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John M. S. Bartlett.pdf - Bio-Nica.info

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520 Jones and Winistorfer<br />

Fig. 2. Diagram illustrating site-directed mutagenesis of two distal sites using recombination<br />

PCR. The primers are numbered hemiarrows. Asterisks designate the mutagenesis sites. There<br />

is no purification of the PCR products. Notches designate point mismatches in the primers and<br />

resulting mutations in the PCR products. Reprinted by permission from Technique 2, 273–278.<br />

4. Visualize the PCR product on an agarose minigel. If 5 µL of the PCR product can be clearly<br />

seen following ethidium bromide staining (>15 ng/5 µL), there is enough product.<br />

5. Withdraw 2.5 µL from each PCR tube (typically 10–60 ng/2.5 µL) and then combine the<br />

two samples. If the PCR template is linearized by restriction endonuclease digestion outside<br />

the region to be amplified, no purification of PCR products is necessary (see Note 5).<br />

6. Transform MAX efficiency competent E. coli (BRL) with the 5-µL sample containing the two<br />

PCR products. Maintaining an even molar ratio of one product to another is not necessary.<br />

Transformation is carried out following the manufacturer’s instructions with the following<br />

modifications:

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