Table 2.
Populations (in %) of the types I and III β-turns identified in certain tetrapeptide units of the HM A molecules. Xaa1 = Aib/D-Iva, Xaa3 = Val/Ile, Xaa4 = Val/Leu/Ile, and Xaa8 = Leu/Ile.
| Types I and III β-turns | ||||||
|---|---|---|---|---|---|---|
| Tetrapeptide units | HM A-1 | HM A-2 | HM A-3 | HM A-4 | HM A-5 | HM A-5a |
| Xaa1–Gln2–Xaa3–Xaa4 | 9.6 | 8.9 | 8.6 | 8.6 | 8.3 | 11.5 |
| Gln2–Xaa3–Xaa4–Aib5 | 17.1 | 5.2 | 17.7 | 15.7 | 16.2 | 15.1 |
| Xaa4–Aib5–Pro6–Leu7 | 6.1 | 9.6 | 6.3 | 4.4 | 5.7 | 5.8 |
| Aib5–Pro6–Leu7–Xaa8 | 7.1 | 11.3 | 9.6 | 7.2 | 7.9 | 8.7 |
| Pro6–Leu7–Xaa8–Aib9 | 14.5 | 7.4 | 17.1 | 13.4 | 11.6 | 12.4 |
| Xaa8–Aib9–Pro10–Leuol11 | 8.6 | 12.9 | 8.2 | 8.9 | 7.6 | 9.1 |