Abstract
Serine-type phage integrases catalyze unidirectional site-specific recombination between the attachment sites, attP and attB, in the phage and host bacterial genomes, respectively; these integrases and DNA target sites function efficiently when transferred into heterologous cells. We previously developed an in vivo site-specific genomic integration system based on actinophage TG1 integrase that introduces ∼2-kbp DNA into an att site inserted into a heterologous Escherichia coli genome. Here, we analyzed the TG1 integrase-mediated integrations of att site-containing ∼10-kbp DNA into the corresponding att site pre-inserted into various genomic locations; moreover, we developed a system that introduces ∼10-kbp DNA into the genome with an efficiency of ∼104 transformants/μg DNA. Integrations of attB-containing DNA into an attP-containing genome were more efficient than integrations of attP-containing DNA into an attB-containing genome, and integrations targeting attP inserted near the replication origin, oriC, and the E. coli “centromere” analogue, migS, were more efficient than those targeting attP within other regions of the genome. Because the genomic region proximal to the oriC and migS sites is located at the extreme poles of the cell during chromosomal segregation, the oriC–migS region may be more exposed to the cytosol than are other regions of the E. coli chromosome. Thus, accessibility of pre-inserted attP to attB-containing incoming DNA may be crucial for the integration efficiency by serine-type integrases in heterologous cells. These results may be beneficial to the development of serine-type integrases-based genomic integration systems for various bacterial species.
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Acknowledgments
We thank M. Kyono for technical support. This work was supported by the 22nd Kato Memorial Bioscience Foundation, A-step feasibility study program AS231Z03071E from Japan Science and Technology Agency, and a Grant-in-Aid for Young Scientists (B) 22760612 and the Matching Fund Subsidy for Private Universities from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
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Muroi, T., Kokuzawa, T., Kihara, Y. et al. TG1 integrase-based system for site-specific gene integration into bacterial genomes. Appl Microbiol Biotechnol 97, 4039–4048 (2013). https://doi.org/10.1007/s00253-012-4491-4
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DOI: https://doi.org/10.1007/s00253-012-4491-4