5A0S:
reference: Structural Basis of Proline-Proline Peptide Bond Specificity of the Metalloprotease Zmp1 Implicated in Motility of Clostridium difficile., Schacherl M, Pichlo C, Neundorf I, Baumann U, Structure. 2015 Jul 21. pii: S0969-2126(15)00271-3. doi:, 10.1016/j.str.2015.06.018. PMID: 26211609

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