Biological Assembly 1  

 3D View: Structure | Electron Density

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: 19.83 kDa 
• Atom Count: 1550 
• Modelled Residue Count: 176 
• Deposited 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
• Mutation(s): No 


• 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: 1.60 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
• Primary Citation of Related Structures:  
  1G8Q


• 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

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CD81 ANTIGEN, EXTRACELLULAR DOMAIN	A, B	90	Homo sapiens	Mutation(s): 0  Gene Names: CD81, TAPA1, TSPAN28
Find proteins for P60033 (Homo sapiens) Explore P60033  Go to UniProtKB:  P60033
NIH Common Fund Data Resources
PHAROS:  P60033 GTEx:  ENSG00000110651

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 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
b = 77.172	β = 107.39
c = 38.462	γ = 90

Software Package:

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

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
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-04-04
  Changes: Advisory, Data collection