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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

Front Agric Chin    2009, Vol. 3 Issue (1) : 43-46     DOI: 10.1007/s11703-009-0010-5
Improvement of megaprimer method for site-directed mutagenesis and its application to phytase
Haiqiang LU1, Hongwei YU1, Runfang GUO1, Yingmin JIA1,2()
1. Food Science and Technology College Agricultural University of Hebei, Baoding 071000, China; 2. Hebei University of Science and Technology, Shijiazhuang 05000,China
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Site-directed mutagenesis is used extensively for probing gene function. In this paper we describe an improved megaprimer method to the site-directed mutagenesis of phytase from Aspergillus niger, which allowed the mutations to be performed more efficiently in less time than other traditional methods. Three rounds of PCR and two pairs of primers were required in this method, and additionally, the restriction enzyme Dpn I was used for the elimination of template instead of the gel purification in this process. The entire procedure was performed in one tube. Moreover, this method was easier for obtaining large mutant genes than other methods. We successfully carried out the site-directed mutagenesis of phytase by adopting this method.

Keywords site-directed mutagenesis      phytase      the single-stranded product      PCR     
Corresponding Authors: JIA Yingmin,   
Issue Date: 05 March 2009
URL:     OR
Fig.1  Schematic diagram of the improved site-directed mutagenesis method
name of primersequence of primers (5'-3')
Tab.1  Primers used in the experiments
Fig.2  Optimization of key parameters and conditions for maximum efficiency of mutagenesis
Note: (a) represents the products generated from the different circulation numbers of the first PCR with 0.05 pmol?L of Primer U’. M represents DNA Marker-D (100-2000 bp). From Lane 1 to Lane 9, the number of cycles is 5, 10, 15, 20, 25, 30, 35, 40 and 45 respectively. (b) represents the effects of different circulation numbers in the first PCR with 0.05pmol?L of Primer U’. M is DNA Marker-D (100-2000 bp). From Lane 1 to Lane 8, the number of cycles is 5, 10, 15, 20, 25, 30, 35 and 40. (c) represents the products generated from the different circulation numbers of the first PCR with 0.025 pmol?L of Primer U’. M is DNA Marker-D (100-2000 bp). From Lane 1 to lane 9, the number of cycles is 5, 10, 15, 20, 25, 30, 35, 40 and 45. (d) represents the effects of the different circulation numbers of the first PCR with 0.025pmol?LPrimer U’. M is DNA Marker-D (100–2000 bp). From Lane 1 to Lane 8, the number of cycles is 5, 10, 15, 20, 25, 30, 35 and 40, respectively.
Fig.3  Comparison of the two methods
Note: Lane a shows the results of the stranded method; Lane b shows the results of the improved method; Lane M shows marker DL2000
gene namemutation sequencemutation frequency
Tab.2  Frequency of the improved megaprimer method mutation
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