Inactivate an enzyme

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foufoulette
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Inactivate an enzyme

Post by foufoulette » Wed Apr 11, 2012 1:53 am

Hi everyone !

Please, i need your opignon about what i've done. Is it correct to don't inactivate enzyme (phosphatase) after a diphosphatasing of a plasmid and do the next step which is ligation, without inactivation ? is this could affect my results ?

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JackBean
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Post by JackBean » Wed Apr 11, 2012 9:18 am

What do you think? Will the phosphatase do something if you have there plenty of ATP and not-dephosphorylased insert DNA?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

foufoulette
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Re: Inactivate an enzyme

Post by foufoulette » Wed Apr 11, 2012 12:35 pm

The enzyme could do something if the DNA insert is not dephosphorylased, so what shall i do ? cause i don't need to dephosphorylate the insert.

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JackBean
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Post by JackBean » Wed Apr 11, 2012 1:14 pm

You do not only don't need but must not dephosphorylate your insert, because then the DNA ligase won't be able to ligate the fragments together. It needs the phosphate on the DNA strand.
http://www.biolib.cz/en/main/

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Post by foufoulette » Thu Apr 12, 2012 12:01 am

Ok i understand but actually I had inactivated phosphatase in 65°C after ligation and it's correct i think, now i'm waiting for the results !

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JackBean
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Re: Inactivate an enzyme

Post by JackBean » Thu Apr 12, 2012 8:39 am

You must inactivate it before ligation. After ligation is the phosphorylase harmless. :roll:

Expect low yield, if you'll get something at all.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

foufoulette
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Post by foufoulette » Fri Apr 13, 2012 2:01 am

I made transformation and i had colonies but what do you mean by yield ?

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JackBean
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Post by JackBean » Fri Apr 13, 2012 8:06 am

The number of ligated vectors should be lower than if you inactivated the phosphatase. Let us know, if you've got something positive.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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