1K4M:
reference: Crystal structures of E. coli nicotinate mononucleotide adenylyltransferase and its complex with deamido-NAD., Zhang H, Zhou T, Kurnasov O, Cheek S, Grishin NV, Osterman A, Structure (Camb) 2002 Jan;10(1):69-79. PMID: 11796112

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