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The charged amino acids:
Aspartate and Glutamate are negatively charged.
Lysine and Arginine are positively charged.
Amino Acids: Charged
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Aspartate (aka aspartic acid)
Under physiological conditions, aspartate is negatively charged.
Aspartate is one of the major components of the artificial sweetener aspartame, which is found in many diet sodas.
Glutamate (aka glutamic acid
Glutamate’s structure is very similar to aspartate, it just has an extra CH2 before the carboxylic acid group.
Glutamate’s sodium salt, monosodium glutamate, or MSG is used in the food industry to enhance the flavor of savory foods.
Lysine
Letter K was closest letter to L that was available.
Arginine
To remember its letter, remember that the word Arginine starts with an “R” sound.
Related Tutorials
Amino Acid Structures: Part I
Amino Acid Structures: Part II