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Alpha-Amylase
Exploring the Structure
The active site of alpha-amylase contains a trio of acidic groups (colored white and red) that do most of the work. In the amylase shown here (PDB entry 1ppi), glutamate 233, aspartate 197, and aspartate 300 work together to cleave the connection between two sugars in a starch chain. This structure contains a short chain of five sugar units (colored yellow and orange) bound in the active site. The site of cleavage is shown in pink. A calcium ion, shown as the large gray sphere, is found nearby where it stabilizes the structure of the enzyme. A chloride ion, shown as a green sphere, is bound underneath the active site in many amylases, where it may assist the reaction.
This picture was created with RasMol. You can create similar illustrations by clicking on the accession codes here and picking one of the options under Display Molecule.
A list of alpha-amylase related entries in the PDB as determined by a keyword search on February 03, 2006 is available here. For more information on alpha-amylase, click here.
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