title: Optimization of coliphage HK022 Integrase activity in human cells.
abstract: The Integrase (Int) site-specific recombinase of coliphage HK022 catalyzes integrative and excisive DNA recombination between two attachment (att) sites in human cells without the need to supply the accessory proteins Integration Host Factor (IHF) and Excisionase (Xis). Previous work has shown that under these conditions, reactions in cis, i.e. both att sites are located on the same chromosome, can be detected without selection. However, recombination in trans, i.e. one att site positioned on a chromosome and the other on an episomal vector, was detected only after selection. Here we show that optimization of the int-HK022 gene for human codon usage according to the GeneOptimizer software algorithm, as well as addition of accessory proteins IHF and Xis improve the recombination efficiencies in human cells, such that recombinants in a trans reaction could be detected without selection.
authors.affiliation: Department of Biochemistry, Tel-Aviv University, Tel-Aviv 69978, Israel.
authors.forename: Natalia
authors.initials: N
authors.lastname: Malchin
authors.forename: Janna
authors.initials: J
authors.lastname: Goltsman
authors.forename: Lital
authors.initials: L
authors.lastname: Dabool
authors.forename: Rena
authors.initials: R
authors.lastname: Gorovits
authors.forename: Qiuye
authors.initials: Q
authors.lastname: Bao
authors.forename: Peter
authors.initials: P
authors.lastname: Dröge
authors.forename: Ezra
authors.initials: E
authors.lastname: Yagil
authors.forename: Mikhail
authors.initials: M
authors.lastname: Kolot
mesh_terms: D025523:Bacteriophage HK022 / Q000201:enzymology*; D002460:Cell Line; D005821:Genetic Techniques; D006801:Humans; D019426:Integrases / Q000378:metabolism*; D011995:Recombination, Genetic
chemical_list: D019426:Integrases