Dissection of Factors Affecting the Variability of the Peptide Bond Geometry and Planarity

Table 4

Average values of bond angles with standard deviations and occurrences (in bracket) of non-Gly/non-Pro residues in β-structure in the 15°  × 15° boxes centered at = (−120°, 130°) and = (−60°, 150°). The differences between the average values of the distributions and the statistical significance of these differences ( value) are reported.

Bond angle			Difference	value
	= (−120°, 130°); (14076)	= (−60°, 150°); (680)
NC^αC	108.8 ± 1.9	110.3 ± 1.8	1.5
C^αCO	120.4 ± 0.9	121.1 ± 0.9	0.7
C^αCN^+1	116.4 ± 1.1	115.9 ± 1.1	−0.5
OCN^+1	123.2 ± 0.9	122.9 ± 1.0	−0.3
C^−1NC^α	122.5 ± 1.3	120.6 ± 1.4	−1.9
NC^αC^β	110.9 ± 1.4	110.4 ± 1.4	−0.5
C^βC^αC	109.7 ± 1.5	109.5 ± 1.7	−0.2	0.0025