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Protein & Peptide Letters

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ISSN (Print): 0929-8665
ISSN (Online): 1875-5305

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Research Article

Molecular Insights into Zn2+ Inhibition of the Antibacterial Endopeptidase Lysostaphin from Staphylococcus simulans

Author(s): Ke Chen, Suvash Chandra Ojha, Chompounoot Imtong, Aung Khine Linn, Hui-Chun Li, Charoensri Thonabulsombat and Chanan Angsuthanasombat*

Volume 28, Issue 2, 2021

Published on: 13 June, 2020

Page: [140 - 148] Pages: 9

DOI: 10.2174/0929866527666200613221359

Price: $65

Abstract

Background: Mature lysostaphin (~28-kDa Lss) from Staphylococcus simulans proves effective in killing methicillin-resistant Staphylococcus aureus (MRSA) which is endemic in hospitals worldwide. Lss is Zn2+-dependent endopeptidase, but its bacteriolytic activity could be affected by exogenously added Zn2+.

Objective: To gain greater insights into structural and functional impacts of Zn2+and Ni2+on Lss-induced bioactivity.

Methods: Lss purified via immobilized metal ion-affinity chromatography was assessed for bioactivity using turbidity reduction assays. Conformational change of metal ion-treated Lss was examined by circular dichroism and intrinsic fluorescence spectroscopy. Co-sedimentation assay was performed to study interactions between Zn2+-treated Lss and S. aureus peptidoglycans. Metal ionbinding prediction and intermolecular docking were used to locate an extraneous Zn2+-binding site.

Results: A drastic decrease in Lss bioactivity against S. aureus and MRSA was revealed only when treated with Zn2+, but not Ni2+, albeit no negative effect of diethyldithiocarbamate—Zn2+-chelator on Lss-induced bioactivity. No severe conformational change was observed for Lss incubated with exogenous Zn2+ or Ni2+. Lss pre-treated with Zn2+ efficiently bound to S. aureus cell-wall peptidoglycans, suggesting non-interfering effect of exogenous metal ions on cell-wall targeting (CWT) activity. In silico analysis revealed that exogenous Zn2+, but not Ni2+, preferably interacted with a potential extraneous Zn2+-binding site (His253, Glu318 and His323) placed near the Zn2+-coordinating Lssactive site within the catalytic (CAT) domain.

Conclusion: Our present data signify the adverse influence of exogenous Zn2+ ions on Lss-induced staphylolytic activity through the exclusive presence within the CAT domain of an extraneous inhibitory Zn2+-binding site, without affecting the CWT activity.

Keywords: Inhibitory Zn2+-binding site, peptidoglycan binding, staphylolytic activity, Zn2+-chelation, metallopeptidase, methicillin- resistant Staphylococcus aureus.

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