pTopo purification problems

Bari Zahedi via (by bzahedi from
Thu Sep 10 18:48:19 EST 2009

This is very little info. It could be your bugs, your lysis, your amp is off, it could be many things. Can you provide more info. 

To narrow down if the problem is at the plasmid prep level then: 
1)To start, did you also get blue colonies? Can you get any plasmid out of those? This will help determine if there is something wrong with your kits/plasmid prep reagents. 
2)Do you get anything coming out of your preps? Like a smear? If so the problem maybe with your lysis.

-----Original Message-----
From: methods-bounces from [mailto:methods-bounces from] On Behalf Of Yoram Gerchman
Sent: Thursday, September 10, 2009 12:55 PM
To: methods from
Subject: pTopo purification problems

Greetings netters
I have recently made an attempt to clone a short gene into pTopo (using Top10 competent cells). i did get white colonies on LB-Amp-X-gal, and they grew nicely on liquid LB-Amp, but after plasmid purification I get no DNA (tried already 2 different kits). Any ideas as to how remediate this situation?
Many thanks

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