Figure 6
(a) OMIT difference 2Fo − Fc electron density of Tris-xylobiose and xylotriose in native XynII–TrisX2–X3 contoured at the 1.0σ level. (b) Chemical diagram of conventional direct hydrogen-bond interactions between TrisX2, X3 and the residues of the enzyme. (c) Water-mediated interactions between ligands and the active-site residues in XynII–TrisX2–X3. |