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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]
He later won the Nobel Prize in chemistry. Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing mass cultivation and purification from bacterial cultures [84] or derived from yeasts. Interferon can also be produced by recombinant mammalian cells. [85]
A particular problem in the area of liquid-state thermodynamics is the sourcing of reliable thermodynamic constants. These constants are necessary for the successful prediction of the free energy state of the system; without this information it is impossible to model the equilibrium phases of the system.
An interferon-stimulated gene (ISG) is a gene that can be expressed in response to stimulation by interferon. [ 1 ] [ 2 ] Interferons bind to receptors on the surface of a cell, initiating protein signaling pathways within the cell.
The vaccinia virus interferon (IFN)-gamma receptor (IFN-gammaR), which is a 43 kDa soluble glycoprotein that is secreted from infected cells early during infection. IFN-gammaR from vaccinia virus, cowpox virus and camelpox virus exist naturally as homodimers , whereas the cellular IFN-gammaR dimerises only upon binding the homodimeric IFN-gamma.
The interferon receptor is a molecule displayed on the surface of cells which interacts with extracellular interferons. Class II cytokine receptors bind type I, type II, and type III interferons. Class II cytokine receptors bind type I, type II, and type III interferons.
The antigen receptor of T cells is the T-cell receptor (TCR), which is composed of two chains, either the TCR-alpha and -beta chains, or the TCR-delta and gamma chains. All TCR chains contain two Ig domains in the extracellular portion; one IgV domain at the N-terminus and one IgC1 domain adjacent to the cell membrane .
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).