Abstract
Phenazines are heteroaromatic compounds consisting of a central pyrazine ring fused with two benzenes. Different functional groups attached to the dibenzopyrasin core cause differences in the chemical, physical, and biological properties of phenazines. Interest in these compounds has not diminished for decades. New biological activities and practical applications discovered in recent years force researchers to investigate all aspects of the synthesis, degradation, and mechanisms of action of phenazines. In this study, we have demonstrated the involvement of the coxA gene product (cytochrome c oxidase, su I) in the production of phenazines in P. chlororaphis subsp. aurantiaca. Overlap PCR was used to knock out the coxA gene and the resulting mutants were screened for their ability to grow on rich and minimal culture media and for phenazine production. The reintroduction of the full-length coxA gene into the B-162/coxA strains was used to further confirm the role of this gene product in the ability to produce phenazines. We were able to show that the product of the coxA gene is necessary for phenazine production in rich growth media. At the same time, the CoxA protein does not seem to have any effect on phenazine production in M9 minimal salt medium. We could show that knocking down even one subunit of the cytochrome c oxidase complex leads to a significant reduction (to trace concentrations) or complete suppression of phenazine antibiotic production on rich PCA medium in P. chlororaphis subsp. aurantiaca.
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This work was supported by the Belarusian State Program of Scientific Research (project number 20211293).
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Katsiaryna G. Verameyenka was involved in the conception and design of the study. Katsiaryna G. Verameyenka and Volha A. Naumouskaya prepared the material, collected and analysed the data. The first draft of the manuscript was written by Katsiaryna G. Verameyenka and all authors commented on earlier versions of the manuscript. All authors read and approved the final manuscript.
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Verameyenka, K.G., Naumouskaya, V.A. & Maximova, N.P. Cytochrome c oxidase is one of the key enzymes providing the ability to produce phenazines in Pseudomonas chlororaphis subsp. aurantiaca. World J Microbiol Biotechnol 39, 279 (2023). https://doi.org/10.1007/s11274-023-03685-2
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DOI: https://doi.org/10.1007/s11274-023-03685-2