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NACHT, LRR and PYD domains-containing protein 4 is a protein that in humans is encoded by the NLRP4gene.
NALPs are cytoplasmic proteins that form a subfamily within the larger CATERPILLER protein family. Most short NALPs, such as NALP4, have an N-terminal pyrin (MEFV; MIM 608107) domain (PYD), followed by a NACHT domain, a NACHT-associated domain (NAD), and a C-terminal leucine-rich repeat (LRR) region.
The long NALP, NALP1 (MIM 606636), also has a C-terminal extension containing a function to find domain (FIIND) and a caspase recruitment domain (CARD). NALPs are implicated in the activation of proinflammatory caspases (e.g., CASP1; MIM 147678) via their involvement in multiprotein complexes called inflammasomes (Tschopp et al., 2003).
Grenier JM, Wang L, Manji GA, et al. (2002). "Functional screening of five PYPAF family members identifies PYPAF5 as a novel regulator of NF-kappaB and caspase-1". FEBS Lett. 530 (1–3): 73–8. doi:10.1016/S0014-5793(02)03416-6. PMID12387869. S2CID25023390.