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![[Figure 4]](kw5124fig4mag.jpg)
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Figure 4
X-Pro problems characterized by positive φi angles. (a) X-Pro tc− flip; Ser339-Pro340, chain A, PDB entry 1se6 (Zhao et al., 2005  ), 1.75 Å resolution. (b) Pro-Gly tt+ flip; Val53-Pro54-Gly55, chain A, PDB entry 1hxd (Weaver et al., 2001), 2.40 Å resolution. (c) X-Pro tt+ flip; Leu203-Pro204, chain B, PDB entry 1cdd (Almassy et al., 1992), 2.80 Å resolution. Electron-density maps were calculated using the PDB structure and are rendered as in Fig. 1. The PDB structures are shown in pink and the PDB_REDO structures in green; the manually corrected and re-refined structure is shown in orange. |
![[Figure 4]](kw5124fig4.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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