Assigning ecological roles to the populations belonging to a phenanthrene-degrading bacterial consortium using omic approaches

• Published in: PloS one Vol. 12; no. 9; p. e0184505
• Main Authors: Festa, Sabrina, Coppotelli, Bibiana Marina, Madueño, Laura, Loviso, Claudia Lorena, Macchi, Marianela, Neme Tauil, Ricardo Martin, Valacco, María Pía, Morelli, Irma Susana
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 08.09.2017; Public Library of Science (PLoS)
• Subjects: Bacteria; Bacteria - classification; Bacteria - genetics; Bacteria - metabolism; Biodegradation; Biodegradation, Environmental; Biology and Life Sciences; Bioremediation; Burkholderia; Catechol; Chromosome 1; Cleavage; Consortia; Contaminants; Degradation; Deoxyribonucleic acid; DNA; DNA, Bacterial - genetics; Gene Order; Genes; Genes, Bacterial; Genomes; Medicine and Health Sciences; Metabolism; Metagenome; Metagenomics - methods; Methods; Microbial Consortia; Microorganisms; Phenanthrene; Phenanthrenes - metabolism; Phylogeny; Polycyclic aromatic hydrocarbons; Populations; Proteins; Proteomics; Proteomics - methods; Scaffolds; Sequence Analysis, DNA; Social Sciences; Soil contamination; Soil Microbiology
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0184505

The present study describes the behavior of a natural phenanthrene-degrading consortium (CON), a synthetic consortium (constructed with isolated strains from CON) and an isolated strain form CON (Sphingobium sp. AM) in phenanthrene cultures to understand the interactions among the microorganisms present in the natural consortium during phenanthrene degradation as a sole carbon and energy source in liquid cultures. In the contaminant degradation assay, the defined consortium not only achieved a major phenanthrene degradation percentage (> 95%) but also showed a more efficient elimination of the intermediate metabolite. The opposite behavior occurred in the CON culture where the lowest phenanthrene degradation and the highest HNA accumulation were observed, which suggests the presence of positive and also negative interaction in CON. To consider the uncultured bacteria present in CON, a metagenomic library was constructed with total CON DNA. One of the resulting scaffolds (S1P3) was affiliated with the Betaproteobacteria class and resulted in a significant similarity with a genome fragment from Burkholderia sp. HB1 chromosome 1. A complete gene cluster, which is related to one of the lower pathways (meta-cleavage of catechol) involved in PAH degradation (ORF 31-43), mobile genetic elements and associated proteins, was found. These results suggest the presence of at least one other microorganism in CON besides Sphingobium sp. AM, which is capable of degrading PAH through the meta-cleavage pathway. Burkholderiales order was further found, along with Sphingomonadales order, by a metaproteomic approach, which indicated that both orders were metabolically active in CON. Our results show the presence of negative interactions between bacterial populations found in a natural consortium selected by enrichment techniques; moreover, the synthetic syntrophic processing chain with only one microorganism with the capability of degrading phenanthrene was more efficient in contaminant and intermediate metabolite degradation than a generalist strain (Sphingobium sp. AM).