Impossible PCR product cloning

[arash arashkia]

I am trying to clone in pcDNA3.1(+), a 100bp PCR product (BamHI/EcoRI treated at the ends), after purification with PCR Product purification kit (Roche). Although the yield decreases after purification, I can see my band in gel electrophoresis.( 100bp is about in cut-off of the purification kits). 5 times try to clone have failed. Has anyone an idea or protocol in this regard?
   
  B.R.
   
  Arash

			
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