AA R groups

Glycine (Gly)

H

Alanine (Ala)

CH3

Valine (Val)

CH, CH3, CH3

Leucine (Leu)

CH2, CH, CH3, CH3

Isoleucine (Ile)

CH, CH3, CH2, CH3

Serine (Ser)

CH2, OH

Threonine (Thr)

CH, CH3, OH

Cysteine (Cys)

CH2, SH

Methionine (Met)

CH2, CH2, S, CH3

Aspartate/Aspartic Acid (Asp)

CH2, COO-

Glutamate/Glutamic Acid (Glu)

CH2, CH2, COO-

Asparagine (Asn)

CH2, C—O, NH2

Glutamine (Gln)

CH2, CH2, C—O, NH2

Lysine (Lys)

CH2, CH2, CH2,CH2, NH3+

Arginine (Arg)

CH2, CH2, CH2, NH, C—NH2+, NH2

Phenylalanine (Phe)

CH2, benzene

Tyrosine (Tyr)

CH2, benzene, OH

Proline (Pro)

CH, CH2, CH2, NH2+

Histidine (His)

CH2, CH, N, CH, NH, CH (5 membered ring)

Tryptophan (Trp)

CH2, two six-membered rings (one w/ NH)