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Construction of Ms6 derivative mutants as tools for interaction studies ith mycobacteria

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Resumo:Mycobacteriophage Ms6 is a temperate phage isolated in 1989 from a spontaneously induced culture of Mycobacterium smegmatis. Although several studies regarding lysis and integration have been published, the host range of Ms6 is not known. In this work we observed that incubation of this phage with fast- and slow-growing mycobacteria did not result in plaque or halos formation, as usually happens in infection plaque assay. However, an absence of clearing in a bacterial lawn does not mean that Ms6 in unable to infect the tested mycobacteria apart from its natural host, M. smegmatis. Taking this into consideration, our main goal was to construct Ms6 derivative mutants with reporter genes, and use them as tools to follow the mycobacteriophage replication inside other mycobacteria. Using the Bacteriophage Recombineering of Electroporated DNA (BRED) technique, we successfully constructed two Ms6 derivative reporter phages, Ms6lysB::egfp and Ms6pin::gfpm2+, by gene replacement. We successfully showed that their reporter proteins, improved green fluorescent proteins (GFP), are respectively expressed in Ms6 lytic and lysogenic life cycle, on M. smegmatis. Consequently, these new mutant phages are very important and useful tools to be used in future studies since they permit to follow a lytic or lysogenic cycle. With Ms6lysB::egfp and Ms6pin::gfpm2+, we expect to determine with more accuracy the ability of Ms6 to infect/replicate in other mycobacteria.
Autores principais:Pombo, Sofia Pires de Oliveira
Assunto:Recombineering Mycobacteriophage Ms6 Ms6lysB::egfp Ms6pin::gfpm2+ Mycobacteria GFP Teses de mestrado - 2015
Ano:2015
País:Portugal
Tipo de documento:dissertação de mestrado
Tipo de acesso:acesso aberto
Instituição associada:Universidade de Lisboa
Idioma:inglês
Origem:Repositório da Universidade de Lisboa

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