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CD4
Accessory protein for MHC class-II antigen/T-cell receptor interaction. May regulate T-cell activation. Induces the aggregation of lipid rafts. Associates with LCK. Binds to HIV-1 gp120 and to P4HB/PDI and upon HIV-1 binding to the cell membrane, is part of P4HB/PDI- CD4-CXCR4-gp120 complex. Interacts with HIV-1 Envelope polyprotein gp160 and protein Vpu. Interacts with Human Herpes virus 7 capsid proteins. Interacts with PTK2/FAK1; this interaction requires the presence of HIV-1 gp120. Note: This description may include information from UniProtKB.
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| Protein type: Cell surface; Membrane protein, integral |
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Cellular Component: T cell receptor complex; endoplasmic reticulum membrane; endoplasmic reticulum lumen; early endosome; integral to membrane; plasma membrane; lipid raft; external side of plasma membrane
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Molecular Function: protein binding; transmembrane receptor activity; protein homodimerization activity; enzyme binding; zinc ion binding; extracellular matrix structural constituent; coreceptor activity; receptor activity; glycoprotein binding; protein kinase binding; MHC class II protein binding
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Biological Process: maintenance of cellular protein localization; viral reproduction; positive regulation of interleukin-2 biosynthetic process; T cell selection; cytokine production; positive regulation of calcium-mediated signaling; defense response to Gram-negative bacterium; signal transduction; induction by virus of cell-cell fusion in host; T cell receptor signaling pathway; enzyme linked receptor protein signaling pathway; regulation of defense response to virus by virus; positive regulation of peptidyl-tyrosine phosphorylation; cell surface receptor linked signal transduction; positive regulation of protein kinase activity; T cell costimulation; protein palmitoleylation; innate immune response; entry into host cell; immune response; cell adhesion; transmembrane receptor protein tyrosine kinase signaling pathway; T cell differentiation; regulation of T cell activation
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Reference #:
P01730 (UniProtKB)
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| Alt. Names/Synonyms: CD4; CD4 antigen (p55); CD4 molecule; CD4 receptor; CD4mut; T-cell surface antigen T4/Leu-3; T-cell surface glycoprotein CD4 |
| Gene Symbols: CD4 |
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Molecular weight: 51,111 Da
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Basal Isoelectric point: 9.6
Predict pI for various phosphorylation states
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CST Pathways:
T Cell Receptor Signaling
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Protein-Specific Antibodies or siRNAs from Cell Signaling Technology®
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