Transformation of E. coli with plasmid

sanjana

Published: 2021-10-16 DOI: 10.17504/protocols.io.byz3px8n

Abstract

This protocol can be used to transform electrocompetent E. coli cells with a plasmid.

Steps

Preparation

1.

Wash cuvette with 100% (v/v) ethanol and UV in the hood for 0h 20m 0s

2.

Pre-thaw electrocompetent cells and plasmid on wet ice for 0h 10m 0s

Electroporation

3.

Add 1µL of plasmid DNA to 50µL electrocompetent cells

4.

Transfer cell-DNA mixture into the cuvette and add equal amount (50µL ) of MilliQ

5.

Let the cuvette sit in wet ice for 0h 20m 0s

6.

Place cuvette in BioRad pulser and pulse at 2.5 keV

7.

Within 0h 0m 40s add 100µL of 2X LB to the cuvette

Incubation

8.

Place cuvette in an incubator at 37°C for 0h 30m 0s

9.

Then use a bent pipette tip to spread the cuvette's contents onto a plate made with LB agar and the appropriate antibiotics. Spread until plate is dry

10.

Place the plate in an incubator at 37°C

11.

Make glycerol stocks of transformed cells and store for future use

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