McMurry Table 26-1: The 20 Common Amino Acids in Proteins
|
| Amino Acid |
pKa of α-COOH |
pKa of α-NH3+ |
pKa of Side Chain |
Isoelectric Point (pI) |
| Alanine |
2.34 |
9.69 |
- |
6.01 |
| Asparagine |
2.02 |
8.80 |
- |
5.41 |
| Cysteine |
1.96 |
10.28 |
8.18 |
5.07 |
| Glutamine |
2.17 |
9.13 |
- |
5.65 |
| Glycine |
2.34 |
9.60 |
- |
5.97 |
| Isoleucine |
2.36 |
9.60 |
- |
6.02 |
| Leucine |
2.36 |
9.60 |
- |
5.98 |
| Methionine |
2.28 |
9.21 |
- |
5.74 |
| Phenylalanine |
1.83 |
9.13 |
- |
5.48 |
| Proline |
1.99 |
10.60 |
- |
6.30 |
| Serine |
2.21 |
9.15 |
- |
5.68 |
| Threonine |
2.09 |
9.10 |
- |
5.60 |
| Tryptophan |
2.83 |
9.39 |
- |
5.89 |
| Tyrosine |
2.20 |
9.11 |
10.07 |
5.66 |
| Valine |
2.32 |
9.62 |
- |
5.96 |
| Aspartic acid |
1.88 |
9.60 |
3.65 |
2.77 |
| Glutamic acid |
2.19 |
9.67 |
4.25 |
3.22 |
| Arginine |
2.17 |
9.04 |
12.48 |
10.76 |
| Histidine |
1.82 |
9.17 |
6.00 |
7.59 |
| Lysine |
2.18 |
8.95 |
10.53 |
9.74 |