isolating damaged dna with undam. from e.coli cells

Julie Anne Johnson johns_ja at
Tue May 10 11:01:13 EST 1994

Organization: Homewood Academic Computing, Johns Hopkins University, Baltimore, Md, USA
Keywords:methods of dna isolation, damaged dna 

i am looking for a method to isolate damaged dna along with undamaged
dna from e.coli cells.  The damage is created from gamma irridation
and normal plasmid preps(yes the damaged dna is in a plasmid) isolate
mostly supercoiled dna.  The isolated plasmid dna will then be 
subjected to primer extension so it needs to be fairly pure. Anyone 
have any experience with this? please email me at
johns_ja at thanks a bunch.

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