Interferon gamma receptor complex (includes subunits IFNGR1 and IFNGR2) (IFNGR complex (subunits commonly abbreviated as IFNGR1 and IFNGR2))

The interferon gamma receptor complex is the cellular receptor for interferon gamma (IFN-γ), consisting of two non-preassociated subunits: IFNGR1 and IFNGR2. Upon IFN-γ binding, the complex forms a ligand-induced assembly of two IFNGR1 and two IFNGR2 molecules, bringing together their intracellular domains and constitutively associated Janus kinases (Jak1 and Jak2). This triggers phosphorylation of IFNGR1, recruitment and phosphorylation of STAT1, and gene regulatory activity essential for innate and adaptive immune responses, including upregulation of major histocompatibility complex molecules and activation of macrophages. Defects in either receptor subunit lead to profound immune impairment, particularly in defense against intracellular pathogens, and the receptor’s signaling dynamics are being explored for immunotherapeutic and anti-inflammatory interventions.

Other names

Interferon gamma receptorIFN-γ receptorIFNGRType II interferon receptor

Ligand binding induces receptor dimerization, recruitment and activation of Janus kinases (Jak1 and Jak2), and subsequent phosphorylation and dimerization of STAT1, resulting in transcriptional activation of target genes. Some drugs/variants seek selective signaling outcomes by modulating receptor agonism or antagonism.