Mar 31, 2020

Nutritional inter-dependencies and a carbazole-dioxygenase are key elements of a bacterial consortium relying on a Sphingomonas for the degradation of the fungicide thiabendazol

BioRxiv : the Preprint Server for Biology
Rob W NessDimitrios G Karpouzas


Background: Thiabendazole (TBZ), is a benzimidazole fungicide and anthelminthic whose high persistence and toxicity pose a serious environmental threat. In our quest for environmental mitigation we previously isolated the first TBZ-degrading bacterial consortium and provided preliminary evidence for its composition and the degrading role of a Sphingomonas. Here, we employed a multi-omic approach combined with DNA-stable isotope probing (SIP) to determine the genetic make-up of the key consortium members, to disentangle nutritional and metabolic interdependencies, to identify the transformation pathway of TBZ and to understand the genetic network driving its transformation. Results: Time-series SIP in combination with amplicon sequencing analysis verified the key role of Sphingomonas in TBZ degradation by assimilating over 80% of the 13C-labelled phenyl moiety of TBZ. Non-target mass spectroscopy (MS) analysis showed the accumulation of thiazole-4-carboxamidine as a single dead-end transformation product and no phenyl-containing derivative, in line with the phenyl moiety assimilation in the SIP analysis. Time series metagenomic analysis of the consortium supplemented with TBZ or succinate led to the assembly of 18 metagenome-ass...Continue Reading

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