Integrating vectors for genetic studies in the rare Actinomycete Amycolatopsis marina

• Published in: BMC biotechnology Vol. 19; no. 1; p. 32
• Main Authors: Gao, Hong, Murugesan, Buvani, Hoßbach, Janina, Evans, Stephanie K, Stark, W Marshall, Smith, Margaret C M
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 04.06.2019; BioMed Central; BMC
• Subjects: Actinobacteria - genetics; Actinobacteria - virology; Actinomycetes; Amycolatopsis; Antibiotics; Attachment Sites, Microbiological - genetics; Base Sequence; Cloning; Conjugation; Deoxyribonucleic acid; DNA; DNA sequencing; E coli; Escherichia coli; Gene sequencing; Genetic aspects; Genetic engineering; Genetic vectors; Genetic Vectors - genetics; Genome, Bacterial - genetics; Genomes; Genomics; Homology; Integrases; Integrases - genetics; Integrases - metabolism; Integrating vectors; Laboratories; Loci; Metabolism; Natural products; Phages; Plasmids; R4 integrase; Rare Actinomycetes; Recombination; Recombination, Genetic; Sequence Homology, Nucleic Acid; Streptomyces; TG1 integrase; Vectors; Viral Proteins - genetics; Viral Proteins - metabolism; Integrating vectors; Rare Actinomycetes; R4 integrase; Amycolatopsis; TG1 integrase
• ISSN: 1472-6750; 1472-6750
• DOI: 10.1186/s12896-019-0521-y

Few natural product pathways from rare Actinomycetes have been studied due to the difficulty in applying molecular approaches in these genetically intractable organisms. In this study, we sought to identify more integrating vectors, using phage int/attP loci, that would efficiently integrate site-specifically in the rare Actinomycete, Amycolatopsis marina DSM45569. Analysis of the genome of A. marina DSM45569 indicated the presence of attB-like sequences for TG1 and R4 integrases. The TG1 and R4 attBs were active in in vitro recombination assays with their cognate purified integrases and attP loci. Integrating vectors containing either the TG1 or R4 int/attP loci yielded exconjugants in conjugation assays from Escherichia coli to A. marina DSM45569. Site-specific recombination of the plasmids into the host TG1 or R4 attB sites was confirmed by sequencing. The homologous TG1 and R4 attB sites within the genus Amycolatopsis have been identified. The results indicate that vectors based on TG1 and R4 integrases could be widely applicable in this genus.