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Figure 4
Analysis of MBS in cryo-EM structures. This figure illustrates the model with superimposed density maps for a specific metal-binding site. (a) Structure 7k00 (MBS ID: a:6163), showcasing a gray Mg2+ ion surrounded by coordinating water molecules, with modeled octahedral geometry and distances (2.25 Å) suggesting Mg2+ ion coordination. (b) Structure 8b0x (MBS ID: a:3203), depicting a purple K+ ion coordinated by both water molecules and rRNA residues within the first coordination sphere. The structural differences between the two representations indicate distinct metal ion coordination environments, with the K+ ion in 8b0x exhibiting a larger coordination distance (2.90 Å) compared with the Mg2+ ion in 7k00.

IUCrJ
Volume 11| Part 5| September 2024| Pages 871-877
ISSN: 2052-2525
https://doi.org/10.1107/S2052252524007073