Amino acid properties

Amino acid 3-letter code 1-letter code pKa Cα-COOH pKa Cα-NH3+ pKa side chain Isoelectric point (pI)
Alanine (alanina) Ala A  2.34  9.69  - 6.02
Arginine (arginina) Arg R  2.17  9.04  12.48 10.76
Asparagine (asparagina) Asn N  2.02  8.80  - 5.41
Cysteine (cysteina) Cys C  1.71  10.78  8.33 5.02
Phenylalanine (fenyloalanina) Phe F  1.83  9.13  - 5.48
Glycine (glicyna) Gly G  2.34  9.60  - 5.97
Glutamine (glutamina) Gln Q  2.17  9.13  - 5.65
Histidine (histydyna) His H  1.82  9.17  6.00 7.59
Isoleucine (izoleucya) Ile I  2.36  9.60  - 5.98
Aspartic acid (kwas asparaginowy) Asp D  2.09  9.82  3.86 2.98
Glutamic acid (kwas glutaminowy) Glu E  2.19  9.67  4.25 3.22
Leucine (leucyna) Leu L  2.36  9.60  - 5.98
Lysine (lizyna) Lys K  2.18  8.95  10.79 9.74
Methionine (metionina) Met M  2.28  9.21  - 5.75
Proline (prolina) Pro P  1.99  10.60  - 6.30
Serine (seryna) Ser S  2.21  9.15  - 5.58
Threonine (treonina) Thr T  2.09  9.10  - 5.60
Tryptophan (tryptofan) Trp W  2.43  9.44  - 5.94
Tyrosine (tyrozyna) Tyr Y  2.20  9.11  10.07 5.66
Valine (walina) Val V  2.32  9.62 - 5.97

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pKa and pI values of amino acids