Table 5.

Number of β-turn structural elements and the distance between alpha carbons of i th and (i + 3)rd residues.^a

Residues	1b		3		4		5		6
	number of β-turns	distance (Å)	number of β-turns	distance (Å)	number of β-turns	distance (Å)	number of β-turns	distance (Å)	number of β-turns	distance (Å)
C1α-C4α	3	7.86 ± 1.21	1	8.57 ± 0.62	3	8.08 ± 1.13	9	6.91 ± 0.41	0
C2α-C5α	20c	4.95 ± 0.71	11d	6.99 ± 1.08	6	7.00 ± 1.05	0		20	4.98 ± 0.33
C3α-C6α	0		8	7.39 ± 1.24	0e		0		0
C4α-C7α	0		0		17	5.37 ± 0.74	20f	3.98 ± 0.23	0
C5α-C8α	0c		20d	5.79 ± 0.39	17	5.46 ± 0.60	0		5g	7.05 ± 0.16
C6α-Bzl	19	6.32 ± 0.43	11	6.96 ± 0.57	17e	5.50 ± 0.36	18	6.56 ± 0.56	20h	5.21 ± 1.02

^aOut of the best 20 calculated structures. The distance is the mean distance between two alpha carbons ± standard deviation (SD). The sequences with less than 7 Å distance between alpha carbons of i th and (i + 3) rd residues without helical structure were considered as a β-turn.⁵⁰ Bzl stands for the benzyl moiety at the C-terminus.

^bReference.²⁰