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Figure 1
View of ebselen attached to Cys141 (PDB entry 6zk0). (a) Overview of two ebselen molecules attached to the A and A′ (symmetry-related) subunits around the crystallographic twofold axis. One subunit (A) has C atoms in orange and the second subunit (A′) has C atoms in slate blue (N atoms are blue, O atoms are red, Se atoms are orange and S atoms are yellow-orange). C atoms in one ebselen are yellow and those in the second ebselen are cyan. Hydrogen bonds near ebselen are indicated by dotted lines. (b) Chemical structures of ebselen and ring-opened ebselen on Cys141 (drawn with Marvin; https://www.chemaxon.com). (c) Final ebselen OMIT map (FoFc; 3σ, green; 15σ, blue). Note that the peaks on the seleniums (blue mesh) are 20.5σ and 19.6σ in this ebselen OMIT map. (d) Original DIMPLE (Wojdyr et al., 2013BB40) 2FoFc map (1σ, light blue) and FoFc difference map (3σ, orange). For subunit A the DIMPLE-refined structure with waters (small red spheres) refined into the density for the ebselen is shown. For the A′ subunit the `final' coordinates (including ebselen) are shown.

Journal logoSTRUCTURAL BIOLOGY
COMMUNICATIONS
ISSN: 2053-230X
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