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. 2020 Jun 10;3:298. doi: 10.1038/s42003-020-1030-1

Fig. 4. Structural transition from compact to extended spirosome makes a substrate channel accessible by solvent.

Fig. 4

Substrate channels in the extended (a) and compact (b) AdhE spirosomes. The substrate channel between NAD+s of ALDH and ADH catalytic sites from two different AdhE subunits (colored in gray and pale-purple) is shown in a cyan surface representation. NAD+ in the compact spirosome (b) was modeled based on the obtained cryo-EM structure. c Molecular docking simulation of acetaldehydes shows that top 100 poses of acetaldehyde (shown in a stick model) form a continuous pathway along the substrate channel (Supplementary Movie 3).