Translations:Amino acid/43/en
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| Amino acid | 3- and 1-letter symbols | Side chain | Hydropathy index |
Molar absorptivity | Molecular mass | Abundance in proteins (%) |
Standard genetic coding, IUPAC notation | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 1 | Class | Chemical polarity | Net charge at pH 7.4 |
Wavelength, λmax (nm) |
Coefficient ε (mM−1·cm−1) | |||||
| Alanine | Ala | A | Aliphatic | Nonpolar | Neutral | 1.8 | 89.094 | 8.76 | GCN | ||
| Arginine | Arg | R | Fixed cation | Basic polar | Positive | −4.5 | 174.203 | 5.78 | MGR, CGY | ||
| Asparagine | Asn | N | Amide | Polar | Neutral | −3.5 | 132.119 | 3.93 | AAY | ||
| Aspartate | Asp | D | Anion | Brønsted base | Negative | −3.5 | 133.104 | 5.49 | GAY | ||
| Cysteine | Cys | C | Thiol | Brønsted acid | Neutral | 2.5 | 250 | 0.3 | 121.154 | 1.38 | UGY |
| Glutamine | Gln | Q | Amide | Polar | Neutral | −3.5 | 146.146 | 3.9 | CAR | ||
| Glutamate | Glu | E | Anion | Brønsted base | Negative | −3.5 | 147.131 | 6.32 | GAR | ||
| Glycine | Gly | G | Aliphatic | Nonpolar | Neutral | −0.4 | 75.067 | 7.03 | GGN | ||
| Histidine | His | H | Cationic | Brønsted acid and base | Positive, 10% Neutral, 90% |
−3.2 | 211 | 5.9 | 155.156 | 2.26 | CAY |
| Isoleucine | Ile | I | Aliphatic | Nonpolar | Neutral | 4.5 | 131.175 | 5.49 | AUH | ||
| Leucine | Leu | L | Aliphatic | Nonpolar | Neutral | 3.8 | 131.175 | 9.68 | YUR, CUY | ||
| Lysine | Lys | K | Cation | Brønsted acid | Positive | −3.9 | 146.189 | 5.19 | AAR | ||
| Methionine | Met | M | Thioether | Nonpolar | Neutral | 1.9 | 149.208 | 2.32 | AUG | ||
| Phenylalanine | Phe | F | Aromatic | Nonpolar | Neutral | 2.8 | 257, 206, 188 | 0.2, 9.3, 60.0 | 165.192 | 3.87 | UUY |
| Proline | Pro | P | Cyclic | Nonpolar | Neutral | −1.6 | 115.132 | 5.02 | CCN | ||
| Serine | Ser | S | Hydroxylic | Polar | Neutral | −0.8 | 105.093 | 7.14 | UCN, AGY | ||
| Threonine | Thr | T | Hydroxylic | Polar | Neutral | −0.7 | 119.119 | 5.53 | ACN | ||
| Tryptophan | Trp | W | Aromatic | Nonpolar | Neutral | −0.9 | 280, 219 | 5.6, 47.0 | 204.228 | 1.25 | UGG |
| Tyrosine | Tyr | Y | Aromatic | Brønsted acid | Neutral | −1.3 | 274, 222, 193 | 1.4, 8.0, 48.0 | 181.191 | 2.91 | UAY |
| Valine | Val | V | Aliphatic | Nonpolar | Neutral | 4.2 | 117.148 | 6.73 | GUN | ||