3 prime fill in reaction?

[Peter Ashby]

In article 
<Pine.SOL.4.33.0109261515090.22413-100000 at mcmail.cis.mcmaster.ca>,
 Kyle Legate <legatek at mcmail.cis.mcmaster.ca> wrote:

> Michael's correct. Since DNA polymerization proceeds 5'->3' there is no
> way to fill in the BsrD1 restriction product, as this would necessitate
> 3'->5' polymerization. T4 polymerase (and unmodified Klenow fragment)
> possess 3'->5' exonuclease activity, which is why you see your end being
> chewed away.

yep, that's I thought thanks for confirming it. We'll either revert to 
pcr or custom linker and recut.

Thanks
Peter

-- 
Peter Ashby
Wellcome Trust Biocentre
University of Dundee
Dundee, Scotland
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