Amino Acids
Amino acids with nonpolar side chains
| Name & Symbols | Structural Formula | Residue Mass (D) | Average Occurance (%) | pK1 ∝-COOH |
pK2 ∝-NH+3 |
Molecule |
|---|---|---|---|---|---|---|
| Glycine Gly G |
57.0 | 6.8 | 2.35 | 9.78 | ||
| Alanine Ala A |
71.1 | 7.6 | 2.35 | 9.87 | ||
| Valine Val V |
99.1 | 6.6 | 2.29 | 9.74 | ||
| Leucine Leu L |
113.2 | 9.5 | 2.33 | 9.74 | ||
| Isoleucine Ile I |
113.2 | 5.8 | 2.32 | 9.76 | ||
| Methoionine Met M |
131.2 | 2.4 | 2.13 | 9.28 | ||
| Proline Pro P |
97.1 | 5.0 | 1.95 | 10.64 | ||
| Phenylalanine Phe F |
147.2 | 4.1 | 2.20 | 9.31 | ||
| Tryptophan Trp W |
186.2 | 1.2 | 2.46 | 9.41 |
Amino acids with uncharged polar side chains
| Name & Symbols | Structural Formula | Residue Mass (D) | Average Occurance (%) | pK1 ∝-COOH |
pK2 ∝-NH+3 |
pKR Side Chain |
Molecule |
|---|---|---|---|---|---|---|---|
| Serine Ser S |
87.1 | 7.1 | 2.19 | 9.21 | |||
| Threonine Thr T |
101.1 | 5.6 | 2.09 | 9.10 | |||
| Asparagine Asn N |
114.1 | 4.3 | 2.14 | 8.72 | |||
| Glutamine Gln Q |
128.1 | 3.9 | 2.17 | 9.13 | |||
| Tyrosine Tyr Y |
163.2 | 3.2 | 2.20 | 9.21 | 10.46 (phenol) | ||
| Cycteine Cys C |
103.1 | 1.6 | 1.92 | 10.72 | 8.37 (sulfhydryl) |
Amino acids with charged polar side chains
| Name & Symbols | Structural Formula | Residue Mass (D) | Average Occurance (%) | pK1 ∝-COOH |
pK2 ∝-NH+3 |
pKR Side Chain |
Molecule |
|---|---|---|---|---|---|---|---|
| Lysine Lys K |
128.2 | 6.0 | 2.16 | 9.06 | 10.54 (ε-NH+3 | ||
| Arginine Arg R |
156.2 | 5.2 | 1.82 | 8.99 | 12.48 (guanidino) | ||
| Histidine His H |
137.1 | 2.2 | 1.80 | 9.33 | 6.04 (imidazole) | ||
| Aspartic Acid Asp D |
115.1 | 5.2 | 1.99 | 9.90 | 3.90 (β-COOH) | ||
| Glutamic Acid Glu E |
129.1 | 6.5 | 2.10 | 9.47 | 4.07 (γ-COOH) |
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