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Figure 4
(a) Scatter plot (in stereo) of the distribution of carbonyl O atoms around the disulfide plane in elastase; the atoms interacting with all four disulfide bonds from the first data set (A-0) are shown. The Cβ—Sγ—Sγ′ plane (where Sγ is the atom in contact with O) is the common frame around which the coordinates of the O atoms are expressed; these are labeled with the numbers of the residues that they belong to (given in Table 2[link]). (b) Polar graph of θ versus φ values taken from Tables 2[link], 4[link] and 5[link]: those for the susceptible disulfide bonds are in blue (if there are multiple contacts, the first entry is used), and the less susceptible disulfide bonds are in red (that with the shortest contact distance is used if there are multiple entries).

IUCrJ
Volume 7| Part 5| September 2020| Pages 825-834
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520008520