Functional metagenomics of oil-impacted mangrove sediments reveals high abundance of hydrolases of biotechnological interest

• Published in: World journal of microbiology & biotechnology 2017-07, Vol.33 (7), p.141-141, Article 141
• Main Authors: Ottoni, Júlia Ronzella, Cabral, Lucélia, de Sousa, Sanderson Tarciso Pereira, Júnior, Gileno Vieira Lacerda, Domingos, Daniela Ferreira, Soares Junior, Fábio Lino, da Silva, Mylenne Calciolari Pinheiro, Marcon, Joelma, Dias, Armando Cavalcante Franco, de Melo, Itamar Soares, de Souza, Anete Pereira, Andreote, Fernando Dini, de Oliveira, Valéria Maia
• Format: Article
• Language: English
• Subjects: Abundance; Amylases; Applied Microbiology; Assaying; Assembly; Bacteria - classification; Bacteria - enzymology; Bacteria - genetics; Bacteria - isolation & purification; Bacterial Proteins - genetics; Biochemistry; Biodiversity; Biomedical and Life Sciences; Biotechnology; Brazil; Coastal environments; Coding; Contamination; Cycles; Datasets; Deoxyribonucleic acid; DNA; DNA sequencing; Ecological function; Ecosystems; Environmental DNA; Environmental Engineering/Biotechnology; Enzymes; Epoxide hydrolase; Esterases; Functional anatomy; Genes; Genomic Library; Geologic Sediments - microbiology; High-Throughput Nucleotide Sequencing; Hydrolases - genetics; Incidence; Libraries; Life Sciences; Mangroves; Metagenomics - methods; Microbiology; Microorganisms; Nutrient cycles; Oil pollution; Oil spills; Original Paper; Petroleum Pollution - adverse effects; Phylogeny; Polls & surveys; Sediments; Sequence Analysis, DNA; Soil Microbiology; Transcription; Wetlands; Xylanase
• ISSN: 0959-3993; 1573-0972
• DOI: 10.1007/s11274-017-2307-5

Mangroves are located in coastal wetlands and are susceptible to the consequences of oil spills, what may threaten the diversity of microorganisms responsible for the nutrient cycling and the consequent ecosystem functioning. Previous reports show that high concentration of oil favors the incidence of epoxide hydrolases and haloalkane dehalogenases in mangroves. This finding has guided the goals of this study in an attempt to broaden the analysis to other hydrolases and thereby verify whether oil contamination interferes with the prevalence of particular hydrolases and their assigned microorganisms. For this, an in-depth survey of the taxonomic and functional microbial diversity recovered in a fosmid library ( Library_Oil Mgv ) constructed from oil-impacted Brazilian mangrove sediment was carried out. Fosmid DNA of the whole library was extracted and submitted to Illumina HiSeq sequencing. The resulting Library Oil_Mgv dataset was further compared with those obtained by direct sequencing of environmental DNA from Brazilian mangroves (from distinct regions and affected by distinct sources of contamination), focusing on hydrolases with potential use in biotechnological processes. The most abundant hydrolases found were proteases, esterases and amylases, with similar occurrence profile in all datasets. The main microbial groups harboring such hydrolase-encoding genes were distinct in each mangrove, and in the fosmid library these enzymes were mainly assigned to Chloroflexaceae (for amylases), Planctomycetaceae (for esterases) and Bradyrhizobiaceae (for proteases). Assembly and analysis of Library_Oil Mgv reads revealed three potentially novel enzymes, one epoxide hydrolase, one xylanase and one amylase, to be further investigated via heterologous expression assays.