Development of a New Inhibitor of Bacterial Cystathionine γ-Lyase Based on 6-Bromoindole and Aminothiophene

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Abstract

Cystathionine γ-lyase (CSE) is a key enzyme for the H2S generation in such pathogenic bacteria as Staphylococcus aureus, Pseudomonas aeruginosa, etc. Suppression of CSE activity significantly increases the sensitivity of bacteria to the action of antibiotics. Here, we present a method for the synthesis of a novel indole-based CSE inhibitor, 3-amino-5-[(6-bromo-1H-indol-1-yl)methyl]thiophene, named MNS1. The synthesis of this compound is based on the modification of substituted thiophene as the main structural fragment, which is involved the alkylation of 6-bromoindole at the final stages. The dissociation constant of the MNS1 complex with bacterial CSE (from S. aureus, SaCSE) was 0.5 μM, which was an order of magnitude lower than that for human CSE (hCSE). The MNS1 compound was shown to effectively enhance the antibacterial effect of gentamicin against Bacillus subtilis, allowing it to be used as an antibiotic potentiator, to inhibit the growth of CSE-expressing bacterial cells.

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About the authors

R. A. Novikov

Engelhardt Institute of Molecular Biology of the Russian Academy of Sciences; Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences

Email: solyev@gmail.com
Russian Federation, Moscow, 119991; Moscow, 119991

D. N. Platonov

Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences

Email: solyev@gmail.com
Russian Federation, Moscow, 119991

A. Yu. Bely

Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences

Email: solyev@gmail.com
Russian Federation, Moscow, 119991

K. V. Potapov

Engelhardt Institute of Molecular Biology of the Russian Academy of Sciences; Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences

Email: solyev@gmail.com
Russian Federation, Moscow, 119991; Moscow, 119991

M. A. Novikov

Engelhardt Institute of Molecular Biology of the Russian Academy of Sciences; Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences

Email: solyev@gmail.com
Russian Federation, Moscow, 119991; Moscow, 119991

Yu. V. Tomilov

Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences

Email: solyev@gmail.com
Russian Federation, Moscow, 119991

O. I. Kechko

Engelhardt Institute of Molecular Biology of the Russian Academy of Sciences

Email: solyev@gmail.com
Russian Federation, Moscow, 119991

T. A. Seregina

Engelhardt Institute of Molecular Biology of the Russian Academy of Sciences

Email: solyev@gmail.com
Russian Federation, Moscow, 119991

P. N. Solyev

Engelhardt Institute of Molecular Biology of the Russian Academy of Sciences

Author for correspondence.
Email: solyev@gmail.com
Russian Federation, Moscow, 119991

V. A. Mitkevich

Engelhardt Institute of Molecular Biology of the Russian Academy of Sciences

Email: solyev@gmail.com
Russian Federation, Moscow, 119991

References

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Supplementary files

Supplementary Files
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2. Fig. 1. Scheme of synthesis of 3-amino-5-[(6-bromo-1H-indole-1-yl) hydrochloridemethyl]thiophene (MNS1). Designations: MeONa — sodium methylate, Boc — tert-butyloxycarbonyl, DMAP — 4-dimethylaminopyridine, DMF — dimethylformamide, LDA — lithium diisopropylamide, THF — tetrahydrofuran, rt — room temperature, Δ — boiling.

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3. Fig. 2. Comparative analysis of NL2 and MNS1 as gentamicin potentiators for the B. subtilis 168 strain. a ‒ Representative growth curves of the B. subtilis 168 strain in the presence of 0.1 micrograms/ml of gentamicin (Gm), as well as 50 micrograms of NL2 or MNS1. The cells were grown at 37°C with aeration in the automated Bioscreen C growth analysis system. The results are presented as average values ± standard deviation calculated based on three repetitions in one experiment. b – Analysis of H2S generation by B. subtilis 168 cells in the presence of NL2 and MNS1. A brown stain appears on the strips of filter paper soaked in a 2% solution of lead acetate, caused by the formation of PbS salt as a result of evaporation of H2S by bacterial suspension. The figures indicate changes in H2S production relative to control cells.

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