Reactome: A Curated Pathway Database

Interferon gamma signaling (R-HSA-877300) [Homo sapiens]


Interferon-gamma (IFN-gamma) belongs to the type II interferon family and is secreted by activated immune cells-primarily T and NK cells, but also B-cells and APC. INFG exerts its effect on cells by interacting with the specific IFN-gamma receptor (IFNGR). IFNGR consists of two chains, namely IFNGR1 (also known as the IFNGR alpha chain) and IFNGR2 (also known as the IFNGR beta chain). IFNGR1 is the ligand binding receptor and is required but not sufficient for signal transduction, whereas IFNGR2 do not bind IFNG independently but mainly plays a role in IFNG signaling and is generally the limiting factor in IFNG responsiveness. Both IFNGR chains lack intrinsic kinase/phosphatase activity and thus rely on other signaling proteins like Janus-activated kinase 1 (JAK1), JAK2 and Signal transducer and activator of transcription 1 (STAT-1) for signal transduction. IFNGR complex in its resting state is a preformed tetramer and upon IFNG association undergoes a conformational change. This conformational change induces the phosphorylation and activation of JAK1, JAK2, and STAT1 which in turn induces genes containing the gamma-interferon activation sequence (GAS) in the promoter.

Additional Information
GO Biological Process interferon-gamma-mediated signaling pathway (0060333)
Literature References
pubMedId Title Journal Year
18929502 IFNgamma signaling-does it mean JAK-STAT? Cytokine Growth Factor Rev 2008
9462485 The interferon gamma (IFN-gamma) receptor: a paradigm for the multichain cytokine receptor Cytokine Growth Factor Rev 1997
9143700 The IFN gamma receptor: a paradigm for cytokine receptor signaling Annu Rev Immunol 1997
14525967 Interferon-gamma: an overview of signals, mechanisms and functions J Leukoc Biol 2004