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. 2016 Nov 8;2(12):896–903. doi: 10.1021/acscentsci.6b00232

Figure 4.

Figure 4

Complexes of (a) wild-type SsGH134 with M3 and (b) E45Q variant with M5 showing the proposed general acid (E45/Q45) suitably positioned near the fissile glycosidic bond, and on the opposing side the proposed general base D57, coordinating the nucleophilic water molecule. Electron density meshes are σA-weighted 2F0 – Fc contoured at 1σ (0.58 and 0.47 electrons per Å3, respectively), assembled using CCP4mg.33 (c) Cartoon showing major protein substrate interactions for the SsGH134–mannopentaose complex. Interactions are shown for the model of the SsGH134 bound to the α-anomer of β-1,4-mannopentaose. The red spheres denote water molecules.