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. 2015 Feb 14;22(Pt 2):201–212. doi: 10.1107/S1600577515002131

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© Markus Gerstel et al. 2015

This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.

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Classification of CYS–CYS disulfide bonds according to dihedral bond angles. (a) A disulfide bond can be described by five dihedral angles, which can be defined from either side. (b) The three basic groups, spiral, hook, and staple, are determined by the three central angles χ₂, χ₃, and are named after the motifs they resemble. The sign of the central χ₃ angle can be used to determine the bond as left-handed (LH) or right-handed (RH), and combined with the signs of the remaining two dihedral bond angles χ₁ and (−, +/−, +) results in a total of 20 different disulfide bond types. Reprinted by permission from Macmillan Publishers Ltd: Nature Reviews Cancer (Hogg, 2013 ▶), Copyright (2013).

Inline graphic — Classification of CYS–CYS disulfide bonds according to dihedral bond angles. (a) A disulfide bond can be described by five dihedral angles, which can be defined from either side. (b) The three basic groups, spiral, hook, and staple, are determined by the three central angles χ₂, χ₃, and are named after the motifs they resemble. The sign of the central χ₃ angle can be used to determine the bond as left-handed (LH) or right-handed (RH), and combined with the signs of the remaining two dihedral bond angles χ₁ and (−, +/−, +) results in a total of 20 different disulfide bond types. Reprinted by permission from Macmillan Publishers Ltd: Nature Reviews Cancer (Hogg, 2013 ▶), Copyright (2013).