6MKA:
reference: The structures of penicillin binding protein 4 (PBP4) and PBP5 from Enterococci provide structural insights into beta-lactam resistance., Moon TM, D'Andrea ED, Lee CW, Soares A, Jakoncic J, Desbonnet C, Solache MG, Rice LB, Page R, Peti W, J Biol Chem. 2018 Oct 24. pii: RA118.006052. doi: 10.1074/jbc.RA118.006052. PMID: 30355734

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