Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 80.91 kDa 
• Atom Count: 5624 
• Residue Count: 726 
• Unique protein chains: 1

1WIP

STRUCTURE OF T-CELL SURFACE GLYCOPROTEIN CD4, MONOCLINIC CRYSTAL FORM

• DOI: 10.2210/pdb1WIP/pdb

• Classification: GLYCOPROTEIN
• Organism(s): Homo sapiens
• Mutation(s): No 


• Deposited: 1996-12-18 Released: 1997-07-07 
• Deposition Author(s): Wu, H., Kwong, P.D., Hendrickson, W.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 4.00 Å
• R-Value Free: 0.427 
• R-Value Work: 0.452 
• R-Value Observed: 0.452 

Literature

Dimeric association and segmental variability in the structure of human CD4.

Wu, H., Kwong, P.D., Hendrickson, W.A.

(1997) Nature 387: 527-530

• PubMed: 9168119 
• DOI: 10.1038/387527a0
• Primary Citation of Related Structures:  
  1WIQ, 1WIP, 1WIO


• PubMed Abstract: 
  

CD4 is a co-receptor in the cellular immune response. It increases the avidity of association between a T cell and an antigen-presenting cell by interacting with non-polymorphic portions of the complex between class II major histocompatibility complex (MHC) and T-cell receptor (TCR) molecules, and it contributes directly to signal transduction through its cytoplasmic association with the lymphocyte kinase Lck. CD4 also serves as the high-affinity receptor for cellular attachment and entry of the human immunodeficiency virus (HIV). The extracellular portion of CD4 comprises four immunoglobulin-like domains (D1-D4). This part of human CD4 (residues 1-369) has been characterized as a recombinant soluble protein (sCD4), and crystal structures have been described for the human D1D2 fragment and for the rat D3D4 fragment. We have now determined the structures of intact sCD4 in three crystal lattices. These structures have a hinge-like variability at the D1D2 to D3D4 junction that might be important in immune recognition and HIV fusion, and a common dimeric association through D4 domains. Dynamic light scattering measurements and chemical crosslinking of sCD4 corroborate dimerization at high protein concentration. We suggest that such dimers mayhave relevance as mediators of signal transduction in T cells.

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York 10032, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
T-CELL SURFACE GLYCOPROTEIN CD4	A, B	363	Homo sapiens	Mutation(s): 0  Gene Names: CD4
Find proteins for P01730 (Homo sapiens) Explore P01730  Go to UniProtKB:  P01730
NIH Common Fund Data Resources
PHAROS:  P01730 GTEx:  ENSG00000010610

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 4.00 Å
• R-Value Free: 0.427 
• R-Value Work: 0.452 
• R-Value Observed: 0.452 
• Space Group: P 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 100.5	α = 90
b = 123.4	β = 103.4
c = 100.6	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
REPLACE	model building
X-PLOR	refinement
REPLACE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1996-12-18 
• Released Date: 1997-07-07 
Deposition Author(s): Wu, H., Kwong, P.D., Hendrickson, W.A.

Revision History 

• Version 1.0: 1997-07-07
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance