137

  • DOI: https://doi.org/10.1016/j.jmb.2005.09.034
  • Primary Citation of Related Structures:  
    2BSF, 2BT7, 2BT8

  • PubMed Abstract: 

    Avian reovirus fibre, a homo-trimer of the sigmaC protein, is responsible for primary host cell attachment. The protein expressed in bacteria forms elongated fibres comprised of a carboxy-terminal globular head domain and a slender shaft, and partial proteolysis yielded a carboxy-terminal protease-stable domain that was amenable to crystallisation. Here, we show that this fragment retains receptor-binding capability and report its structure, solved using two-wavelength anomalous diffraction and refined using data collected from three different crystal forms at 2.1 angstroms, 2.35 angstroms and 3.0 angstroms resolution. The carboxy-terminal globular domain has a beta-barrel fold with the same overall topology as the mammalian reovirus fibre (sigma1). However, the monomers of the sigmaC trimer show a more splayed-out arrangement than in the sigma1 structure. Also resolved are two triple beta-spiral repeats of the shaft or stalk domain. The presence in the sequence of heptad repeats amino-terminal to these triple beta-spiral repeats suggests that the unresolved portion of the shaft domain contains a triple alpha-helical coiled-coil structure. Implications for the function and stability of the sigmaC protein are discussed.


  • Organizational Affiliation

    Departamento de Bioquímica y Biología Molecular, Facultad de Farmacia, Universidad de Santiago de Compostela, Campus Sur, E-15782 Santiago de Compostela, Spain.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SIGMA C CAPSID PROTEIN176Avian orthoreovirusMutation(s): 0 
UniProt
Find proteins for Q992I2 (Avian reovirus (strain S1133))
Explore Q992I2 
Go to UniProtKB:  Q992I2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ992I2
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.167 
  • Space Group: P 3 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.777α = 90
b = 74.777β = 90
c = 74.639γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
SHELXDphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-11-03
    Type: Initial release
  • Version 1.1: 2014-10-22
    Changes: Database references, Derived calculations, Non-polymer description, Other, Version format compliance
  • Version 1.2: 2018-02-07
    Changes: Database references, Source and taxonomy
  • Version 1.3: 2024-05-08
    Changes: Data collection, Database references, Derived calculations, Other