3DV2:
reference: Structure of nicotinic acid mononucleotide adenylyltransferase from Bacillus anthracis., Lu S, Smith CD, Yang Z, Pruett PS, Nagy L, McCombs D, Delucas LJ, Brouillette WJ, Brouillette CG, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2008 Oct 1;64(Pt, 10):893-8. Epub 2008 Sep 30. PMID: 18931430

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