Note that some of these problems refer to information presented in the Tools of Biochemistry 5A-D.
You have discovered a novel protein that has a pI = 5.5. To study the functional properties of this new protein, your research group has made a mutant that contains two amino acid changes: a surface phenylalanine residue in the normal protein has been replaced by histidine (side chain pKa= 6.1), and a surface glutamine has been replaced by glutamic acid (side chain pKa = 6.0). Is the pI of the. mutant protein predicted to be greater than, less than, or the same as the pI of normal protein? Support your answer with the appropriate calculation.
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