3'-specificity of Taq

bbeitzel at biomail.ucsd.edu bbeitzel at biomail.ucsd.edu
Mon Dec 8 12:51:40 EST 1997

A couple of years ago I contacted Perkin-Elmer Tech support with
basically the same question.  They sent me a paper looking at the 3'
primer end requirements (I forget where it was published.)  From that
paper, it looked like the matching requirements depended upon the base
composition, ie. a T could pair (mispair) with anything without affecting
amplification.	The other bases weren't as promiscuous as T.  If you
contact P-E tech support, they may be able to send you the article.

Hope this helps,
Brett Beitzel
bbeitzel at biomail.ucsd.edu

In article <3486868F.2D21 at gwdg.de>,
  "Dr. V. Blaschke" <vblasch at gwdg.de> wrote:
> Dear fellow researchers,
> I think it is well established that Taq processivity in PCR depends on
> tight 3'-binding of primers. Does anyone know exactly how many
> mismatches at the 3'-end are necessary to completely abolish Taq
> activity, i.e. would a 24-mer primer with a perfect overall match except
> for a total mismatch of the three last 3'-bases work in PCR or not?
> Any suggestions?
> Thanks,
>    Volker

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