Table 1.
Mean and root-mean-square deviations of triple helical step parameters extracted from 40 well-resolved collagen X-ray crystal structures.
| Step | Step | Shift | Slide | Rise | Tilt | Roll | Twist |
|---|---|---|---|---|---|---|---|
| number | (Å) | (Å) | (Å) | (°) | (°) | (°) | |
| GP2-GP2 * | 642 | −4.24 ± 0.18 | 0.84 ± 0.17 | 3.25 ± 0.07 | −11.14 ± 1.51 | 9.46 ± 1.94 | −101.72 ± 2.84 |
| GP2-GP1 | 31 | −4.32 ± 0.14 | 0.85 ± 0.22 | 3.22 ± 0.06 | −10.28 ± 1.53 | 8.52 ± 2.5 | −103.91 ± 3.02 |
| GP1-GP2 | 29 | −4.35 ± 0.14 | 0.79 ± 0.21 | 3.23 ± 0.08 | −10.38 ± 1.41 | 8.39 ± 1.47 | −103.47 ± 2.79 |
| GP1-GP1 | 77 | −4.41 ± 0.21 | 0.78 ± 0.18 | 3.20 ± 0.10 | −9.59 ± 1.61 | 7.56 ± 2.02 | −104.38 ± 2.83 |
| GP1-GP0 | 22 | −4.45 ± 0.24 | 0.75 ± 0.14 | 3.20 ± 0.09 | −9.07 ± 2.04 | 6.69 ± 2.24 | −105.19 ± 4.27 |
| GP0-GP1 | 21 | −4.48 ± 0.22 | 0.65 ± 0.22 | 3.21 ± 0.09 | −9.25 ± 2.66 | 6.67 ± 2.20 | −104.99 ± 3.74 |
| GP0-GP0 | 42 | −4.56 ± 0.24 | 0.75 ± 0.21 | 3.14 ± 0.15 | −7.89 ± 2.63 | 5.97 ± 2.25 | −107.48 ± 3.74 |
*Subscripts are the numbers of imino (Pro/Hyp) residues in a Gly/X/Y triad.
The steps are divided into 7 groups according to the number of Pro or Hyp residues. GP2-GP0 and GP0-GP2 steps were not observed due to the preponderance of homotrimers in the database.