Description: Catalyzes the condensation of nicotinamide with 5-phosphoribosyl-1-pyrophosphate to yield nicotinamide mononucleotide, an intermediate in the biosynthesis of NAD. It is the rate limiting component in the mammalian NAD biosynthesis pathway (By similarity). (www.uniprot.org) Produced in E.coli as single, non-glycosylated, polypeptide chain containing 511 amino acids and having a N-terminal His Tag