Table 2.

Torsions and bond angles [°] for the different puckers

	PLANAR	UP	DOWN
trans-PRO
counts	216	2160	1913
ω	180.5 ± 5.3	179.5 ± 3.6	180.5 ± 4.0
φ	−66.8 ± 11.1	−58.9 ± 7.3	−69.8 ± 9.3
χ1	4.6 ± 12.2	−24.9 ± 8.3	27.5 ± 7.5
χ2	−3.1 ± 10.2	36.7 ± 8.6	−36.3 ± 7.7
χ3	0.4 ± 6.0	−33.8 ± 7.3	30.6 ± 7.7
χ4	2.7 ± 7.0	18.6 ± 6.6	−13.6 ± 8.0
χ5	−4.6 ± 11.2	3.7 ± 7.2	−8.6 ± 7.8
Cα-Cβ-Cγ	106.7 ± 1.8	103.8 ± 1.7	103.7 ± 1.6
Cβ-Cγ-Cδ	108.9 ± 1.8	104.0 ± 2.4	104.4 ± 2.4
Cγ-Cδ-N	104.7 ± 1.5	102.6 ± 1.3	102.8 ± 1.2
Cδ-N-Cα	112.4 ± 1.5	111.3 ± 1.1	111.6 ± 1.1
N-Cα-Cβ	105.3 ± 1.7	103.7 ± 1.4	103.4 ± 1.3
cis-PRO
counts	19	29	188
ω	−3.35 ± 5.35	−1.80 ± 4.42	1.01 ± 5.80
Φ	−88.2 ± 16.1	−68.5 ± 10.2	−82.2 ± 10.3
χ1	25.5 ± 11.7	−18.0 ± 11.2	33.9 ± 5.7
χ2	−18.1 ± 9.2	32.6 ± 11.6	−38.4 ± 6.2
χ3	3.8 ± 4.8	−34.0 ± 8.9	27.6 ± 7.5
χ4	13.3 ± 7.2	23.5 ± 6.3	−6.1 ± 8.3
χ5	−24.5 ± 11.4	−3.7 ± 8.4	−17.3 ± 7.3
Cα-Cβ-Cγ	104.7 ± 2.2	104.7 ± 1.6	102.8 ± 1.7
Cβ-Cγ-Cδ	107.6 ± 1.7	104.3 ± 2.4	104.3 ± 2.0
Cγ-Cδ-N	104.9 ± 3.1	102.2 ± 1.8	103.1 ± 1.3
Cδ-N-Cα	110.5 ± 2.7	111.2 ± 1.2	111.4 ± 1.5
N-Cα-Cβ	104.0 ± 3.1	103.7 ± 0.9	102.7 ± 1.5