ThiC is found within the thiamine biosynthesis operon. ThiC is involved in pyrimidine biosynthesis [1]. ThiC participates in the formation of 4-Amino-5-hydroxymethyl-2-methylpyrimidine from AIR, an intermediate in the de novo pyrimidine biosynthesis. Thic is a member of the radical SAM superfamily [3].

1: Structural genes for thiamine biosynthetic enzymes (thiCEFGH) in Escherichia coli K-12. Vander Horn PB, Backstrom AD, Stewart V, Begley TP; J Bacteriol 1993;175:982-992. PMID:8432721

2: Thiamin biosynthesis in prokaryotes. Begley TP, Downs DM, Ealick SE, McLafferty FW, Van Loon AP, Taylor S, Campobasso N, Chiu HJ, Kinsland C, Reddick JJ, Xi J; Arch Microbiol 1999;171:293-300. PMID:10382260

3: Reconstitution of ThiC in thiamine pyrimidine biosynthesis expands the radical SAM superfamily. Chatterjee A, Li Y, Zhang Y, Grove TL, Lee M, Krebs C, Booker SJ, Begley TP, Ealick SE; Nat Chem Biol. 2008;4:758-765. PMID:18953358