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Question about genomic library construction

Steven Goldberg goldberg at bms.com
Thu Feb 27 13:00:43 EST 1997

In article <Pine.GSO.3.95L.970226231323.22311B-100000 at uststf1>, Wilson
<netson at uxmail.ust.hk> wrote:

>         Hello everybody, I have some trouble in my project and ask for
> your suggestion.  I have constructed a genomic library for half year,
> however, I still cannot clone any fraction of insert into the vector with
> high efficiency.  Here is the method I used:  the vector pUC19 digested by
> EcoRI and dephosphorylated by CIP (one hour), the insert was obtained by
> EcoRI digestion of the genomic DNA and the digested DNA was separated by
> eight fraction (the size from 0.5kb to 6.0kb).  The vector and the insert
> was ligated by T4 ligase at R/T for 2 to 4 hours.  After transformation, I
> can find normally ten to twenty colonies from the plate and after
> analysis, only one recombinant can be found from 16 colonies.  The
> ligation efficency is very low, What should I do?
> Wilson  8~O

Get pZeroI or pZeroII from Invitrogen.  You don't have to bother with CIP
treatment and I routinely obtain 90% recombinants.


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