Structure and Property of the Naturally-Occurring Amino Acids

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Amino Acid	3 Letter Code	1 Letter Code	Structure	pK_a1 (α-carboxyl)	pk_a2 (α-amino)	pk_a3 (side chain)
Nonpolar Side Chains
Glycine	Gly	G		2.35	9.78	.
Alanine	Ala	A		2.35	9.87	.
Valine	Val	V		2.29	9.74	.
Leucine	Leu	L		2.33	9.74	.
Isoleucine	Ile	I		2.32	9.76	.
Methionine	Met	M		2.13	9.28	.
Proline	Pro	P		1.95	10.64	.
Phenylalanine	Phe	F		2.20	9.31	.
Tryptophan	Trp	W		2.46	9.41	.
Uncharged Polar Side Chains
Serine	Ser	S		2.19	9.21	.
Threonine	Thr	T		2.09	9.10	.
Asparagine	Asn	N		2.14	8.72	.
Glutamine	Gln	Q		2.17	9.13	.
Tyrosine	Tyr	Y		2.20	9.21	10.46
Cysteine	Cys	C		1.92	10.70	8.37
Charged Polar Side Chains10.54
Lysine	Lys	K		2.16	9.06	10.54
Arginine	Arg	R		1.82	8.99	12.48
Histidine	His	H		1.80	9.33	6.04
Aspartic Acid	Asp	D		1.99	9.90	3.90
Glutamic Acid	Glu	E		2.10	9.47	4.07

Contributors and Attributions

Prof. Henry Jakubowski (College of St. Benedict/St. John's University)