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Volume 11, Issue 3

Differential effect of monoterpenes and flavonoids on the transcription of aromatic ring-hydroxylating dioxygenase genes in C1 and sp. WAY2 Open Access

Abstract

Aromatic ring-hydroxylating dioxygenases (ARHDs) play a crucial role in the aerobic biodegradation of both natural and anthropogenic aromatic compounds. Although their ability to process contaminants is not entirely understood, it is thought to have evolved from the transformation of structurally similar secondary plant metabolites (SPMs). Hence, to investigate this connection, we tested a variety of SPMs from the monoterpene and flavonoid classes as carbon sources and transcriptional effectors of several phylogenetically distant ARHD genes involved in the degradation of aromatic pollutants. Specifically, we focused on , and in C1, whose genomic analysis is also presented hereinafter, and , and in s sp. WAY2. Whilst induction was only observed with ()-carvone for and of strain WAY2, and with -cymene for and of strains C1 and WAY2, respectively, an extensive inhibition by flavonoids was observed for most of the genes in both strains. To the best of our knowledge, our study is the first to report the effect of flavonoids and monoterpenes on the transcription of , and genes. In addition, we show that, in contrast to pseudomonads, many flavonoids inhibit the transcription of the ARHD genes in rhodococci. Thus, our work provides a new perspective on flavonoids as the transcriptional effectors of ARHDs, highlighting the significant variability of these enzymes and the divergent responses that they elicit. Moreover, our results contribute to understanding the complex interactions between microorganisms and SPMs and provide insights into the molecular basis of a number of them.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): aromatic pollutants , aromatic ring-hydroxylating dioxygenases , biodegradation , flavonoids , monoterpenes and Rhodococcus
Funding
This study was supported by the:
  • HORIZON EUROPE Framework Programme (Award GA 101060625)
    • Principal Award Recipient: OndrejUhlik
  • Ministerstvo Školství, Mládeže a Tělovýchovy (Award CZ.02.01.01/00/22_008/0004597)
    • Principal Award Recipient: OndrejUhlik
  • Grantová Agentura České Republiky (Award 20-00291S)
    • Principal Award Recipient: MichalStrejcek
© 2025 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License.
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Differential effect of monoterpenes and flavonoids on the transcription of aromatic ring-hydroxylating dioxygenase genes in Rhodococcus opacus C1 and Rhodococcus sp. WAY2
M Gen 11, 001359 (2025); https://doi.org/10.1099/mgen.0.001359
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