Function
CD3 (or Cluster of Differentiation 3) is a T-cell co-receptor. The CD3 is composed of γ, δ and two ε chains. These 4 chains associate with the T-cell receptor (TCR) and a ζ chain to form an activation signal in T lymphocytes. CD3 assembles as 3 pairs of dimers: εγ, εδ and ζζ. The intracellular domain of CD3 contains a single Immunorecetor Tyrosine-based Activation Motif (ITAM). [1][2]
Relevance
Drugs which bind to CD3 are tested as immunorepressants.
3D structures of CD3
CD3 3D structures