3X0E

Crystal structure of the ectodomain of human CD81 large extracellular loop (hCD81-LEL)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

An intramolecular bond at cluster of differentiation 81 ectodomain is important for hepatitis C virus entry

Yang, W.Zhang, M.Chi, X.Liu, X.Qin, B.Cui, S.

(2015) FASEB J 

  • DOI: 10.1096/fj.15-272880
  • Primary Citation of Related Structures:  
    3X0E, 3X0F, 3X0G

  • PubMed Abstract: 
  • Hepatitis C virus (HCV) infection is one of the leading causes of chronic liver diseases; however, HCV vaccine remains unavailable to date. One main obstacle is the lack of an efficient small animal model. Cluster of differentiation 81 (CD81) is an essential entry coreceptor for HCV species specificity to humans, though the underlying mechanisms are yet to be fully elucidated ...

    Hepatitis C virus (HCV) infection is one of the leading causes of chronic liver diseases; however, HCV vaccine remains unavailable to date. One main obstacle is the lack of an efficient small animal model. Cluster of differentiation 81 (CD81) is an essential entry coreceptor for HCV species specificity to humans, though the underlying mechanisms are yet to be fully elucidated. We performed structural, biophysical, and virologic studies on HCV nonpermissive CD81s from mice and African green monkeys [mouse cluster of differentiation 81 (mCD81) and African green monkey cluster of differentiation 81 (agmCD81)] and compared with human cluster of differentiation 81 (hCD81). We discovered an intramolecular hydrogen bond (Gln188-Nε2-H: Glu196-Oε2, 2 Å, 124°) within the large extracellular loop (LEL) of mCD81 and a salt bridge (Lys188-Nζ: Asp196-Oδ2, 2.4 Å) within agmCD81-LEL between residues 188 and 196. This structural feature is missing in hCD81. We demonstrated that the introduction of a single 188-196 bond to hCD81 impaired its binding affinity to HCV envelope glycoprotein 2 (HCV E2) and significantly decreased HCV pseudoviral particle (HCVpp) entry efficiency (4.92- to 8.42-fold) and cell culture-grown HCV (HCVcc) infectivity (4.55-fold), despite the availability of Phe186. For HCV nonpermissive CD81s, the introduction of Phe186 by Leu186F substitution alone was insufficient to confer HCV permissiveness. The disruption of the original 188-196 bond and Leu186F substitution were both required for potent binding to HCV E2 HCVpp entry efficiency and HCVcc infectivity. Our structural and biophysical analyses suggest that the intramolecular 188-196 bond restricts the intrinsic conformational dynamics of D-helix of CD81-LEL, which is essential for HCV entry, thus impairs HCV permissiveness. Our findings reveal a novel molecular determinant for HCV entry in addition to the well-characterized Phe186 and provide further guideline for selecting an HCV small animal model.


    Organizational Affiliation

    Ministry of Health Key Laboratory of Systems Biology of Pathogens, Institute of Pathogen Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China wyang@ipb.pumc.edu.cn cui.sheng@ipb.pumc.edu.cn.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CD81 antigenA, B93Homo sapiensMutation(s): 0 
Gene Names: CD81TAPA1TSPAN28
UniProt & NIH Common Fund Data Resources
Find proteins for P60033 (Homo sapiens)
Explore P60033 
Go to UniProtKB:  P60033
PHAROS:  P60033
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 31.124α = 90
b = 77.408β = 107.94
c = 38.497γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
PHENIXrefinement
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

  • Deposited Date: 2014-10-14 
  • Released Date: 2015-07-01 
  • Deposition Author(s): Zhang, M., Cui, S.

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-01
    Type: Initial release
  • Version 1.1: 2015-07-08
    Changes: Database references