FIIND domain (IPR025307)

Short name: FIIND_dom

Overlapping homologous superfamilies


Domain relationships



The function to find (FIIND) domain was initially discovered in two proteins, NLRP1 (aka NALP1, CARD7, NAC, DEFCAP) and CARD8 (aka TUCAN, Cardinal) [PMID: 11408476]. NLRP1 is a member of the Nod-like receptor (NLR) protein superfamily and is involved in apoptosis and inflammation. To date, it is the only NLR protein known to have a FIIND domain. The FIIND domain is also present in the CARD8 protein where, like in NLRP1, it is followed by a C-terminal CARD domain. Both proteins are described to form an "inflammasome", a macro-molecular complex able to process caspase 1 and activate pro-IL1beta [PMID: 12563287]. The FIIND domain is present in only a very small subset of the kingdom of life, comprising primates, rodents (mouse, rat), carnivores (dog) and a few more, such as horse. The function of this domain is yet to be determined. Publications describing the newly discovered NLRP1 protein failed to identify it as a separate domain; for example, it was taken as part of the adjacent leucine rich repeat domain (LRR) [PMID: 11076957]. Upon discovery of CARD8 it was noted that the N-terminal region shared significant sequence identity with an undescribed region in NLRP1 [PMID: 11408476]. Before getting its final name, FIIND [PMID: 12563287], this domain was termed NALP1-associated domain (NAD) [PMID: 12191486].

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
PROSITE profiles