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Expanding the zinc-finger recombinase repertoire: Directed evolution and mutational analysis of serine recombinase specificity determinants
KTH, School of Biotechnology (BIO), Protein Technology. Scripps Research Institute, United States .
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2014 (English)In: Nucleic Acids Research, ISSN 0305-1048, E-ISSN 1362-4962, Vol. 42, no 7, 4755-4766 p.Article in journal (Refereed) Published
Abstract [en]

The serine recombinases are a diverse family of modular enzymes that promote high-fidelity DNA rearrangements between specific target sites. Replacement of their native DNA-binding domains with custom-designed Cys 2-His2 zinc-finger proteins results in the creation of engineered zinc-finger recombinases (ZFRs) capable of achieving targeted genetic modifications the flexibility afforded by zinc-finger domains enables the design of hybrid recombinases that recognize a wide variety of potential target sites; however, this technology remains constrained by the strict recognition specificities imposed by the ZFR catalytic domains. In particular, the ability to fully reprogram serine recombinase catalytic specificity has been impeded by conserved base requirements within each recombinase target site and an incomplete understanding of the factors governing DNA recognition. Here we describe an approach to complement the targeting capacity of ZFRs. Using directed evolution, we isolated mutants of the β and Sin recombinases that specifically recognize target sites previously outside the scope of ZFRs. Additionally, we developed a genetic screen to determine the specific base requirements for site-specific recombination and showed that specificity profiling enables the discovery of unique genomic ZFR substrates. Finally, we conducted an extensive and family-wide mutational analysis of the serine recombinase DNA-binding arm region and uncovered a diverse network of residues that confer target specificity these results demonstrate that the ZFR repertoire is extensible and highlights the potential of ZFRs as a class of flexible tools for targeted genome engineering.

Place, publisher, year, edition, pages
2014. Vol. 42, no 7, 4755-4766 p.
Keyword [en]
Catalytic Domain, Directed Molecular Evolution, DNA-Binding Proteins, Genome, Human, Humans, Mutagenesis, Recombinases, Recombination, Genetic, Substrate Specificity, Zinc Fingers
National Category
Biochemistry and Molecular Biology
URN: urn:nbn:se:kth:diva-161680DOI: 10.1093/nar/gkt1389ISI: 000334761100059PubMedID: 24452803ScopusID: 2-s2.0-84899027573OAI: diva2:795527
Swedish Research Council, 623-2009-7281

QC 20150316

Available from: 2015-03-16 Created: 2015-03-13 Last updated: 2015-03-16Bibliographically approved

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