5M3T

Structural tuning of CD81LEL (space group P64)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.021 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.172 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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: 10.1016/j.str.2016.11.003
  • Primary Citation of Related Structures:  

  • 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 (hCD81LEL), but the precise mechanism of virus cell attachment and entry re ...

    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 (hCD81LEL), but the precise mechanism of virus cell attachment and entry remains elusive. Here, by combining the structural analysis of a conspicuous number of crystallized CD81LEL molecules with molecular dynamics simulations, we show that the conformational plasticity of the hCD81LEL 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 hCD81LEL. We propose that this conformational dependence of hCD81LEL, which is finely tuned by pH and redox conditions, enables the virus-receptor interactions to diversely re-engage at endosomal conditions.


    Related Citations: 
    • CD81 extracellular domain 3D structure: insight into the tetraspanin superfamily structural motifs.
      Kitadokoro, K.,Bordo, D.,Galli, G.,Petracca, R.,Falugi, F.,Abrignani, S.,Grandi, G.,Bolognesi, M.
      (2001) EMBO J. 20: 12
    • 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


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CD81 antigen
A, B
101Homo sapiensMutation(s): 0 
Gene Names: CD81 (TAPA1, TSPAN28)
Find proteins for P60033 (Homo sapiens)
Go to Gene View: CD81
Go to UniProtKB:  P60033
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
A, B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.021 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.172 
  • Space Group: P 64
Unit Cell:
Length (Å)Angle (°)
a = 101.300α = 90.00
b = 101.300β = 90.00
c = 35.900γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
xia2data reduction
PHASERphasing
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
MINECOSpainBIO2012-32868
MINECOSpainBFU2012-33947
MINECOSpainBFU2015-64541-R

Revision History 

  • Version 1.0: 2016-12-14
    Type: Initial release
  • Version 1.1: 2017-01-18
    Type: Database references
  • Version 1.2: 2017-12-13
    Type: Database references, Structure summary