Structural statistics of 5584 AMPs in the APD:
| Structural Class | Peptide Number | Percentage |
|---|---|---|
| Helix: | 917 | 16.42% |
| Beta structure: | 118 | 2.11% |
| Helix and beta unpacked: | 4 | 0.07% |
| Combine helix and beta packed: | 122 | 2.18% |
| Neither helix nor beta structure: | 43 | 0.77% |
| Rich in unusual aa: | 438 | 7.84% |
| Disulfide bridge (but no 3D): | 665 | 11.91% |
| Unknown 3D structure: | 3277 | 58.69% |
There are 534 peptides with known 3D structure in this database.
| The number of structures determined are: | |
| By NMR: | 470 |
| By X-Ray Diffraction: | 64 |