1ES3:
reference: Catalytic mechanism of the Streptomyces K15 DD-transpeptidase/penicillin-binding protein probed by site-directed mutagenesis and structural analysis., Rhazi N, Charlier P, Dehareng D, Engher D, Vermeire M, Frere JM, Nguyen-Disteche M, Fonze E, Biochemistry 2003 Mar 18;42(10):2895-906. PMID: 12627955

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