Table I.
Average N-N and H-N distances in typical elements of secondary structure in proteins. The values were extracted based on 100 randomly chosen protein structures in the program STARS.82.
| Type of contact | N1-N2 (Å) | N1-H2 (Å) | N2-H1 (Å) |
|---|---|---|---|
| Sequential Ni-Ni+1 in β-sheet | 3.5±0.2 | 3.9±0.3 | 3.7±0.7 |
| Sequential - Ni-Ni+1 in α-helix | 2.8±0.1 | 3.3±0.1 | 2.5±0.1 |
| Sequential - Ni-Ni+2 in α-helix | 4.3±0.1 | 3.6±0.2 | 5.0±0.1 |
| Sequential - Ni-Ni+3 in α-helix | 4.8±0.2 | 6.8±2.4 | 7.6±1.8 |
| β-bridge partners in antiparallel β-sheet | 4.5±0.4 | 3.8±0.7 | 3.8±0.7 |
| β -bridge partners in parallel β-sheet | 4.8±0.2 | 4.0±0.4 | 5.7±0.5 |