ArticleNucleic acids research2026
In vitro properties of large serine integrase hybrids derived from ϕC31 and TG1 integrases.
Article in Nucleic acids research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Phage-derived serine integrases are site-specific recombinases from the large serine recombinase (LSR) family that catalyse precise DNA rearrangements. Their high specificity and unidirectional activity make them attractive tools for genome engineering and synthetic biology. However, their strict sequence requirements limit application to predefined target sites. Here, we report in vitro activities of hybrid integrases derived from ϕC31 and TG1 integrases that efficiently recombine hybrid attP × attB substrates while preserving interaction with the cognate recombination directionality factor (RDF) via the TG1-derived coiled-coil domain. These hybrid recombinases retain site discrimination and catalyse attL × attR recombination exclusively in the presence of the appropriate RDF, indicating preserved directionality control. Analysis of the activities of hybrid integrases across a panel of hybrid substrates highlight the importance of DNA-binding domains-att site recognition motifs in governing specificity. This study presents a modular framework for engineering programmable serine integrases with tailored specificity. Combined with structural prediction tools and expanded LSR discovery and characterization, this strategy holds promise for rational design of recombinases targeting custom genomic sites.
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