Biology Forum › Molecular Biology › Molecular biology
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- March 14, 2011 at 1:48 pm #14660
maheshgenParticipantI have a problem in restricting pET-28a(+) and pET-28b(+) vectors with NcoI and XhoI. I have tried Fermentas enzymes with buffer Tango. I tried many times but went invein. Can anybody guide me in this as I am in desperate need of this vector to proceed my work. Thank you in advance for the advice
- March 14, 2011 at 8:27 pm #103905JackBeanParticipant
they seem fine, both Fermentas and NEB Enzymes show they should work fine in wide range of buffers, so that shouldn’t be a problem. What about other conditions? How do you check the result? Where did you get the plasmid?
- March 14, 2011 at 9:22 pm #103908maheshgenParticipantquote JackBean:they seem fine, both Fermentas and NEB Enzymes show they should work fine in wide range of buffers, so that shouldn’t be a problem. What about other conditions? How do you check the result? Where did you get the plasmid?
Thanks jackBean for reply. The enzymes are working. We have pET-28 a-c (+) vectors in our lab. I tried to restrict with XhoI and NcoI seperately but nothing seen on gel. I tried even EcoRI, BamHI, and HindIII but didnt restrict. I dont understand where is the problem. I tried to isolate fresh plasmid but no results. I even tried different concentrations of buffer and enzyme. But before i didnt experience such problems.
- March 15, 2011 at 9:50 am #103911JackBeanParticipant
seems rather like problem with the vector. How did you check you have really the vector you want? How was your DNA purification?
Are you sure the vector is as from manufacturer, wasn’t it cut already in the past? - March 15, 2011 at 10:51 am #103912maheshgenParticipantquote JackBean:seems rather like problem with the vector. How did you check you have really the vector you want? How was your DNA purification?
Are you sure the vector is as from manufacturer, wasn’t it cut already in the past?we use these vectors and they all function well. Even i cut these before without any difficulty. But now something strange is happening. I put these vectors side by side with pUC19 plasmid and found that its very bigger on the gel compared to pUC19.
mahesh, UK, Bratislava
- March 15, 2011 at 11:49 am #103913JackBeanParticipant
UK, Bratislava? 😆 To zní zajímavě 🙂
Then you should find out, what’s going on, you probalby have the vector with some insert, probably in place of your restriction sites
- April 1, 2011 at 12:30 pm #104264RichardvanLeeuwenParticipant
I had the same problem with digestion of pET28a(+) with BamHI/XhoI. Also I used Fermentas RE and obtained more bands then expected. By using the FastDigest RE from Fermentas I was able to obtain the correct bands.
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