Structural tuning of CD81LEL (space group P64)

Experimental Data Snapshot

  • Resolution: 2.02 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 

Starting Model: experimental
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Mechanism of Structural Tuning of the Hepatitis C Virus Human Cellular Receptor CD81 Large Extracellular Loop.

Cunha, E.S.Sfriso, P.Rojas, A.L.Roversi, P.Hospital, A.Orozco, M.Abrescia, N.G.

(2017) Structure 25: 53-65

  • DOI: https://doi.org/10.1016/j.str.2016.11.003
  • Primary Citation of Related Structures:  
    5M2C, 5M33, 5M3D, 5M3T, 5M4R

  • PubMed Abstract: 

    Hepatitis C virus (HCV) enters into human hepatocytes via tetraspanin hCD81. HCV glycoprotein E2 recognizes the "head" subdomain of the large extracellular loop (LEL) of CD81 (hCD81 LEL ), but the precise mechanism of virus cell attachment and entry remains elusive. Here, by combining the structural analysis of a conspicuous number of crystallized CD81 LEL molecules with molecular dynamics simulations, we show that the conformational plasticity of the hCD81 LEL head subdomain is a molecular property of the receptor. The observed closed, intermediate, and open conformations of the head subdomain provide distinct binding platforms. Simulations at pH 7.4 and 4.0 indicate that this dynamism is pH modulated. The crystallized double conformation of the disulfide bridge C157-C175 at the base of the head subdomain identifies this bond as the molecular zipper of the plasticity of hCD81 LEL . We propose that this conformational dependence of hCD81 LEL , which is finely tuned by pH and redox conditions, enables the virus-receptor interactions to diversely re-engage at endosomal conditions.

  • Organizational Affiliation

    Structural Biology Unit, CIC bioGUNE, CIBERehd, Derio 48160, Spain.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CD81 antigen
A, B
101Homo sapiensMutation(s): 0 
Gene Names: CD81TAPA1TSPAN28
UniProt & NIH Common Fund Data Resources
Find proteins for P60033 (Homo sapiens)
Explore P60033 
Go to UniProtKB:  P60033
GTEx:  ENSG00000110651 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP60033
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.02 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 
  • Space Group: P 64
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.3α = 90
b = 101.3β = 90
c = 35.9γ = 120
Software Package:
Software NamePurpose
xia2data reduction
XSCALEdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number

Revision History  (Full details and data files)

  • Version 1.0: 2016-12-14
    Type: Initial release
  • Version 1.1: 2017-01-18
    Changes: Database references
  • Version 1.2: 2017-12-13
    Changes: Database references, Structure summary
  • Version 1.3: 2024-01-17
    Changes: Data collection, Database references, Refinement description