DNA cloning tips

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DNA cloning tips - (2010/06/30 (水) 13:45:48) の1つ前との変更点

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I did ligation. However uncountable many colony comes up even in a control plate. I put 400ng cDNA vector. I put 2microg insert. I purified both DNAs. Takara ligation kit ver. 2.1 was used. I enter 6 microl ligation solution, 5microl insert, 1 microl vector. on ice for 5 min. heart shock for 45 sec. on ice for 5 min. Add 400 microl SOC buffer and incubated 30min. plating this solution. The points I doubt.. 1. Exactly KpnI and XhoI works some extent, because the cut insert band is visible. However possibly the ability of cut of enzyme becames lower. So what I have to do is to change enzyme. 2. There a monster of colony both in control and insert plate. I suspect that SOC from Takara is contaminated. I am gonna use LB buffer I prepared. 3. If there is not containing Amp, all of colonies are gonna come up. I am gonna contain Amp in the plate in advance.
30/Jun/2010: I did ligation. However uncountable many colony comes up even in a control plate. (Experimental procedure) I put 400ng cDNA vector. I put 2microg insert. I purified both DNAs. Takara ligation kit ver. 2.1 was used. I enter 6 microl ligation solution, 5microl insert, 1 microl vector. on ice for 5 min. heart shock for 45 sec. on ice for 5 min. Add 400 microl SOC buffer and incubated 30min. plating this solution. The points I doubt.. 1. Exactly KpnI and XhoI works some extent, because the cut insert band is visible. However possibly the ability of cut of enzyme becames lower. So what I have to do is to change enzyme. 2. There a monster of colony both in control and insert plate. I suspect that SOC from Takara is contaminated. I am gonna use LB buffer I prepared. 3. If there is not containing Amp, all of colonies are gonna come up. I am gonna contain Amp in the plate in advance.

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