Which of the following amino acids have side chains that are negatively charged under physiological conditions?
The side chains of the acidic amino acids, aspaic acid and glutamic acid, are negatively charged above pH 3; in their ionized state, they are often referred to as aspaate and glutamate. Asparagine and glutamine are, respectively, the amides of aspaic acid and glutamic acid. Ref: Voet Fundamentals of Biochemistry 4th Edition Pg no 82.
Aspaic acid
Histidine
Tyrosine
Serine
Structure and function of protein