T5 exonuclease-dependent assembly offers a low-cost method for efficient cloning and site-directed mutagenesis

被引:204
作者
Xia, Yongzhen [1 ]
Li, Kai [1 ]
Li, Jingjing [1 ]
Wang, Tianqi [1 ]
Gu, Lichuan [1 ]
Xun, Luying [1 ,2 ]
机构
[1] Shandong Univ, State Key Lab Microbial Technol, Qingdao 266237, Shandong, Peoples R China
[2] Washington State Univ, Sch Mol Biosci, Pullman, WA 99164 USA
基金
中国国家自然科学基金;
关键词
HOMOLOGOUS RECOMBINATION; DNA FRAGMENTS; LIGATION; COLI;
D O I
10.1093/nar/gky1169
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The assembly of DNA fragments with homologous arms is becoming popular in routine cloning. For an in vitro assembly reaction, a DNA polymerase is often used either alone for its 3-5 exonuclease activity or together with a 5-3 exonuclease for its DNA polymerase activity. Here, we present a T5 exonuclease DNA assembly' (TEDA) method that only uses a 5-3 exonuclease. DNA fragments with short homologous ends were treated by T5 exonuclease and then transformed into Escherichia coli to produce clone colonies. The cloning efficiency was similar to that of the commercial In-Fusion method employing a proprietary DNA polymerase, but higher than that of the Gibson method utilizing T5 exonuclease, Phusion DNA polymerase, and DNA ligase. It also assembled multiple DNA fragments and did simultaneous site-directed mutagenesis at multiple sites. The reaction mixture was simple, and each reaction used 0.04 U of T5 exonuclease that cost 0.25 US cents. The simplicity, cost effectiveness, and cloning efficiency should promote its routine use, especially for labs with a budget constraint. TEDA may trigger further development of DNA assembly methods that employ single exonucleases.
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页数:11
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