An impact of 1H-indol-4-, -5-, -6-, -7-ylamines-substituted compounds on the microbial cell genetic apparatus

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Abstract

The study of new antimicrobial compounds includes determining the mechanism of their effect on the microbial cell. As a rule, an effect for the majority of current synthetic antimicrobials is associated either with suppressed DNA synthesis, or with inhibiting bacterial protein production at translational or transcriptional level. A number of sensitive and easy-todo methods are available for screening and monitoring potential genotoxic activity of a wide range of natural and synthetic compounds. To date, the Ames test has been widely used, which is based on the sensitivity of Salmonella strains to carcinogenic chemicals, although some compounds resulting in Ames negative reactions could actually be carcinogenic to animals. Likewise, the SOS chromotest represents a SOS transcriptional analysis able to assess DNA damage caused by chemical and physical mutagens by measuring the expression of a reporter gene (β-galactosidase) encoding the β-galactosidase enzyme that metabolizes ortho-nitrophenyl galactopyranoside resulting in emerging a yellow-colored compound detected at wavelength 420 nm. Next, the induction of β-galactosidase is normalized by the activity of alkaline phosphatase, an enzyme expressed constitutively by Escherichia coli. SOS chromotest is also widely used for genotoxicological studies providing a quick answer (several hours) and requiring no survival of the test strain. Dose-response curves for various chemicals consist of a linear region, which slope corresponds to the SOS induction. Therefore, the SOS chromotest was selected for the study allowing to identify DNA-mediated effects of the analyzed compounds. The aim of the study was to evaluate the SOSinducing activity for 1H-indol-4-, -5-, -6-, -7-ylamines-substituted antimicrobial compounds. The Escherichia coli PQ 37 with the genotype F-thr leu his-4 pyrD thi galE lacΔU169 srl300::Th10 rpoB rpsL uvrA rfa trp::Mis+ sfiA:: Mud (Ar, lac) cts was used as a test strain. Due to the link of the sfi A::lac Z genes, lacZ β-galactosidase gene expression in the strain PQ 37 is controlled by the sfiA gene promoter, one of the components in the E. coli SOS regulon. Activity of β-galactosidase assessed relative to constitutive microbial alkaline phosphatase reflects SOS-inducing activity triggered by examined compounds in the SOS chromotest that also allows to control their toxic effects on bacterial cells. The data showed that 4,4,4-trifluoroN-(6-methoxy-1,2,3-trimethyl-1H-indol-5-yl)-3-oxobutanamide (1), 4,4,4-trifluoro-N-(6-methyl-2-phenyl-1H-indol-5-yl)- 3-oxobutanamide (2) and N-(1,5-dimethyl-2-phenyl-1H-indol-6-yl)-4,4,4-trifluoro-3-oxobutanamide (3) exerted no SOSinducing activity at the examined concentrations. In contrast, 4-Hydroxy-8-phenyl-4-(trifluoromethyl)-1,3,4,7-tetrahydro- 2H-pyrrolo [2,3-h]-quinoliN-2-one (4), 9-hydroxy-5-methyl-2-phenyl-9-(trifluoromethyl)-1,6,8,9-tetrahydro-7Н-pyrrolo- [2,3-f]-quinoliN-7-one (5), 6-hydroxy-2,3-dimethyl-6-(trifluoromethyl)-1,6,7,9-tetrahydro-8H-pyrrolo[3,2-h]quinoliN-8- one (6) and 1,2,3,9-tetramethyl-6-(trifluoromethyl)-1,9-dihydro-8H-pyrrolo [3,2-h]-quinoliN-8-one (7) displayed a dosedependent SOS-inducing activity at bactericidal concentrations. The data obtained allowed us to identify compounds 4, 5, 6, 7, which mechanism of action relies on affecting microbial cell DNA.

About the authors

A. A. Maseykina

National Research Ogarev Mordovia State University

Author for correspondence.
Email: minibat@mail.ru
ORCID iD: 0000-0001-7604-0680

Alena A. Maseykina,  PhD Student, Department of Immunology, Microbiology and Virology 

430005, Saransk, Bolshevistskaya str., 68

Phone: +7 (951) 343-54-08 

Russian Federation

I. S. Stepanenko

National Research Ogarev Mordovia State University

Email: ymahkina@mail.ru
ORCID iD: 0000-0001-5793-438X

PhD, MD (Medicine), Associate Professor, Department of Immunology, Microbiology and Virology 

Saransk 

S. A. Yamashkin

Mordovia State Pedagogical Institute named after M.E. Evseviev

Email: chem-teh@mail.ru
ORCID iD: 0000-0001-8601-2640

PhD, MD (Chemistry), Professor, Department of Chemistry, Technology and Methods of Training 

Saransk 

E. D. Slastnikov

National Research Ogarev Mordovia State University

Email: slast08@yandex.ru
ORCID iD: 0000-0003-2843-8672

Student 

Saransk 

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