Latency, thermal stability, and identification of an inhibitory compound of mirolysin, a secretory protease of the human periodontopathogen Tannerella forsythia

Krzysztof M Zak, Mark J Bostock, Irena Waligorska, Ida B Thøgersen, Jan J Enghild, Grzegorz M Popowicz, Przemyslaw Grudnik, Jan Potempa, Miroslaw Ksiazek*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

3 Citations (Scopus)

Abstract

Mirolysin is a secretory protease of Tannerella forsythia, a member of the dysbiotic oral microbiota responsible for periodontitis. In this study, we show that mirolysin latency is achieved by a "cysteine-switch" mechanism exerted by Cys23 in the N-terminal profragment. Mutation of Cys23 shortened the time needed for activation of the zymogen from several days to 5 min. The mutation also decreased the thermal stability and autoproteolysis resistance of promirolysin. Mature mirolysin is a thermophilic enzyme and shows optimal activity at 65 °C. Through NMR-based fragment screening, we identified a small molecule (compound (cpd) 9) that blocks promirolysin maturation and functions as a competitive inhibitor (Ki = 3.2 µM), binding to the S1' subsite of the substrate-binding pocket. Cpd 9 shows superior specificity and does not interact with other T. forsythia proteases or Lys/Arg-specific proteases.

Original languageEnglish
JournalJournal of Enzyme Inhibition and Medicinal Chemistry
Volume36
Issue1
Pages (from-to)1267-1281
Number of pages15
ISSN1475-6366
DOIs
Publication statusPublished - 2021

Keywords

  • NMR-based fragment screening
  • Periodontitis
  • Tannerella forsythia
  • protease inhibitors
  • proteolysis
  • GINGIPAINS
  • ACTIVATION
  • MECHANISM
  • NMR-SPECTROSCOPY
  • PORPHYROMONAS-GINGIVALIS
  • PREVALENCE
  • SUPPRESSION
  • RED COMPLEX
  • VIRULENCE FACTORS
  • PERIODONTAL HEALTH

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