NLR family pyrin domain containing 4 (NLRP4)

NLR family pyrin domain containing 4 (NLRP4) is a cytosolic pattern recognition receptor (PRR) in the NOD-like receptor (NLR) protein family distinguished by the presence of an N-terminal pyrin domain (PYD), a central NACHT domain, and a C-terminal leucine-rich repeat (LRR) region. It acts as a multifunctional intracellular regulator involved in the modulation of inflammatory, antiviral, and autophagy pathways. NLRP4 functions as a **negative regulator** of type I interferon signaling by mediating the degradation of TBK1 via recruitment of the ubiquitin ligase DTX4, and is also shown to suppress NF-κB activation in response to cytokines such as TNF-α and IL-1β. Notably, it does not interact with the ASC adaptor protein typical for many inflammasome-forming NLRPs, indicating unique functional interactions. NLRP4 is expressed in a range of tissues, including immune-related and reproductive organs, and its gene is also known as a cancer/testis antigen, though its role in cancer is not fully established. No direct approved drugs are known; however, its involvement in immune modulation highlights it as a candidate for further therapeutic investigation.

Other names

NALP4PAN2PYPAF4RNH2CT58Cancer/testis antigen 58CLR19.5NACHT, LRR and PYD domains-containing protein 4NACHT, leucine rich repeat and PYD containing 4PYRIN and NACHT-containing protein 2PYRIN-containing APAF1-like protein 4ribonuclease inhibitor 2

No drugs known; however, inhibition or modulation of NLRP4 would be expected to potentially enhance type I interferon, increase autophagy, or alter NF-κB activation depending on context