Gene replacement in E. coli

Philip Heacock pheacock at
Wed Dec 20 10:10:22 EST 1995

In article <glarson-191295121010 at>, glarson at
(Garry P. Larson) wrote:

> I would like to test the phenotype of coli strain bearing a mutation in a
> non-essential chromosomal gene.  Therefore, what's the simplist way to do a
> knock-out gene replacement in E. coli?  Do I have to use some vectors with
> the Mob gene or (if so, could you contact me so I may use it)À
> Alternatively, can I  utilize an approach taken from my yeast experiences?
> Can I just take my cloned "gene-de-jour", place a Kan (or equivalent)
> cassette into it, then transform my strain with a linear fragment
> containing the resistance cassette flanked by a reasonable (200-500bp+) of
> homology on either side of the cassette and finally  select for drug
> resistance?  I've essentially done a similar  approach (w/o the drug
> cassette) in yeast to mutate a gene on a plasmid.  Seems like it should
> work or am I dreaming?
> Any refs for the techniques would also be greatly appreciated.
> Thank you
> GLarson 

Try the method referenced in, The journal of Bacteriology, vol 175 #13
pages 4260-62. The title is "Simple Phagmid-Based System for Generating
Allele Replacement in Eschericia coli" by Steven Slater and Russell

-Phil Heacock

Medical School
Dept of Biochemistry and Molecular Biology

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