Molecular viewing using JMol
Last updated: 14-02-2017.
GacH receptor of Streptomyces glaucescens GLA.O view
N-O hydrogen bonds options
Using Table 1 we can calculate mean and standard deviation for hydrogen bond lengths and N-O-C angles. According to the obtained data (mean: 3.0225Å and 150° for alpha helices, 2.858Å and 163.82° for beta strands; standard deviation: 0.15Å and 11.57° for alpha helices, 0.09Å and 3.03° for beta strands) it is not hard to notice, that average N-O-C angle is pretty much closer to 180° in beta strands than in alpha helices. Also, standard deviations show us that hydrogen bond lengths and N-O-C angles are more variable in alpha helices. I suggest, it may be connected with fact that amino acid radicals influence the structure less in beta sheets than in alpha helices because of steric reasons.
| # | Atom names | Bond length (Å) | N-O-C angle (°) |
|---|---|---|---|
| Alpha helices | |||
| 1 | N(339PHE)-O(335GLN) | 3.05 | 157.2 |
| 2 | N(343VAL)-O(339PHE) | 2.89 | 161.3 |
| 3 | N(340TRP)-O(336MET) | 2.89 | 151.8 |
| 4 | N(337SER)-O(334PRO) | 3.26 | 131.2 |
| Beta strands | |||
| 1 | N(007LEU)-O(034LYS) | 2.93 | 165.5 |
| 2 | N(036THR)-O(007LEU) | 2.75 | 162.6 |
| 3 | N(038GLU)-O(009ILE) | 2.78 | 168.2 |
| 4 | N(011ILE)-O(038GLU) | 3.00 | 163.7 |
| 5 | N(009ILE)-O(036THR) | 2.83 | 159.1 |
Table 1. Hydrogen bonds options betwixt backbone atoms in secondary structure.