Figure 3From: Analysis of Escherichia coli nicotinate mononucleotide adenylyltransferase mutants in vivo and in vitroThe active site of E. coli nicotinic acid mononucleotide adenylyltransferase with bound NAAD (yellow carbons). Amino acid residues (grey carbons) within 6 Å to NAAD are shown (tested in this study). Suggested H-bonds are marked by dotted lines [27]Back to article page