Category: Human Clusters of Differentiation (or CD) Molecules
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Indoleamine-pyrrole 2,3-dioxygenase (IDO or INDO) is involved in tryptophan metabolism
Indoleamine-pyrrole 2,3-dioxygenase (IDO or INDO EC 1.13.11.52) is a heme-containing enzyme physiologically expressed in a number of tissues and cells, such as the small intestine, lungs, female genital tract or placenta. In humans is encoded by the IDO1 gene. IDO is involved in tryptophan metabolism. It is one of three enzymes that catalyze the first and rate-limiting step in the kynurenine pathway, the O2-dependent oxidation of L-tryptophan to N-formylkynurenine, the others being indolamine-2,3-dioxygenase 2 (IDO2) and tryptophan 2,3-dioxygenase…
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Interleukin-2-recptor alpha chain (IL2RA also called CD25) is the human protein encoded by the IL2RA gene.
The interleukin 2 (IL2) receptor alpha (IL2RA) and beta (IL2RB) chains, together with the common gamma chain (IL2RG), constitute the high-affinity IL2 receptor. Homodimeric alpha chains (IL2RA) result in low-affinity receptor, while homodimeric beta (IL2RB) chains produce a medium-affinity receptor. Normally an integral-membrane protein, soluble IL2RA has been isolated and determined to result from extracellular proteolysis. Alternately-spliced…
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Cluster of Differentiation (Cluster of Designation or Classification Determinant)
The cluster of differentiation (also known as cluster of designation or classification determinant and often abbreviated as CD) is a protocol used for the identification and investigation of cell surface molecules providing targets for immunophenotyping of cells.[1] In terms of physiology, CD molecules can act in numerous ways, often acting as receptors or ligands important to the cell. A signal cascade is usually initiated, altering the behavior of the cell (see cell…
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CD45antigen (Protein tyrosine phosphatase, receptor type, C also known as PTPRC and formerly known as leukocyte common antigen LCA)
Protein tyrosine phosphatase, receptor type, C also known as PTPRC is an enzyme that, in humans, is encoded by the PTPRCgene.[5] PTPRC is also known as CD45antigen (CD stands for cluster of differentiation), which was originally called leukocyte common antigen (LCA).[6] Function The protein product of this gene, best known as CD45, is a member of the protein tyrosine phosphatase (PTP) family. PTPs are signaling molecules that regulate a…
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T helper cells (Th cells), also known as CD4+ cells or CD4-positive cells
The T helper cells (Th cells), also known as CD4+ cells or CD4-positive cells, are a type of T cell that play an important role in the adaptive immune system. They aid the activity of other immune cells by releasing cytokines. They are considered essential in B cellantibody class switching, breaking cross-tolerance in dendritic cells, in the activation and growth of cytotoxic T cells, and in maximizing bactericidal activity of phagocytes such as macrophages and neutrophils. CD4+ cells…
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CD4
In molecular biology, CD4 (cluster of differentiation 4) is a glycoprotein that serves as a co-receptor for the T-cell receptor (TCR). CD4 is found on the surface of immune cells such as T helper cells, monocytes, macrophages, and dendritic cells. It was discovered in the late 1970s and was originally known as leu-3 and T4 (after the OKT4 monoclonal antibody that reacted with it) before being named CD4 in 1984.[5] In humans,…
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CD31
Platelet endothelial cell adhesion molecule (PECAM-1) also known as cluster of differentiation 31 (CD31) is a protein that in humans is encoded by the PECAM1gene found on chromosome17q23.3.[5][6][7][8] PECAM-1 plays a key role in removing aged neutrophils from the body. Structure PECAM-1 is a highly glycosylated protein with a mass of approximately 130 kDa.[9] The structure of this protein was determined by molecular cloning in 1990, when it was…
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KIT (gene)
Proto-oncogene c-KIT is the gene encoding the receptor tyrosine kinase protein known as tyrosine-protein kinase KIT, CD117 (cluster of differentiation 117) or mast/stem cell growth factor receptor (SCFR).[5] Multiple transcript variants encoding different isoforms have been found for this gene.[6][7] KIT was first described by the German biochemist Axel Ullrich in 1987 as the cellular homolog of the feline sarcoma viral oncogene v-kit.[8] Function KIT is…
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List of human clusters of differentiation (OR CD) MOLECULES
* = group; ** = not listed on hcdm CD1* MHC-like molecule that presents lipid molecules CD1a CD1a (Cluster of Differentiation 1a), or T-cell surface glycoprotein CD1a, is a human protein encoded by the CD1A gene. An antigen-presenting protein that binds self and non-self lipid and glycolipid antigens and presents them to T-cell receptors on natural killer T-cells. CD1b T-cell surface glycoprotein CD1b. Expressed on cortical thymocytes, certain T-cell leukemias…