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![[Figure 1]](rr5213fig1mag.jpg)
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Figure 1
A view of the patched torsion section in a CIF restraint dictionary entry. This is an extract of the new CCP4 restraint dictionary entry for N-acetyl-β-D-glucosamine (GlcNAc), which is represented in the PDB as `NAG'. The new dictionaries distinguish ring torsion angles (prepended by `ring_') from the rest (`tors_') so they can be activated separately to keep a low-energy ring pucker. Older CCP4 dictionaries had no separation between the ring torsions (unimodal) and the rest of the torsions (periodicity 2, 3 or 6), and had a uniform uncertainty of 20.0°. |
![[Figure 1]](rr5213fig1.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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