The pI of a protein is 6.5. Which of the following buffers should be used so that the protein could bind to a cation exchange column for purification
Question
The pI of a protein is 6.5. Which of the following buffers should be used so that the protein could bind to a cation exchange column for purification?
Solution
To bind a protein to a cation exchange column, the protein must have a positive charge. The charge of a protein is determined by the pH of the solution it is in relative to the protein's isoelectric point (pI). At a pH below its pI, a protein will carry a net positive charge.
The pI of the protein in question is 6.5. Therefore, to ensure that the protein carries a net positive charge, a buffer with a pH less than 6.5 should be used.
So, when choosing a buffer, look for one with a pH less than 6.5. This will ensure that the protein can bind to the cation exchange column for purification.
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