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- W3080345139 abstract "Abstract Some Burkholderia cepacia complex (Bcc) strains have been reported to produce 4-hydroxy-3-methyl-2-alkylquinolines (HMAQs), analogous to the 4-hydroxy-2-alkylquinolines of Pseudomonas aeruginosa . Using in silico analyses, we previously showed that the hmqABCDEFG operon, which encodes enzymes involved in the biosynthesis of HMAQs, is carried by about one-third of Bcc strains, with considerable inter- and intra-species variability. In the present study, we investigated by PCR, using consensus primers, the distribution of hmqABCDEFG in a collection of 313 Bcc strains (222 of clinical and 91 of environmental origins) - belonging to 18 Bcc species. We confirmed that the distribution is species-specific, although not all strains within a species carry the hmqABCDEFG operon. Among the 30% of strains bearing the hmqABCDEFG operon, we measured the total HMAQs production and showed that 90% of environmental isolates and 68% of clinically isolated Bcc produce detectable levels of HMAQs when cultured in TSB medium. For the strains having the hmqABCDEFG operon but not producing HMAQs, we studied the transcription and showed that none expressed the hmqA gene under the specified culture conditions. Interestingly, the hmqABCDEFG operon is more prevalent among plant root environment species (e.g. B. ambifaria, B. cepacia ) and absent in species commonly found in chronically colonized individuals with cystic fibrosis (e.g. B. cenocepacia, B. multivorans ), suggesting that the Hmq system could play a role in niche adaptation by influencing rhizosphere microbial community and could have been lost through evolution. Understanding the Hmq system and its regulation will provide clues concerning the production of HMAQs and their functions in Bcc." @default.
- W3080345139 created "2020-09-01" @default.
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- W3080345139 date "2020-08-27" @default.
- W3080345139 modified "2023-09-23" @default.
- W3080345139 title "Presence of the Hmq system and production of 4-hydroxy-3-methyl-2-alkylquinolines is heterogeneously distributed between Burkholderia cepacia complex species and more prevalent among environmental than clinical isolates" @default.
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- W3080345139 doi "https://doi.org/10.1101/2020.08.27.269993" @default.
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