I canīt obtain the amount of DNA required for ligation of blunt ends - (Apr/24/2012 )
Hi, my english is not so good, I hope can explain correctly.
I'm trying to subclone expression cassette (3392 bp) of pHANNIBAL to pCAMBIA. I make digestions to pHANNIBAL with Not I to liberate the insert and pCAMBIA with EcoR I to to linearize the vector approximately 3 micrograms of DNA. After the digested mixture is added Klenow for fill-in reaction according indications of invitrogen which found that terminate fill-in reaction by phenol extraction.
Did you solved your problem. Because I am also facing similar problem in my cloning expriment. could you please let me know any interesting trouble shooted points we must taken care(while doing purification/etc) to increase yield.?
You are obviously losing the majority of your sample in the digest/fill-in/extraction. The simplest solution is start with a much higher amount of vector (~10ug). I have observed similar problems when doing a fill-in reaction after a digest. I gel purify my samples instead of phenol extraction for what is worth.
What I find really saves time and effort is finding a way to do sticky end cloning. Just make sure this is not an option before continuing.