Bacterial Plasmids

[lars]

Dear Andreas,
Well, it depends a lot on the bacterial species and on the sizes of the
plasmids you want to isolate (and what you would like to do with these
plasmids).

We have used a very simple method to visualize large plasmids from
various Bacilli; Bacilli are relatively tough to disrupt and the large
plasmids have to be handled with care. A single nick in one DNA strand
turns the plasmid into the open circle conformation which do not enter
an agarose gel (plasmids > 20 kbp). However, the purity of the plasmids
are not suitable for enzymatic digests etc.

A free PDF-version of the article can be seen at:

http://jb.asm.org/cgi/reprint/177/10/2914?view=reprint&pmid=7751306

Yours

Lars



Andreas Toba wrote:
> 
> Hello!
> 
> This is the first time I write to a newsgroup.
> 
> Here is my problem
> 
> I'm working with several natural occuring bacteria. I'm trying to isolate
> their plasmids, it's very difficult. I'm using Birnboin & Dolly and Kado &
> Liu protocols, sometimes those protocols don't work. Does anyone knows other
> protocols for isolate natural plasmids?
> 
> Thanks in advance
> excuse my english, please.
> 
> Andreas Toba
> from Caracas Venezuela (Universidad Central de Venezuela, Instituto de
> Biología Experimental)

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