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Figure 2
The substrate-binding clefts of the OfChtI-CAD (a) and SmChiB (b) complexes. The carbohydrate-binding module and the linker of SmChiB are not shown. The (GlcNAc)2/3 bound to OfChtI-CAD and the (GlcNAc)5 bound to SmChiB (PDB entry 1e6n; van Aalten et al., 2001BB1) are shown as sticks with yellow C atoms. The numbers indicate the subsites to which the sugar is bound. The aromatic residues in the substrate-binding clefts of OfChtI-CAD and SmChiB are labelled and are shown as blue sticks. In OfChtI-CAD, the four residues forming the hydrophobic plane are shown in cyan. In SmChiB, loop 311–322 forming the roof of the tunnel and residues 14–29 forming the blunted nonreducing end are labelled and shown in orange.

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