Proteins and Enzymes

ID #1023

If an R group on an amino acid is charged positive or negative, does the entire amino acid have that charge? Would aspartic acid have a negative charge and lysine have a positive charge?

At physiological pH (about 7), yes. At that pH, the amino group and carboxyl group cancel each other out, so the overall charge of the amino acid comes from the charge of the side chain. You'll take a closer look at amino acids in MCB 250 and see that it's not quite as straight forward as that, but for our purposes it's good enough.

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