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ABSTRACT: Phenanthrene Lignite Anaerobic Cometabolic Biodegradation

PROVIDER: PRJNA504455 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8175123_1.fastq.gz	Fastqsanger.gz
	SRR8175123_2.fastq.gz	Fastqsanger.gz

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Genome and transcriptome analysis of the lignite-degrading Trichoderma cf. simile WF8 strain highlights potential degradation mechanisms

Project description:The biodegradation of lignite (brown coal) by microorganisms has the potential for bioremediation of contaminated mining sites and to generate alternative ways to valorize lignite, such as by producing humic acids or building block chemicals. Previously, a lignite-degrading strain of Trichoderma was isolated, but the genomic and transcriptomic basis of its lignite-degrading ability remained unknown. Here we report that the sequenced genome of the T. cf. simile WF8 strain encoded for enzymes with roles in the degradation of lignite, and potentially tolerance to lignite-breakdown products. There was only a small number of annotated unique genes in the T. cf. simile WF8 genome compared to other fungi, and likely the expression of gene families shared with other fungi is a key factor in lignite biosolubilization by T. cf. simile. The transcriptomes were analyzed of T. cf. simile cultured at two time-points with the lignite-breakdown model compounds 4-phenoxybenzoic acid (which was growth inhibitory), and phenetole and 9-10-dibutoxyanthracene (neither of which inhibited growth), and showed ~20% of genes up-regulated by one or more of these compounds. The analysis highlights candidates for characterization and engineering enzyme over-expressing T. cf. simile strains with potentially improved degradation capacity, e.g., laccases and peroxidases, or tolerance and catabolism of breakdown products, e.g., cytochrome P450s, and ring cleavage dioxygenases.

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Project description:Polycyclic aromatic hydrocarbons (PAHs) are widely distributed pollutants. As in saturated PAH-contaminated sites oxygen is rapidly depleted, microorganisms able to use these compounds as a carbon source in the absence of molecular oxygen are crucial for their consumption. Here, we described the metabolic pathway for anaerobic degradation of phenanthrene by a sulfate-reducing enrichment culture (TRIP) obtained from a natural asphalt lake. The dominant organism of this culture belongs to the Desulfobacteraceae family of deltaproteobacteria. Proteogenome analysis revealed that the metabolic capacity of this bacterium includes the key enzymes for dissimilatory sulfate reduction, the Embden-Meyerhof-Parnas pathway, a complete tricarboxylic acid cycle as well as the key elements of the Wood-Ljungdahl pathway. Genes encoding enzymes potentially involved in the degradation of phenanthrene were identified in the genome of this bacterium. Two gene clusters were identified encoding a carboxylase enzyme involved in the activation of phenanthrene, as well as genes encoding reductases potentially involved in subsequent ring dearomatization and reduction steps. The predicted metabolic pathways were corroborated by transcriptome and proteome analyses and provide the first metabolic pathway for anaerobic degradation of three-rings PAHs.

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