Peptide Tools

Sl. No.	Amino acid	One letter code	Three letter code
1	Glycine	G	Gly
2	Alanine	A	Ala
3	Leucine	L	Leu
4	Methionine	M	Met
5	Phenylalanine	F	Phe
6	Tryptophan	W	Trp
7	Lysine	K	Lys
8	Glutamic acid	E	Glu
9	Glutamine	Q	Gln
10	Serine	S	Ser
11	proline	P	Pro
12	Valine	V	Val
13	Isoleucine	I	Ile
14	Cysteine	C	Cys
15	Tyrosine	Y	Tyr
16	Histidine	H	His
17	Arginine	R	Arg
18	Aspargine	N	Asn
19	Aspartic acid	D	Asp
20	Threonine	T	Thr

Amino Acid	Pka value	Pka value	Pka value
	Name	Alpha Carboxy	+Alpha Amino	Side Chain
Non-polar Amino Acid	Glycine	2.34	9.60
	Alanine	2.34	9.69
	Valine	2.32	9.62
	Leucine	2.36	9.60
	Isoleucine	2.36	9.68
	Methionine	2.28	9.21
	Phenylalanine	1.83	9.13
	Tryptophan	2.38	9.39
	Proline	1.99	10.60
Polar Amino Acids	Serine	2.21	9.15
	Threonine	2.63	9.10
	Cysteine	1.71	10.78	8.33
	Tyrosine	2.2	9.11	10.07
	Asparagine	2.02	8.84
	Glutamine	2.17	9.13
Acidic Amino Acids	Aspartic Acid	2.09	9.82	3.86
Acidic Amino Acids	Glutamic Acid	2.19	9.67	4.25
Basic Amino Acids	Lysine	2.18	8.95	10.79
	Arginine	2.17	9.04	12.48
	Histidine	1.82	9.17	6.04

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