NALP proteins include the apoptosis regulator APAF1 (apoptotic protease activating factor 1) and mammalian NOD-LRR proteins and are thought to be involved in inflammation and reproduction. NALP4, also known as PYRIN-containing APAF1-like protein 4, has a C-terminal leucine-rich repeat (LRR) region, an N-terminal Pyrin domain (PYD) followed by a NACHT domain, and a NACHT-associated domain. In transfected 293 cells, NALP4 suppressed NF-kappa-B induction by TNF-a and IL-1-b, suggesting NALP4 operates at a point of convergence in these two signaling pathways. NALP4 also suppressed NF-kappa-B induction resulting from overexpression of several adapter proteins and protein kinases involved in these pathways, including TRAF2, TRAF6, RIP, and IRAK2, as well as the IKK-alpha and IKK-beta, suggesting that NALP4 is critical in modulating NF-kappa-B activity.
Cancer/testis antigen 58; CLR19.5, CT58, NALP4, PAN2, PYPAF4, RNH2; CT58; NACHT, leucine rich repeat and PYD containing 4; NACHT, leucine rich repeat and PYD containing 4A; NACHT, LRR and PYD containing protein 4; NACHT, LRR and PYD domains-containing protein 4; NACHT, LRR and PYD domains-containing protein 4A; NACHT/LRR/pyrin domain-containing protein 4; NALP-ita; NLR family, pyrin domain containing 4; nucleotide-binding oligomerization domain, leucine rich repeat and pyrin domain containing 4; PAAD and NACHT-containing protein 2; PAN2; PYPAF4; PYRIN and NACHT-containing protein 2; PYRIN-containing APAF1-like protein 4; Ribonuclease inhibitor 2