Codon-optimized FLP (FLPo) and eGFP Adenovirus (Ad-GFP-FLPo)

FLP from Saccharomyces cerevisiae, a site-specific recombinases (SSR) from the λ integrase family, recognizes distinct 34 bp FRT sites. It has been widely used for generating conditional knockout mice, mediated by FLP/FRT system. Initial use of FLP in mammalian cells revealed inefficient recombinase activity due to thermo-instability of the FLP protein. Subsequent screening for thermo-stable mutants resulted in the identification of FLPe, with a 4-fold increase in recombination efficiency at 37C. However the recombination efficiency of FLPe in cells remains very low because of its non-mammalian origin. This mouse codon optimized FLPe greatly increase the recombination efficiency in mouse cells.This adenovirus express a mouse codon-optimized FLP recombinase (FLPo), along with an eGFP marker. FLPo and eGFP are driven by the same CMV promoter and separated by a 2A peptide.