4Y7U:
reference: Crystal structure of the N-acetylmuramic acid alpha-1-phosphate (MurNAc-alpha1P) uridylytransferase MurU, a minimal sugar-nucleotidyltransferase and potential drug target enzyme in Gram-negative pathogens., Renner-Schneck M, Hinderberger I, Gisin J, Exner T, Mayer C, Stehle T, J Biol Chem. 2015 Mar 12. pii: jbc.M114.620989. PMID: 25767118

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