4BI4:
reference: Structural basis for type VI secreted peptidoglycan DL-endopeptidase function, specificity and neutralization in Serratia marcescens., Srikannathasan V, English G, Bui NK, Trunk K, O'Rourke PE, Rao VA, Vollmer W, Coulthurst SJ, Hunter WN, Acta Crystallogr D Biol Crystallogr. 2013 Dec;69(Pt 12):2468-82. doi:, 10.1107/S0907444913022725. Epub 2013 Nov 19. PMID: 24311588

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