Guanylyl cyclase C (GCC, or GUCY2C, MIM 601330) produces cGMP following the binding of either endogenous ligands or heat-stable enterotoxins secreted by E. coli and other enteric bacteria. Activation of GCC initiates a signaling cascade that leads to phosphorylation of the cystic fibrosis transmembrane conductance regulator (CFTR, MIM 602421), followed by a net efflux of ions and water into the intestinal lumen. IKEPP is a regulatory protein that associates with GCC and regulates the amount of cGMP produced following receptor stimulation. Protein Interaction Partner: SPRYD7, ASAP3, SLC41A3, CACNA1S, PTGIR, SLC22A4, SLCO1A2, SLC15A2, SLCO1C1, GUCY2C, SLCO3A1, SLC22A9, SLC22A3, SLC22A5, CFTR, ABCC2, SLC15A1, Protein Size: 571