IUPAC one letter codes for Amino Acids

IUPAC Amino acids codes

IUPAC Amino acids codes used in bioinformatics

Amino Acid	IUPAC code	Three letter code	Systematic Name
Alanine	A	Ala	2-Aminopropanoic acid
Cysteine	C	Cys	2-Amino-3-mercaptopropanoic acid
Aspartic Acid	D	Asp	2-Aminobutanedioic acid
Glutamic Acid	E	Glu	2-Aminopentanedioic acid
Phenylalanine	F	Phe	2-Amino-3-phenylpropanoic acid
Glycine	G	Gly	Aminoethanoic acid
Histidine	H	His	2-Amino-3-(1H-imidazol-4-yl)-propanoic acid
Isoleucine	I	Ile	2-Amino-3-methylpentanoic acid
Lysine	K	Lys	2,6-Diaminohexanoic acid
Leucine	L	Leu	2-Amino-4-methylpentanoic acid
Methionine	M	Met	2-Amino-4-(methylthio)butanoic acid
Asparagine	N	Asn	2-Amino-3-carbamoylpropanoic acid
Proline	P	Pro	Pyrrolidine-2-carboxylic acid
Glutamine	Q	Gln	2-Amino-4-carbamoylbutanoic acid
Arginine	R	Arg	2-Amino-5-guanidinopentanoic acid
Serine	S	Ser	2-Amino-3-hydroxypropanoic acid
Threonine	T	Thr	2-Amino-3-hydroxybutanoic acid
Valine	V	Val	2-Amino-3-methylbutanoic acid
Tryptophan	W	Trp	2-Amino-3-(1H-indol-3-yl)-propanoic acid
Tyrosine	Y	Tyr	2-Amino-3-(4-hydroxyphenyl)-propanoic acid

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