Abstract—
Binary biofilms containing gram-positive bacteria Micrococcus thailandicus HB or Kocuria rhizophila strain 4A-2G and gram-negative bacteria Escherichia coli strain K-12 or strain ET12567 pRAG56 were obtained. Strain E. coli ET12567 contained a plasmid encoding aminoglycoside phosphotransferase, the enzyme which inactivates kanamycin. A new kinetic approach was developed for selective detection of metabolically active gram-positive bacteria in binary biofilms with E. coli, based on the differences in reduction rate of the electron acceptor, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT). It was found that the studied E. coli strains did not exert a protective effect upon the action of antibiotics vancomycin and oxacillin on gram-positive bacteria in the binary biofilms under formation. However, a protective effect was found in the case of preformed binary biofilms: the growth of gram-positive bacteria in binary biofilms was observed at the concentrations of antibiotics oxacillin and kanamycin, which almost completely suppressed growth in the mono-species biofilms of these gram-positive bacteria. The presence of a protective effect was confirmed by several methods (dynamics of MTT reduction, densitometric evaluation of biofilm staining, measurement of the optical density of MTT extracts, and CFU enumeration).
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This work was supported by the Ministry of Science and Higher Education of the Russian Federation.
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Translated by A. Oleskin
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Plakunov, V.K., Nikolaev, Y.A., Gannesen, A.V. et al. A New Approach to Detection of the Protective Effect of Escherichia coli on Gram-Positive Bacteria in Binary Biofilms in the Presence of Antibiotics. Microbiology 88, 275–281 (2019). https://doi.org/10.1134/S0026261719030093
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DOI: https://doi.org/10.1134/S0026261719030093