Latency, thermal stability, and identification of an inhibitory compound of mirolysin, a secretory protease of the human periodontopathogen Tannerella forsythia .
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 ...
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 ( K i = 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.
Organizational Affiliation:
Department of Oral Immunology and Infectious Diseases, University of Louisville School of Dentistry, Louisville, KY, USA.
FA [auth DDD], GA [auth DDD], K [auth AAA], L [auth AAA], MA [auth EEE],
FA [auth DDD], GA [auth DDD], K [auth AAA], L [auth AAA], MA [auth EEE], NA [auth EEE], Q [auth BBB], R [auth BBB], TA [auth FFF], UA [auth FFF], V [auth CCC], VA [auth FFF], W [auth CCC], X [auth CCC]
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