5BPF:
reference: Structure of D-alanine-D-alanine ligase from Yersinia pestis: nucleotide phosphate recognition by the serine loop., Tran HT, Hong MK, Ngo HP, Huynh KH, Ahn YJ, Wang Z, Kang LW, Acta Crystallogr D Struct Biol. 2016 Jan;72(Pt 1):12-21. doi:, 10.1107/S2059798315021671. Epub 2016 Jan 1. PMID: 26894530

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