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Figure 6
Residual density (left and right) and deformation density (centre) around the backbone NH group of Arg17 in crambin. The residual density is contoured from −0.3 e Å−3 (red) to 0.28 e Å−3 (green) in linear 0.02 e Å−3 steps. The deformation density describes the differences of the modelled density to the IAM, showing isovalues from −0.3 e Å−3 (red) to 0.28 e Å−3 (blue) in linear 0.02 e Å−3 steps. The CA, N, H, C and O atoms of Arg17 are within the plane, whereas the O atom of Phe13, receiving the hydrogen bond, is outside the plane.

IUCrJ
Volume 13| Part 1| January 2026| Pages 53-62
ISSN: 2052-2525
https://doi.org/10.1107/S2052252525010188