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Geometries of the disulfide bridges. Shown is a superposition based on the cysteine backbone and the Cβ atoms of the N-terminal domain. Green, chain A of 5′NT–C; blue, chain A of 5′NT–O1; red, 5′NT–O2. Carbon atoms are depicted in gray; nitrogen atoms, in blue; and sulfur atoms, in yellow. For 5′NT–O2 the denotations of atoms and dihedral angles are shown (cf. Table 1). The descriptors for the C-terminal cysteine are labeled by a prime.
