Invitrogen's pZERO & E.coli with ccdA

Mikhail Alexeyev malexe at
Tue Aug 13 14:31:54 EST 1996

In article <malexe-1308961220250001 at>,
malexe at (Mikhail Alexeyev) wrote:

> In article <4uq75r$hrh at>,
> bsellman at (Bret Sellman) wrote:
> > I have been using the pZERO vector from invitrogen with great success. 
> > The only problem is that the vector is not cheap to buy and I cannot
> > propagate the plasmid without first cutting it and ligating in DNA. 
> > Does anyone know how to propagate this vector?  Are there any E. coli
> > strains available which overexpress ccdA. Thanks.
> In the original article authors used some gyrA (gyrA 401?) mutant to
> propagate plasmids (gyrA96 mutation common to many laboratory strains will
> not do the job). The article has been published in Gene, so strain should
> be available from authors.  I am not aware of any ccdA -overexpressing
> strains, but it should be possible to construct one (the gene is encoded
> by F plasmid -just PCR it out, place under the strong promoter in the
> transposon and shoot it into the chromosome). On the other hand, if lac
> promoter is repressed well on the plasmid, one should be able to propagate
> plasmid in a strain bearing F'. 
> Does Invitrogen still require to sign a peper saying that you are not
> going to attempt to propagate vector without an insert? 
> M.A.

Sorry for self-followup. Just received an August issue of BioTechniques
with an article by Philippe Bernard on the subject. Look at the page 320.


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