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Plasmid DNA extraction | Plasmid DNA extraction | ||
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DNA electrophoresis | DNA electrophoresis | ||
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Ligation | Ligation | ||
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Generate competent cells | Generate competent cells | ||
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Heat-shock transformation | Heat-shock transformation | ||
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Electrocompetent cells | Electrocompetent cells | ||
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Electroporation and transposition | Electroporation and transposition | ||
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Triparental mating | Triparental mating | ||
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PCR (iPfu<sup>®</sup>) | PCR (iPfu<sup>®</sup>) | ||
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Digestion (NEB enzymes) | Digestion (NEB enzymes) | ||
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Site-directed mutagenesis using overlap extension PCR | Site-directed mutagenesis using overlap extension PCR | ||
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Dilution series-based growth curves | Dilution series-based growth curves | ||
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Beta-galactosidase assay | Beta-galactosidase assay | ||
</p> | </p> |
Revision as of 16:44, 4 October 2016
PROTOCOLS
Plasmid DNA extraction
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Collect the saturated bacteria culture in a 1'5 mL tube and centrifuge at 13000 rpm for 1 minute. Do it twice
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Add 100 μL of GTE (Tris HCl 25 mM, pH 8, glucose 50 mM, EDTA 10 mM), mix by inverting and incubate on ice for 5 minutes
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Add 150 μL of potassium acetate 3 M (pH 4'8), mix by inverting and incubate on ice for at least 5 minutes
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Centrifuge the tubes at 13000 rpm for 10 minutes and transfer the supernatant to a 1'5 mL tube
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Add 400 μL of ice ethanol 96% and centrifuge at 13000 rpm for 10 minutes
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Discard the supernatant, add 500 μL of ethanol 70% and centrifuge at 13000 rpm for 5 minutes
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Let the tubes dry and resuspend the plasmid DNA in 50 μL of TER (TrisHCl 10 mM, pH 8, EDTA 1 mM, RNAse 20 mg L -1)
DNA electrophoresis
GEL MAKING
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Prepare 40 or 100 mL of TAE (Trisacetate 40 mM, pH 7’7, EDTA 10 mM), it depends on the size of the gel
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Add 0’4 g or 1 g of agarose to the TAE solution (for 1% gel)
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Heat the solution until all the agarose has been dissolved and cold it to 50ºC
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Pour the the solution in the electrophoresis vessel, apply the combs and let it polymerize
GEL RUNNING
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Add 1 μL of loading buffer 6x (TrisHCl 5 mM, pH 8, EDTA 0’5 mM, glycerol 30%, xylene cyanol 2’5 g L -1, bromophenol blue 2’5 g L -1) to 5 μL of DNA sample
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Remove the combs from the gel, put the vessel on a horizontal electrophoresis system and cover it with TAE
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Pipette 6 μL of the DNA samples and ladder
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Run at 120 mV for 45 minutes approximately
REVEAL THE GEL
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Put the gel in ethidium bromide for 20 minutes
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Look the gel on the transilluminator and take a photo of it
Ligation
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Add 6 μL of insert DNA
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Add 1 μL of vector DNA
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Add 2 μL of ligase buffer high ATP (TrisHCl 50 mM, pH 7’6, MgCl 2 10 mM, DTT 5 mM, BSA 50 μg mL -1)
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Add 1 μL of T4 DNA ligase
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Incubate at 16ºC overnight
Generate competent cells