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Herisse M, Porter JL, Guerillot R, Tomita T, Goncalves Da Silva A, Seemann T, Howden BP, Stinear TP, Pidot SJ. The ΦBT1 large serine recombinase catalyzes DNA integration at pseudo- attB sites in the genus Nocardia. PeerJ 2018; 6:e4784. [PMID: 29740520 PMCID: PMC5937489 DOI: 10.7717/peerj.4784] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Accepted: 04/27/2018] [Indexed: 12/17/2022] Open
Abstract
Plasmid vectors based on bacteriophage integrases are important tools in molecular microbiology for the introduction of foreign DNA, especially into bacterial species where other systems for genetic manipulation are limited. Site specific integrases catalyze recombination between phage and bacterial attachment sites (attP and attB, respectively) and the best studied integrases in the actinomycetes are the serine integrases from the Streptomyces bacteriophages ΦC31 and ΦBT1. As this reaction is unidirectional and highly stable, vectors containing phage integrase systems have been used in a number of genetic engineering applications. Plasmids bearing the ΦBT1 integrase have been used to introduce DNA into Streptomyces and Amycolatopsis strains; however, they have not been widely studied in other actinobacterial genera. Here, we show that vectors based on ΦBT1 integrase can stably integrate into the chromosomes of a range of Nocardia species, and that this integration occurs despite the absence of canonical attB sites in these genomes. Furthermore, we show that a ΦBT1 integrase-based vector can insert at multiple pseudo-attB sites within a single strain and we determine the sequence of a pseudo-attB motif. These data suggest that ΦBT1 integrase-based vectors can be used to readily and semi-randomly introduce foreign DNA into the genomes of a range of Nocardia species. However, the precise site of insertion will likely require empirical determination in each species to avoid unexpected off-target effects.
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Affiliation(s)
- Marion Herisse
- Department of Microbiology and Immunology at the Doherty Institute, University of Melbourne, Melbourne, VIC, Australia
| | - Jessica L Porter
- Department of Microbiology and Immunology at the Doherty Institute, University of Melbourne, Melbourne, VIC, Australia
| | - Romain Guerillot
- Department of Microbiology and Immunology at the Doherty Institute, University of Melbourne, Melbourne, VIC, Australia
| | - Takehiro Tomita
- Microbiological Diagnostic Unit, University of Melbourne, Melbourne, VIC, Australia
| | - Anders Goncalves Da Silva
- Department of Microbiology and Immunology at the Doherty Institute, University of Melbourne, Melbourne, VIC, Australia.,Microbiological Diagnostic Unit, University of Melbourne, Melbourne, VIC, Australia
| | - Torsten Seemann
- Department of Microbiology and Immunology at the Doherty Institute, University of Melbourne, Melbourne, VIC, Australia.,Microbiological Diagnostic Unit, University of Melbourne, Melbourne, VIC, Australia
| | - Benjamin P Howden
- Department of Microbiology and Immunology at the Doherty Institute, University of Melbourne, Melbourne, VIC, Australia.,Microbiological Diagnostic Unit, University of Melbourne, Melbourne, VIC, Australia.,Doherty Applied Microbial Genomics, University of Melbourne, Melbourne, VIC, Australia
| | - Timothy P Stinear
- Department of Microbiology and Immunology at the Doherty Institute, University of Melbourne, Melbourne, VIC, Australia.,Microbiological Diagnostic Unit, University of Melbourne, Melbourne, VIC, Australia.,Doherty Applied Microbial Genomics, University of Melbourne, Melbourne, VIC, Australia
| | - Sacha J Pidot
- Department of Microbiology and Immunology at the Doherty Institute, University of Melbourne, Melbourne, VIC, Australia
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