| Tissue Specificity | Highly expressed in T-helper cells. The presence of CD4 is a hallmark of T-helper cells which are specialized in the activation and growth of cytotoxic T-cells, regulation of B cells, or activation of phagocytes. CD4 is also present in other immune cells such as macrophages, dendritic cells or NK cells. |
| Post Translational Modifications | Palmitoylation and association with LCK contribute to the enrichment of CD4 in lipid rafts. Phosphorylated by PKC.phosphorylation plays an important role for CD4 internalization. |
| Function | Integral membrane glycoprotein that plays an essential role in the immune response and serves multiple functions in responses against both external and internal offenses. In T-cells, functions primarily as a coreceptor for MHC class II molecule:peptide complex. The antigens presented by class II peptides are derived from extracellular proteins while class I peptides are derived from cytosolic proteins. Interacts simultaneously with the T-cell receptor (TCR) and the MHC class II presented by antigen presenting cells (APCs). In turn, recruits the Src kinase LCK to the vicinity of the TCR-CD3 complex. LCK then initiates different intracellular signaling pathways by phosphorylating various substrates ultimately leading to lymphokine production, motility, adhesion and activation of T-helper cells. In other cells such as macrophages or NK cells, plays a role in differentiation/activation, cytokine expression and cell migration in a TCR/LCK-independent pathway. Participates in the development of T-helper cells in the thymus and triggers the differentiation of monocytes into functional mature macrophages. |
| Protein Name | T-Cell Surface Glycoprotein Cd4T-Cell Differentiation Antigen L3t4T-Cell Surface Antigen T4/Leu-3Cd Antigen Cd4 |
| Database Links | Reactome: R-MMU-1462054Reactome: -MMU-202424Reactome: -MMU-202427Reactome: -MMU-202430Reactome: -MMU-202433Reactome: -MMU-389948Reactome: -MMU-449836Reactome: -MMU-8856825Reactome: -MMU-8856828 |
| Cellular Localisation | Cell MembraneSingle-Pass Type I Membrane Protein |
| Alternative Protein Names | T-Cell Surface Glycoprotein Cd4 proteinT-Cell Differentiation Antigen L3t4 proteinT-Cell Surface Antigen T4/Leu-3 proteinCd Antigen Cd4 proteinCd4 protein |
Information sourced from Uniprot.org
