List of Amino Acids and Their Abbreviations

(Click on the magnifying glass to see the amino acid structure)

Yellow amino acids contain sulfur.
Blue amino acids can be phosphorylated.

Nonpolar Amino Acids (hydrophobic)

amino acid	three letter code	single letter code
glycine	Gly	G
alanine	Ala	A
valine	Val	V
leucine	Leu	L
isoleucine	Ile	I
methionine	Met	M
phenylalanine	Phe	F
tryptophan	Trp	W
proline	Pro	P

Polar (hydrophilic)

serine	Ser	S
threonine	Thr	T
cysteine	Cys	C
tyrosine	Tyr	Y
asparagine	Asn	N
glutamine	Gln	Q

Electrically Charged (negative)

aspartic acid	Asp	D
glutamic acid	Glu	E

Electrically Charged (positive)

lysine	Lys	K
arginine	Arg	R
histidine	His	H

Molecular Structure of the 20 Amino Acid Side Chains

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