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two step digestion


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6 replies to this topic

#1 roshanbernard

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Posted 24 June 2009 - 09:42 PM

can any one provie me the protocol for the two step dna ligation....
thank you

#2 pcrman

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Posted 25 June 2009 - 06:23 PM

two step ligation or digestion? For either of them, I am unware of any two step protocol.

#3 microgirl

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Posted 26 June 2009 - 05:05 AM

Do you mean digesting with two different restriction enzymes?

#4 T C

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Posted 27 June 2009 - 09:20 PM

for sequential digestion:

Add 1 volume NaOAc 3M, pH 5.2 to the digest and 6 volumes ethanol, keep for 2 hrs at -20, spin, wash with 70 % ethanol, dry

You have precipitated yr singly digested DNA, now setup the second digestion.

Best,
TC

#5 HomeBrew

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Posted 28 June 2009 - 05:15 AM

You'd need to recover the product of the first ligation (linear molecule of size vector + insert) from a gel, and then use this in a second dilute ligation to maximize intramolecule ligation.

#6 Qundo12

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Posted 28 June 2009 - 07:16 PM

You'd need to recover the product of the first ligation (linear molecule of size vector + insert) from a gel, and then use this in a second dilute ligation to maximize intramolecule ligation.

Base on the original post of roshanbernard, he gave a link for an article about 2 step ligation. I read the abstract, they mentioned using the high molar concentration for the first step, then dilute the mixture to lowering the concentration because after the 2 ends of vector and insert are ligated, the remaining step is the self ligation of the hybrid plasmid, this step prefers low molar concentration. I can't find the detail, but i think the overall scheme is right.

#7 analynsarte

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Posted 28 June 2009 - 10:56 PM

can any one provie me the protocol for the two step dna ligation....
thank you

you mean dna ligation?
kindly check this site http://ivaan.com/protocols/131.html or this site
http://de.answers.ya...08100419AAgQy5G
i believe this can help a lot in what you've searching for..

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