Sphingomonas sp. KT-1 PahZ2 Structure Reveals a Role for Conformational Dynamics in Peptide Bond Hydrolysis.
Sphingomonas sp. KT-1 PahZ2 Structure Reveals a Role for Conformational Dynamics in Peptide Bond Hydrolysis.
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DOI:
10.1021/acs.jpcb.1c01216
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发表时间:
2021-06-10
期刊:
影响因子:
--
通讯作者:
Miller JM
中科院分区:
文献类型:
--
作者:
Brambley CA;Yared TJ;Gonzalez M;Jansch AL;Wallen JR;Weiland MH;Miller JM
Poly(aspartic acid) (PAA) is a common water-soluble polycarboxylate used in a broad range of applications. PAA biodegradation and environmental assimilation were first identified in river water bacterial strains, Sphingomonas sp. KT-1 and Pedobacter sp. KP-2. Within Sphingomonas sp. KT-1, PahZ1KT-1 cleaves β-amide linkages to oligo(aspartic acid) and then is degraded by PahZ2KT-1. Recently, we reported the first structure for PahZ1KT-1. Here, we report novel structures for PahZ2KT-1 bound to either Gd3+/Sm3+ or Zn2+ cations in a dimeric state consistent with M28 metallopeptidase family members. PahZ2KT-1 monomers include a dimerization domain and a catalytic domain with dual Zn2+ cations. MD methods predict the putative substrate binding site to span across the dimerization and catalytic domains, where NaCl promotes the transition from an open conformation to a closed conformation that positions the substrate adjacent to catalytic zinc ions. Structural knowledge of PahZ1KT-1 and PahZ2KT-1 will allow for protein engineering endeavors to develop novel biodegradation reagents.
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