Biological Assembly 1  

 3D View: Structure | Electron Density

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 19834.15 
• Atom Count: 1356 
• Residue Count: 180 
• Unique protein chains: 1

1G8Q

CRYSTAL STRUCTURE OF HUMAN CD81 EXTRACELLULAR DOMAIN, A RECEPTOR FOR HEPATITIS C VIRUS

• DOI: 10.2210/pdb1G8Q/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2000-11-20 Released: 2001-02-21 
• Deposition Author(s): Kitadokoro, K., Bolognesi, M., Bordo, D., Grandi, G., Galli, G., Petracca, R., Falugi, F.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.6 Å
• R-Value Free: 0.238 
• R-Value Work: 0.188 

Literature

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: 12-18

• PubMed: 11226150 
• DOI: 10.1093/emboj/20.1.12
• Also Cited By: 5M4R, 5M3T, 5M3D, 2AVZ


• PubMed Abstract: 
  

Human CD81, a known receptor for hepatitis C virus envelope E2 glycoprotein, is a transmembrane protein belonging to the tetraspanin family. The crystal structure of human CD81 large extracellular domain is reported here at 1.6 A resolution. Each subunit within the homodimeric protein displays a mushroom-like structure, composed of five alpha-helices arranged in 'stalk' and 'head' subdomains. Residues known to be involved in virus binding can be mapped onto the head subdomain, providing a basis for the design of antiviral drugs and vaccines. Sequence analysis of 160 tetraspanins indicates that key structural features and the new protein fold observed in the CD81 large extracellular domain are conserved within the family. On these bases, it is proposed that tetraspanins may assemble at the cell surface into homo- and/or hetero-dimers through a conserved hydrophobic interface located in the stalk subdomain, while interacting with other liganding proteins, including hepatitis C virus E2, through the head subdomain. The topology of such interactions provides a rationale for the assembly of the so-called tetraspan-web.

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Organizational Affiliation: 

Department of Physics, INFM and Advanced Biotechnology Center, University of Genoa, Via Dodecaneso, 33, I-16146 Genova, Switzerland.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
CD81 ANTIGEN, EXTRACELLULAR DOMAIN	A, B	90	Homo sapiens	Mutation(s): 0  Gene Names: CD81 (TAPA1, TSPAN28)
Find proteins for P60033 (Homo sapiens) Go to Gene View: CD81 Go to UniProtKB:  P60033

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.6 Å
• R-Value Free: 0.238 
• R-Value Work: 0.188 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 31.485	α = 90.00
b = 77.172	β = 107.39
c = 38.462	γ = 90.00

Software Package:

Software Name	Purpose
REFMAC	refinement
SHARP	phasing
SCALEPACK	data scaling
DENZO	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-11-20 
• Released Date: 2001-02-21 
• Deposition Author(s): Kitadokoro, K., Bolognesi, M., Bordo, D., Grandi, G., Galli, G., Petracca, R., Falugi, F.

Revision History 

• Version 1.0: 2001-02-21
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2018-04-04
  Type: Advisory, Data collection