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The four-α-helix bundle family (InterPro: IPR009079): member cytokines have three-dimensional structures with a bundle of four α-helices. This family, in turn, is divided into three sub-families: the IL-2 subfamily. This is the largest family. It contains several non-immunological cytokines including erythropoietin (EPO) and thrombopoietin ...
IL-12 binds to the IL-12 receptor, which is a heterodimeric receptor formed by IL-12Rβ1 and IL-12Rβ2. [6] IL-12Rβ2 is considered to play a key role in IL-12 function, since it is found on activated T cells and is stimulated by cytokines that promote Th1 cells development and inhibited by those that promote Th2 cells development.
Interleukin 3 (IL3) is a cytokine that regulates hematopoiesis by controlling the production, differentiation and function of granulocytes and macrophages. [ 15 ] [ 16 ] The protein, which exists in vivo as a monomer, is produced in activated T cells and mast cells, [ 15 ] [ 16 ] and is activated by the cleavage of an N-terminal signal sequence.
Flt3 ligand (FL) is a hematopoietic four helical bundle cytokine. It is structurally homologous to stem cell factor (SCF) and colony stimulating factor 1 . In synergy with other growth factors, Flt3 ligand stimulates the proliferation and differentiation of various blood cell progenitors.
IL-2 is a member of a specific family of cytokines, each member of which has a four alpha helix bundle; this cytokine family also includes IL-4, IL-7, IL-9, IL-15 and IL-21. IL-2 signals through a IL-2 receptor, a complex consisting of three chains, termed alpha , beta and gamma . The gamma chain is common to all family members. [6]
Interleukin 27 (IL-27) is a member of the IL-12 cytokine family. It is a heterodimeric cytokine that is encoded by two distinct genes, Epstein-Barr virus-induced gene 3 (EBI3) and IL-27p28. IL-27 is expressed by antigen presenting cells and interacts with a specific cell-surface receptor complex known as IL-27 receptor (IL-27R).
IL-30 is a protein from the IL-6 cytokine family with molecular weight of 28 kilodaltons (thus the name IL27-p28). It is a member of the long-chain, 4-helix bundle family of cytokines, making it structurally similar to IL-6. [5] The human gene for IL-30 is located on chromosome 16p11. [5]
Interleukin-28 (IL-28) is a cytokine that comes in two isoforms, IL-28A and IL-28B, and plays a role in immune defense against viruses, including the induction of an "antiviral state" by turning on Mx proteins, 2',5'-oligoadenylate synthetase as well as ISGF3G (Interferon Stimulated Gene Factor 3). [1]
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