RAY at leicester.ac.uk RAY at leicester.ac.uk
Wed Dec 20 11:45:35 EST 1989

We are trying to design PCR primers which include NotI (or other rare) sites
in the 5' end to allow for cloning the products. So far we have had little
success in activating the ends. New England Biolabs suggest that it is
necessary to have at least 15 bases extra 5' to the NotI site for the enzyme
to be able to cleave the site. It seems rather a lot (=expense) and so I
wondered if anybody knows (for any restriction enzyme - not just NotI) how
close to an end will a restriction enzyme cut. In our experience, EcoRI does
not seem to mind cutting a site that is very close to an end.

What about other enzymes.

Raymond Dalgleish,
Department of Genetics,
University of Leicester.

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