Function
Inducible nitric oxide synthase (iNOS) is an enzyme that produces nitric oxide (NO), a signaling molecule with a wide range of functions throughout the body. In macrophages, NO plays a crucial role in mediating tumoricidal and bactericidal actions. iNOS also exhibits nitrosylase activity, facilitating cysteine S-nitrosylation of cytoplasmic target proteins such as PTGS2/COX2. As a component of the iNOS-S100A8/9 transnitrosylase complex, iNOS is involved in the selective inflammatory stimulus-dependent S-nitrosylation of GAPDH on 'Cys-247'. This process is thought to regulate the GAIT complex activity and potentially influence multiple targets including ANXA5, EZR, MSN, and VIM. iNOS is implicated in inflammatory responses, enhancing the synthesis of proinflammatory mediators like IL6 and IL8.