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![[Figure 1]](qu5004fig1mag.jpg)
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Figure 1
The density-modification process (Zhang et al., 2001  ). (a) The process exemplified by the extension of a structure from the phases provided by a placed polyalanine helix in the structure of the C-terminal domain of Spr1875 at 1.6 Å resolution. For comparison, maps for the same protein in a different crystal, containing four zinc sites (PDB entry 6ysd), are shown. Data collected at a wavelength of 1.28224 Å to a resolution limit of 1.5 Å are used. (b) The map calculated with raw SAD phases shows noisy electron density everywhere. (c) The final density-modified map derived from that shown in (b). |
![[Figure 1]](qu5004fig1.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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