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. 2015 Jan 28;2015:281065. doi: 10.1155/2015/281065

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