Table 1 Rules for assignment of structural classes based on the content of the corresponding secondary structures.
reference | structural class | α-helix amount | β-strand amount | additional constrains |
|---|---|---|---|---|
[13] | all-α | ≥ 40% | ≤ 5% |  |
|  | all-β | ≤ 5% | ≥ 40% |  |
|  | α+β | ≥ 15% | ≥ 15% | more than 60% antiparallel β-sheets |
|  | α/β | ≥ 15% | ≥ 15% | more than 60% parallel β-sheets |
[14] | all-α | > 15% | < 10% |  |
|  | all-β | < 15% | > 10% |  |
| Â | mixed | > 15% | > 10% | Â |