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 language | English |
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Journal | Journal of Enzyme Inhibition and Medicinal Chemistry |
Volume | 36 |
Issue | 1 |
Pages (from-to) | 1267-1281 |
Number of pages | 15 |
ISSN | 1475-6366 |
DOIs | |
Publication status | Published - 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