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[vgupta]

I have been trying to ligate 400 bp fragment into 10.5 kb vector digested with SalI and dephosphorylated with SAP. But I don't get any colonies. I don't know if Sal I is giving some sort of unexplainable star activity. I have cloned this fragment before in pBluescript after PCR and Sal I digestion. Self ligation before dephosphorylation did work once.  Can any one give me suggestions? Thanks.

[zhenghj]

a 11 kb plasmid is not easy to transform, if u didn't get any clone, it may be the  reason of low transformation efficiency.u'd better prepare a new electroporated competent cell.