| Residue | 3-letter | 1-letter | Monoisotopic mass | Average mass | Bull&Breese | mRNA codons (X means any) |
Average Occurence in Proteins (%)* |
pK1** | pK2** | pK Side Chain** |
|---|---|---|---|---|---|---|---|---|---|---|
| Alanine | Ala | A | 71.03712 | 71.08 | 610 | GCX | 9.0 | 2.35 | 9.87 | |
| Arginine | Arg | R | 156.10112 | 156.19 | 690 | CGX AGA AGG | 4.7 | 1.82 | 8.99 | 12.48 (guanidino) |
| Asparagine | Asn | N | 114.04293 | 114.10 | 890 | AAU AAC | 4.4 | 2.1 | 8.84 | |
| Aspartic acid | Asp | D | 115.02695 | 115.09 | 610 | GAU GAC | 5.5 | 1.99 | 9.90 | 3.90 (beta-COOH) |
| Cysteine | Cys | C | 103.00919 | 103.14 | 360 | UGU UGC | 2.8 | 1.92 | 10.78 | 8.33 (sulfhydryl) |
| Glutamic acid | Glu | E | 129.04260 | 129.12 | 510 | GAA GAG | 6.2 | 2.10 | 9.47 | 4.07 (gamma-COOH) |
| Glutamine | Gln | Q | 128.05858 | 128.13 | 970 | CAA CAG | 3.9 | 2.17 | 9.13 | |
| Glycine | Gly | G | 57.02147 | 57.05 | 810 | GGX | 7.5 | 2.35 | 9.78 | |
| Histidine | His | H | 137.05891 | 137.14 | 690 | CAU CAC | 2.1 | 1.80 | 9.33 | 6.04 (imidazole) |
| Isoleucine | Ile | I | 113.08407 | 113.16 | -1450 | AUU AUC AUA | 4.6 | 2.32 | 9.76 | |
| Leucine | Leu | L | 113.08407 | 113.16 | -1650 | UUA UUG CUX | 7.5 | 2.33 | 9.74 | |
| Lysine | Lys | K | 128.09497 | 128.17 | 460 | AAA AAG | 7.0 | 2.16 | 9.18 | 10.79 (epsilon-NH3+ |
| Methionine | Met | M | 131.04049 | 131.19 | -660 | AUG | 1.7 | 2.13 | 9.28 | |
| Phenylalanine | Phe | F | 147.06842 | 147.18 | -1520 | UUU UUC | 3.5 | 2.16 | 9.18 | |
| Proline | Pro | P | 97.05277 | 97.12 | -170 | CCX | 4.6 | 2.95 | 10.65 | |
| Serine | Ser | S | 87.03203 | 87.08 | 420 | UCX AGU AGC | 7.1 | 2.19 | 9.21 | |
| Threonine | Thr | T | 101.04768 | 101.10 | 290 | ACX | 6.0 | 2.09 | 9.10 | |
| Tryptophan | Trp | W | 186.07932 | 186.21 | -1200 | UGG | 1.1 | 2.43 | 9.44 | |
| Tyrosine | Tyr | Y | 163.06333 | 163.18 | -1430 | UAU UAC | 3.5 | 2.20 | 9.11 | 10.13 (phenol) |
| Valine | Val | V | 99.06842 | 99.13 | -750 | GUX | 6.9 | 2.29 | 9.74 |
* Klapper, M.H., Biochem. Biophys. Res. Commun. 78, 1020 (1997).
** Dawson, R.M.C., Elliot, D.C., Elliot, W.H., and Jones, K.M., Data for Biochemical Research (2nd ed.), pp. 1-63, Oxford University Press (1969)