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Answer on Biochemistry Question for Karolina

Question #1136
What is pI? How the knowledge of the pI of a protein enables characterisation of the protein?
Expert's answer
At a pH below their pI, proteins carry a net positive charge; above their pI they carry a net negative charge.
Proteins can be characterized according to their isoelectric point on a polyacrylamide gel using isoelectric focusing, which uses a pH gradient to separate proteins. Isoelectric focusing is also the first step in 2-D gel polyacrylamide gel electrophoresis.

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