Structure of R. rhodochrous J1 nitrilase Figure 1. Negatively stained low-dose electron micrographs of C-terminal truncated variants Rhodococcus rhodochrous J1 nitrilase Figure 2. Negatively stained low-dose electron micrographs of the C-terminal truncated nitrilase variant (J1Cδ327) from Rhodococcus rhodochrous J1 Figure 3. 3D reconstructions of the C-terminal truncated nitrilase from Rhodococcus Rhodochrous J1. Helical twist parameters are (L®R): J1CD327 (73.3°, 15.8 Å), J1CD327_E138L (77.0°, 15.8 Å), J1CD311 and J1CD302 (-66.0°, 13.3 Å). Figure 4. Fitting of homology models into the three-dimensional electron microscopic reconstructions of the carboxy-terminal truncated J1CD327 (left) and J1CD311 (right) variants of Rhodococcus rhodochrous J1 nitrilase.