Silly Question time.

Richard P Grant rgrant at see.sig.for.address
Fri Jun 13 03:29:15 EST 1997

Given a plasmid digested with a single cutting enzyme, and not
dephosphorylated, is there an *absolute* requirement for ligase to get

If there is ATP in the buffer but no ligase, I was under the impression
that such a plasmid would not self-ligate because it requires the enzyme
to exchange phosphates - at least for a standard 6-base cutter.  (For
longer overlaps it's feasible the cut would be 'seen' by the bugs as 2
single-stranded nicks and therefore would get repaired in the bacterium). 

Please put my mind at rest ;)



Richard P. Grant  MA  DPhil          University of Oxford | rgrant at molbiol  FFPGP                |
-----------------------# Trust me - I'm a doctor. #-----------------------

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