5MHR

T3D reovirus sigma1 complexed with 9BG5 Fab fragments

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 

wwPDB Validation   3D Report Full Report


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Literature

Structural Insights into Reovirus sigma 1 Interactions with Two Neutralizing Antibodies.

Dietrich, M.H., Ogden, K.M., Katen, S.P., Reiss, K., Sutherland, D.M., Carnahan, R.H., Goff, M., Cooper, T., Dermody, T.S., Stehle, T.

(2017) J Virol 91

  • DOI: https://doi.org/10.1128/JVI.01621-16
  • Primary Citation of Related Structures:  
    5MHR, 5MHS

  • PubMed Abstract: 

    • Reovirus attachment protein σ1 engages glycan receptors and junctional adhesion molecule-A (JAM-A) and is thought to undergo a conformational change during the proteolytic disassembly of virions to infectious subvirion particles (ISVPs) that accompanies cell entry ...

    Reovirus attachment protein σ1 engages glycan receptors and junctional adhesion molecule-A (JAM-A) and is thought to undergo a conformational change during the proteolytic disassembly of virions to infectious subvirion particles (ISVPs) that accompanies cell entry. The σ1 protein is also the primary target of neutralizing antibodies. Here, we present a structural and functional characterization of two neutralizing antibodies that target σ1 of serotype 1 (T1) and serotype 3 (T3) reoviruses. The crystal structures revealed that each antibody engages its cognate σ1 protein within the head domain via epitopes distinct from the JAM-A-binding site. Surface plasmon resonance and cell-binding assays indicated that both antibodies likely interfere with JAM-A engagement by steric hindrance. To define the interplay between the carbohydrate receptor and antibody binding, we conducted hemagglutination inhibition assays using virions and ISVPs. The glycan-binding site of T1 σ1 is located in the head domain and is partly occluded by the bound Fab in the crystal structure. The T1-specific antibody inhibited hemagglutination by virions and ISVPs, probably via direct interference with glycan engagement. In contrast to T1 σ1, the carbohydrate-binding site of T3 σ1 is located in the tail domain, distal to the antibody epitope. The T3-specific antibody inhibited hemagglutination by T3 virions but not ISVPs, indicating that the antibody- and glycan-binding sites in σ1 are in closer spatial proximity on virions than on ISVPs. Our results provide direct evidence for a structural rearrangement of σ1 during virion-to-ISVP conversion and contribute new information about the mechanisms of antibody-mediated neutralization of reovirus.

    Organizational Affiliation: 

    Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Viral attachment protein sigma 1
A, B, C, D, E
A, B, C, D, E, F
165Reovirus sp.Mutation(s): 0 
Gene Names: S1
UniProt
Find proteins for Q86335 (Reovirus sp)
Explore Q86335 
Go to UniProtKB:  Q86335
Entity Groups  
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UniProt GroupQ86335
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
9BG5 Fab light chain,LOC100046793 protein,MAb 110 light chain
G, H, J, L, O
G, H, J, L, O, Q
214Mus musculusMutation(s): 0 
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
9BG5 Fab heavy chain
I, K, M, N, P
I, K, M, N, P, R
219Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.163α = 103.13
b = 109.306β = 113.56
c = 131.699γ = 103.48
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Cootmodel building
PHASERphasing
XDSdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of HealthUnited StatesR01 AI118887

Revision History  (Full details and data files)

  • Version 1.0: 2017-02-15
    Type: Initial release