Polymerase Chain Reaction--热启动PCR

This procedure is a "hot start" PCR cycle for use with large primers. PCR mass-produces DNA contained in the source plasmid between the two primer-binding sequences, eventually producing linear DNA starting with Primer 1, continuing with the source sequence, and ending with the complementary sequence to Primer 2.

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Materials

10 mM dNTP mix [Boehringer Mannheim, cat # 1581 295]
10X PCR Buffer w/ 15 mM MgCl2 [Boehringer Mannheim, cat # 1759 167]
PCR Enzyme: Expand HF PCR System [Boehringer Mannheim, cat # 1732 641]
150 µM Primer 1
150 µM Primer 2
Source plasmid
Mineral oil
Chloroform: ACS Reagent Grade
PCR Thermocycler
Procedure

Prepare Master Mix 1 in a 500 µL tube on ice:
2 µL dNTP solution
2 µL dilute Primer 1 (dilute 1:10 in sterile dH2O)
2 µL dilute Primer 2 (dilute 1:10 in sterile dH2O)
4 µL source plasmid (adjust amount as necessary)
40 µL sterile dH2O
Prepare Master Mix 2 in a 500 µL tube on ice:
10 µL 10X PCR Buffer
0.75 µL PCR Enzyme
39 µL sterile dH2O
Immediately before starting the PCR cycle, add MM2 to MM1; to prevent evaporation, place two drops of mineral oil on top of the solution
Run the following PCR cycle:
First cycle: 5 minutes at 95 °C
Next thirty cycles: 1 minute at 94 °C, 2 minutes at 55°C, 3 minutes at 72 °C
Hold at 4 °C
Add 150 µL of Chloroform to the PCR product to remove mineral oil; gently invert to mix
Transfer the aqueous "bubble" (floating on top) to a fresh 500 µL tube with a gel-loading tip on a 20 µL micropipet
Store PCR Product at -20 °C

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