Hydrogen bonds of backbone atoms. Length and N-H-O angle.
α-helix
#
Bond length, Å
N-H-O angle, °
N(127ARG)-O(123VAL)
2.86
164.0
N(128ALA)-O(124ASP)
2.91
160.4
N(129ALA)-O(125VAL)
3.05
142.5
N(126LEU)-O(122GLY)
3.02
159.4
N(131VAL)-O(126LEU)
2.98
164.6
N(94ALA)-O(90LYS)
3.03
160.7
N(95ALA)-O(91LYS)
2.82
150.9
Average
2.95
157.5
ß-layer
#
Bond length, Å
N-H-O angle, °
N(60GLN)-O(67TYR)
2.97
149.0
N(69SER)-O(58ALA)
3.08
158.8
N(71GLY)-O(56HIS)
2.89
151.7
N(81LEU)-O(74VAL)
2.89
175.0
N(75ARG)-O(52GLY)
2.81
164.4
N(83ILE)-O(72LEU)
2.77
179.0
N(56HIS)-O(71GLY)
3.00
154.8
Average
2.92
161.8
Total Average
2.94
159.7
Hydrogen bonds average parameters according to researches[1].
Parameter
Observed
Expected
Length, Å
2.92
< 3.5
N-H-O angle, °
161.8
160
Average parameters of hydrogen bonds are typical and are within acceptable values for proteins.
[1]Roderick E Hubbard Muhammad Kamran Haider: "Hydrogen Bonds in Proteins: Role and Strength", 2010. https://doi.org/10.1002/9780470015902.a0003011.pub2