CD8

Function

CD8 (or Cluster of Differentiation 8) is a T-cell co-receptor. CD8 binds to class I MHC protein. CD8 exists as 2 isoforms: α and β. CD8 forms a dimer of CD8α and CD8β. The extracellular domain of CD8 has immunoglobulin variable-like conformation. This domain of CD8α interacts with α3 domain of class I MHC enhancing the binding of the T-cell receptor and the target cell.^[1]

(3b9k).^[2]

3D Structures of CD8

CD8 3D structures

Structure of CD8α (magenta) and CD8β (green) complex with antibody heavy chain (cyan) and light chain (salmon) (PDB entry 3b9k)

Drag the structure with the mouse to rotate

ReferencesReferences

↑ Devine L, Sun J, Barr MR, Kavathas PB. Orientation of the Ig domains of CD8 alpha beta relative to MHC class I. J Immunol. 1999 Jan 15;162(2):846-51. PMID:9916707
↑ Shore DA, Issafras H, Landais E, Teyton L, Wilson IA. The crystal structure of CD8 in complex with YTS156.7.7 Fab and interaction with other CD8 antibodies define the binding mode of CD8 alphabeta to MHC class I. J Mol Biol. 2008 Dec 31;384(5):1190-202. Epub 2008 Oct 7. PMID:18929574 doi:10.1016/j.jmb.2008.09.069

Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

Michal Harel, Alexander Berchansky

[1] Devine L, Sun J, Barr MR, Kavathas PB. Orientation of the Ig domains of CD8 alpha beta relative to MHC class I. J Immunol. 1999 Jan 15;162(2):846-51. PMID:9916707

[2] Shore DA, Issafras H, Landais E, Teyton L, Wilson IA. The crystal structure of CD8 in complex with YTS156.7.7 Fab and interaction with other CD8 antibodies define the binding mode of CD8 alphabeta to MHC class I. J Mol Biol. 2008 Dec 31;384(5):1190-202. Epub 2008 Oct 7. PMID:18929574 doi:10.1016/j.jmb.2008.09.069

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