Structure and Property of the Naturally-Occurring Amino Acids
- Page ID
- 4687
| Amino Acid | 3 Letter Code | 1 Letter Code | Structure | pKa1 (α-carboxyl) | pka2 (α-amino) | pka3 (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 |