4RPI:
reference: Mycobacterial nicotinate mononucleotide adenylyltransferase: structure, mechanism, and implications for drug discovery., Rodionova IA, Zuccola HJ, Sorci L, Aleshin AE, Kazanov MD, Ma CT, Sergienko E, Rubin EJ, Locher CP, Osterman AL, J Biol Chem. 2015 Mar 20;290(12):7693-706. doi: 10.1074/jbc.M114.628016. Epub, 2015 Jan 28. PMID: 25631047

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).