Three novel Pseudomonas phages isolated from composting provide insights into the evolution and diversity of tailed phages

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Amgarten, Deyvid ; Martins, Layla Farage ; Lombardi, Karen Cristina ; Antunes, Luciana Principal ; Silva de Souza, Ana Paula ; Nicastro, Gianlucca Goncalves ; Kitajima, Elliott Watanabe ; Quaggio, Ronaldo Bento ; Upton, Chris ; Setubal, Joao Carlos ; da Silva, Aline Maria

• Tipo de documento: Artigo Científico
• Fonte: BMC Genomics; v. 18, MAY 4 2017.
• Citações Web of Science: 6

Resumo

Background: Among viruses, bacteriophages are a group of special interest due to their capacity of infecting bacteria that are important for biotechnology and human health. Composting is a microbial-driven process in which complex organic matter is converted into humus-like substances. In thermophilic composting, the degradation activity is carried out primarily by bacteria and little is known about the presence and role of bacteriophages in this process. Results: Using Pseudomonas aeruginosa as host, we isolated three new phages from a composting operation at the Sao Paulo Zoo Park (Brazil). One of the isolated phages is similar to Pseudomonas phage Ab18 and belongs to the Siphoviridae YuA-like viral genus. The other two isolated phages are similar to each other and present genomes sharing low similarity with phage genomes in public databases; we therefore hypothesize that they belong to a new genus in the Podoviridae family. Detailed genomic descriptions and comparisons of the three phages are presented, as well as two new clusters of phage genomes in the Viral Orthologous Clusters database of large DNA viruses. We found sequences encoding homing endonucleases that disrupt a putative ribonucleotide reductase gene and an RNA polymerase subunit 2 gene in two of the phages. These findings provide insights about the evolution of two-subunits RNA polymerases and the possible role of homing endonucleases in this process. Infection tests on 30 different strains of bacteria reveal a narrow host range for the three phages, restricted to P. aeruginosa PA14 and three other P. aeruginosa clinical isolates. Biofilm dissolution assays suggest that these phages could be promising antimicrobial agents against P. aeruginosa PA14 infections. Analyses on composting metagenomic and metatranscriptomic data indicate association between abundance variations in both phage and host populations in the environment. Conclusion: The results about the newly discovered and described phages contribute to the understanding of tailed bacteriophage diversity, evolution, and role in the complex composting environment. (AU)

• Processo FAPESP: 14/16450-8 - Análise da diversidade de bacteriófagos associada à comunidade microbiana durante o processo de compostagem
• Beneficiário: Deyvid Emanuel Amgarten
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 15/14334-3 - Phage Orthologous Clusters: Um banco de dados de informações de fagos
• Beneficiário: Deyvid Emanuel Amgarten
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Mestrado
• Processo FAPESP: 11/50870-6 - Estudos da diversidade microbiana no Parque Zoológico do Estado de São Paulo
• Beneficiário: João Carlos Setubal
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático