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What is the purpose of buffer in a PCR

About microscopic forms of life, including Bacteria, Archea, protozoans, algae and fungi. Topics relating to viruses, viroids and prions also belong here.

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What is the purpose of buffer in a PCR

Postby vinodpaul » Thu Mar 03, 2011 5:17 am

Hi,I would like to know what is the purpose of adding a buffer solution and Mg+ in PCR. Can someone please help me.
Thanks. :)
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Postby JackBean » Thu Mar 03, 2011 7:02 am

every enzyme requires some conditions in means of pH, ionic strength, present cofactors etc. That you get by adding the buffer to the reaction mixture. In some cases, the enzyme may even shift pH in non-buffered solution and thus it would stop working, but adding buffer prevents that also.

So, by adding the buffer to PCR reaction you get the optimal pH and Mg2+ is required as cofactor as by most NTP-binding proteins (look into some book for properties of DNA Pol)
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Re: What is the purpose of buffer in a PCR

Postby protold » Thu Mar 03, 2011 7:08 am

Hola, It´s to be sure that the enzyme works in the best conditions. For instance the taq , Pfu polimerases had an optimun pH about 8 and required an specific Mg conc. if you made your pcr at pH 6 without Mg the result could be no amplification because the residual activity of enzyme would be innefficient tp amplify the wished band. Buena suerte
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Postby vinodpaul » Fri Mar 04, 2011 1:01 pm

Thank you
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