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Figure 4
Electron density for SERCA ligands at different resolutions. Upper panels depict the nucleotide-binding site (region 1 in Fig. 1[link]b) and lower panels the Ca2+-binding site (region 2 in Fig. 1[link]b). Green mesh, mFo − DFc map after refinement without any ligands contoured at 3.0σ. Refinements with resolution cutoffs lower than 3.4 Å were restricted to 13 rigid-body groups, whereas refinements including data to 3.4 Å resolution or higher included individual atom coordinates and B factors. The expected ligand positions are superposed on all panels for Ca2+ and on the last panel for Ca2+–AMPPCP (PDB entry 3n8g ). For a quantification of the density coverage around the ligands, see Supplementary Figs. S3 and S4.

IUCrJ
Volume 2| Part 4| June 2015| Pages 409-420
ISSN: 2052-2525
doi:10.1107/S2052252515008969