New Crystal Form of Human CD81 Large Extracellular Loop.

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.234 

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This is version 1.3 of the entry. See complete history


Subunit Association and Conformational Flexibility in the Head-subdomain of Human CD81 Large Extracellular Loop.

Kitadokoro, K.Ponassi, M.Galli, G.Petracca, R.Falugi, F.Grandi, G.Bolognesi, M.

(2002) Biol Chem 383: 1447-1452

  • DOI: https://doi.org/10.1515/BC.2002.164
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The large extracellular loop of human CD81, a tetraspanin mediating hepatitis C virus envelope protein E2 binding to human cells, has been crystallized in a hexagonal form. The three-dimensional structure, solved and refined at 2.6 A resolution (R-factor = 22.8%), shows that the protein adopts a dimeric assembly, based on an association interface built up by tetraspanin-conserved residues. Structural comparisons with the tertiary structure of human CD81 large extracellular loop, previously determined in a different crystal form, show marked conformational fluctuations in the molecular regions thought to be involved in binding to the viral protein, suggesting rules for recognition and assembly within the tetraspan web.

  • Organizational Affiliation

    Department of Physics-INFM, Center of Excellence for Biomedical Research, University of Genoa, Italy.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CD81 antigen
A, B
90Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P60033 (Homo sapiens)
Explore P60033 
Go to UniProtKB:  P60033
PHAROS:  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: 2.60 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.234 
  • Space Group: P 64
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.052α = 90
b = 102.052β = 90
c = 35.283γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-01-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-27
    Changes: Data collection, Database references