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Interferon gamma (IFNG or IFN-γ) is a dimerized soluble cytokine that is the only member of the type II class of interferons. [5] The existence of this interferon, which early in its history was known as immune interferon, was described by E. F. Wheelock as a product of human leukocytes stimulated with phytohemagglutinin, and by others as a product of antigen-stimulated lymphocytes. [6]
The type-I interferons (IFN) are cytokines which play essential roles in inflammation, immunoregulation, tumor cells recognition, and T-cell responses. In the human genome, a cluster of thirteen functional IFN genes is located at the 9p21.3 cytoband over approximately 400 kb including coding genes for IFNα (IFNA1, IFNA2, IFNA4, IFNA5, IFNA6, IFNA7, IFNA8, IFNA10, IFNA13, IFNA14, IFNA16 ...
The type II IFN (IFN-γ) gene was also isolated around this time. [83] Interferon was first synthesized manually at Rockefeller University in the lab of Dr. Bruce Merrifield, using solid phase peptide synthesis, one amino acid at a time. He later won the Nobel Prize in chemistry.
Structural analysis of type I IFN receptor with different type I IFN ligand subtypes revealed a similar binding site for the different agonists. [8] Mutagenesis studies of type I IFNs, IFNAR1 and IFNAR2 demonstrated important binding residues, i.e. "hotspots", on the type I IFN subtypes which influenced its ability to bind to IFNAR2.
Interferon alfa or HuIFN-alpha-Le, trade name Multiferon, is a pharmaceutical drug composed of natural interferon alpha (IFN-α), obtained from the leukocyte fraction of human blood following induction with Sendai virus. Interferon alfa contains several naturally occurring IFN-α subtypes and is purified by affinity chromatography.
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The human interferon-gamma receptor complex consists the heterodimer of two chains: IFNGR1 and IFNGR2. [2] [3] In unstimulated cells, these subunits are not preassociated with each other but rather associate through their intracellular domains with inactive forms of specific Janus family kinases (Jak1 and Jak2).
The similarity between IFN-λ2 and IFN-λ3 is approximately 96%, similarity of IFNλ1 to IFNλ 2/3 is around 81%. [2] Lowest similarity is found between IFN-λ4 and IFN-λ3 - only around 30%. [ 8 ] [ 9 ] Unlike type I interferon group, which consist of only one exon, type III interferons consist of multiple exons.