Nature Communications (Sep 2019)
Extracellular nicotinate phosphoribosyltransferase binds Toll like receptor 4 and mediates inflammation
Abstract
The enzyme nicotinate phosphoribosyltransferase (NAPRT) mediates the rate-limiting step in NAD salvage pathway starting from nicotinic acid. Here the authors show that NAPRT can be detected extracellularly, binds to Toll like receptor 4, and activates NF-kB signaling and cytokine production in macrophage via NAD synthesis-independent pathways.