1WIQ

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 5 Å
  • R-Value Free: 0.442 
  • R-Value Work: 0.422 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

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

  • DOI: 10.1038/387527a0
  • Primary Citation of Related Structures:  

  • 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 comple ...

    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.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
T-CELL SURFACE GLYCOPROTEIN CD4
A, B
363Homo sapiensMutation(s): 0 
Gene Names: CD4
Find proteins for P01730 (Homo sapiens)
Go to Gene View: CD4
Go to UniProtKB:  P01730
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 5 Å
  • R-Value Free: 0.442 
  • R-Value Work: 0.422 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 126.000α = 90.00
b = 126.000β = 90.00
c = 205.000γ = 120.00
Software Package:
Software NamePurpose
X-PLORrefinement
CCP4data scaling
X-PLORphasing
CCP4data reduction
X-PLORmodel building
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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