high molecular plasmid DNA

Dr. Hiranya S. Roychowdhury via methods%40net.bio.net (by hroychow from nmsu.edu)
Thu Jan 10 22:09:51 EST 2008

Well, this has never been suficiently explained, nor do I know of any
specific investigation into this.  I tend to believe that the high MW
species may exist as a complex of bacterial chromosome and other proteins.
 Usually, a clean plasmid prep does not show the HMW bands.  It also has
nothing to do with the conc. of the agarose gel.

>> Hello everyone
>> Does anyone know why in some cases we see (in an 0,8% agarose gel)
>> plasmid DNA higher than chromosomal DNA?
>> I know that there are very large plasmids but it is possible to
>> exist a plasmid bigger than the chromosome? I thought it wasn't
>> possible.
>> I thought that is a characteristic of the separation of the agarose
>> gels but if this is the case, how can we explain it?
>> Looking forward to hear from you something
>> Best wishes
>> bio
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Hiranya S. Roychowdhury, Ph.D.
Asst. Professor,
Health & Public Services
Dona Ana Community College
New Mexico State University
Las Cruces, NM 88003

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