Figure 6. The role of calcium in xylan recognition by the family 36 CBM, PpCBM36, from Pa. polymyxa xylanase 43.
The calcium atom bound in the binding site of PpCBM36 is shown as a blue sphere. The amino acid residues involved in co-ordinating the calcium and binding the sugar are shown in grey ‘liquorice’ representation, the bound xylo-oligosaccharide is shown in blue ‘liquorice’ representation and the C-α backbone is represented as grey cylinders.