Blunt End Concatemerization

[Jose de las Heras]

"Ozan Aygun" <metugenetics from yahoo.com> wrote in message 
news:mailman.90.1210805268.3533.methods from net.bio.net...
> Dear all,
>
> I have annealed two complementary 20nt oligos to give
> a blunt end fragment and would like to concatemerize
> it to give a tandem copies of >15 fragments. I have
> tried Roche T4 ligase without any success with
> standard buffer conditions in a 50ul volume.
>
> Do you have any alternative suggestions?
>
> Many thanks,
>
> Ozan

Are the oligos phosphorylated?
usually you will get dephosphorylated oligos, unless you ask specifically, 
and these won't ligate.

Jose