Molecular surface representation of a mammalian alpha-amylase (PDB ID 1PPI) and its substrate amylopectin. The sugar component is printed in flexible TPU and can be inserted and removed from the amylase catalytic site. The model is great for explaining the structure of starch and its degradation by amylolytic enzymes. 

The atomic coordinates of amylose and amylopectin are from Proteopedia - Life in 3D - a collaborative & free 3D-encyclopedia of proteins & other biomolecules.