Efficient Genome Manipulation by Variants of Site-Specific Recombinases R and TD

JOURNAL OF MOLECULAR BIOLOGY

卷:428

Article

Voziyanova, Eugenia¹  Anderson, Rachelle P.¹  Shah, Riddhi¹  Li, Feng¹  Voziyanov, Yuri¹ 

[1] Louisiana Tech Univ, Sch Biosci, 1 Adams Blvd, Ruston, LA 71272 USA

关键词: site-specific recombination;    tyrosine recombinases;    genome engineering;    RMCE;    protein engineering;   

DOI  :  10.1016/j.jmb.2015.11.002

来源: Elsevier

【 摘 要 】

Genome engineering benefits from the availability of DNA modifying enzymes that have different target specificities and have optimized performance in different cell types. This variety of site-specific enzymes can be used to develop complex genome engineering applications at multiple loci. Although eight yeast site-specific tyrosine recombinases are known, only Flp is actively used in genome engineering. To expand the pool of the yeast site-specific tyrosine recombinases capable of mediating genome manipulations in mammalian cells, we engineered and analyzed variants of two tyrosine recombinases: R and TD. The activity of the evolved variants, unlike the activity of the native R and TD recombinases, is suitable for genome engineering in Escherichia colt and mammalian cells. Unexpectedly, we found that R recombinase benefits from the shortening of its C-terminus. We also found that the activity of wild-type R can be modulated by its non-consensus head sequence but this modulation became not apparent in the evolved R variants. The engineered recombinase variants were found to be active in all recombination reactions tested: excision, integration, and dual recombinase-mediated cassette exchange. The analysis of the latter reaction catalyzed by the R/TD recombinase pair shows that the condition supporting the most efficient replacement reaction favors efficient TD-mediated integration reaction while favoring efficient R-mediated integration and deletion reactions. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

Free