NLRC4
Domain
In an autoinhibited form the C-terminal leucine-rich repeat (LRR) domain is positioned to sterically occlude one side of the NBD domain and consequently sequester NLRC4 in a monomeric state. An ADP-mediated interaction between the NBD and the WHD also contributes to the autoinhibition.
Function
Key component of inflammasomes that indirectly senses specific proteins from pathogenic bacteria and fungi and responds by assembling an inflammasome complex that promotes caspase-1 activation, cytokine production and macrophage pyroptosis (PubMed:15107016). The NLRC4 inflammasome is activated as part of the innate immune response to a range of intracellular bacteria (By similarity).
Involvement in disease
Autoinflammation with infantile enterocolitis
AIFEC
An autosomal dominant disorder characterized by neonatal-onset enterocolitis, periodic fever, and fatal or near-fatal episodes of autoinflammation. Affected individuals tend to have poor overall growth and gastrointestinal symptoms in infancy, recurrent febrile episodes with splenomegaly, and sometimes hematologic disturbances, arthralgias, or myalgias.
None
The disease is caused by variants affecting the gene represented in this entry.
Familial cold autoinflammatory syndrome 4
FCAS4
A form of autoinflammatory syndrome, a rare autosomal dominant systemic disease characterized by recurrent episodes of maculopapular rash associated with arthralgias, myalgias, fever and chills, swelling of the extremities, and conjunctivitis after generalized exposure to cold.
None
The disease is caused by variants affecting the gene represented in this entry.
Post-translational modifications
Phosphorylated at Ser-533 following infection of macrophages with S.typhimurium (Salmonella). Phosphorylation is essential for NLRC4 inflammasome function to promote caspase-1 activation and pyroptosis. PRKCD phosphorylates Ser-533 in vitro.
Tissue Specificity
Isoform 2 is expressed ubiquitously, although highly expressed in lung and spleen. Isoform 1 is highly expressed in lung, followed by leukocytes especially monocytes, lymph node, colon, brain, prostate, placenta, spleen, bone marrow and fetal liver. Isoform 4 is only detected in brain.
Cellular localization
- Cytoplasm
- Cytoplasm
- Cytosol
- Inflammasome
Alternative names
CARD12, CLAN, CLAN1, IPAF, UNQ6189/PRO20215, NLRC4, NLR family CARD domain-containing protein 4, Caspase recruitment domain-containing protein 12, Ice protease-activating factor, CED-4-like protein Clan, Ipaf