4GU3

Crystal structure of the T1L reovirus attachment protein sigma1 in complex with the GM2 glycan


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The GM2 Glycan Serves as a Functional Coreceptor for Serotype 1 Reovirus.

Reiss, K.Stencel, J.E.Liu, Y.Blaum, B.S.Reiter, D.M.Feizi, T.Dermody, T.S.Stehle, T.

(2012) Plos Pathog. 8: e1003078-e1003078

  • DOI: 10.1371/journal.ppat.1003078
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Viral attachment to target cells is the first step in infection and also serves as a determinant of tropism. Like many viruses, mammalian reoviruses bind with low affinity to cell-surface carbohydrate receptors to initiate the infectious process. Reo ...

    Viral attachment to target cells is the first step in infection and also serves as a determinant of tropism. Like many viruses, mammalian reoviruses bind with low affinity to cell-surface carbohydrate receptors to initiate the infectious process. Reoviruses disseminate with serotype-specific tropism in the host, which may be explained by differential glycan utilization. Although α2,3-linked sialylated oligosaccharides serve as carbohydrate receptors for type 3 reoviruses, neither a specific glycan bound by any reovirus serotype nor the function of glycan binding in type 1 reovirus infection was known. We have identified the oligosaccharide portion of ganglioside GM2 (the GM2 glycan) as a receptor for the attachment protein σ1 of reovirus strain type 1 Lang (T1L) using glycan array screening. The interaction of T1L σ1 with GM2 in solution was confirmed using NMR spectroscopy. We established that GM2 glycan engagement is required for optimal infection of mouse embryonic fibroblasts (MEFs) by T1L. Preincubation with GM2 specifically inhibited type 1 but not type 3 reovirus infection of MEFs. To provide a structural basis for these observations, we defined the mode of receptor recognition by determining the crystal structure of T1L σ1 in complex with the GM2 glycan. GM2 binds in a shallow groove in the globular head domain of T1L σ1. Both terminal sugar moieties of the GM2 glycan, N-acetylneuraminic acid and N-acetylgalactosamine, form contacts with the protein, providing an explanation for the observed specificity for GM2. Viruses with mutations in the glycan-binding domain display diminished hemagglutination capacity, a property dependent on glycan binding, and reduced capacity to infect MEFs. Our results define a novel mode of virus-glycan engagement and provide a mechanistic explanation for the serotype-dependent differences in glycan utilization by reovirus.


    Organizational Affiliation

    Interfaculty Institute of Biochemistry, University of Tübingen, Tübingen, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Outer capsid protein sigma-1
A, B, C
219Reovirus type 1 (strain Lang)Gene Names: S1
Find proteins for P04506 (Reovirus type 1 (strain Lang))
Go to UniProtKB:  P04506
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BGC
Query on BGC

Download SDF File 
Download CCD File 
A, B, C
BETA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
GAL
Query on GAL

Download SDF File 
Download CCD File 
A, B, C
BETA-D-GALACTOSE
C6 H12 O6
WQZGKKKJIJFFOK-FPRJBGLDSA-N
 Ligand Interaction
NGA
Query on NGA

Download SDF File 
Download CCD File 
A, B, C
N-ACETYL-D-GALACTOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-JAJWTYFOSA-N
 Ligand Interaction
SIA
Query on SIA

Download SDF File 
Download CCD File 
A, B, C
O-SIALIC ACID
C11 H19 N O9
SQVRNKJHWKZAKO-YRMXFSIDSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.185 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 147.460α = 90.00
b = 147.460β = 90.00
c = 164.480γ = 120.00
Software Package:
Software NamePurpose
XDSdata scaling
PHASERphasing
XDSdata reduction
XSCALEdata scaling
BUSTERrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2012-08-29 
  • Released Date: 2012-12-05 
  • Deposition Author(s): Reiss, K., Stehle, T.

Revision History 

  • Version 1.0: 2012-12-05
    Type: Initial release
  • Version 1.1: 2012-12-26
    Type: Database references