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| Description: (a) Pyruvate kinase is an enzyme that consists of four identical polypeptide chains. Each chain has an active site and a binding site for a regulatory molecule. (b) When regulatory molecules (red) bind to the allosteric sites, the overall shape of the enzyme changes. The change makes the enzyme functional. Here, substrate molecules ( yellow) are bound to the active sites. Small green balls are magnesium ions.
Picture Stats: Views: 57 Filesize: 195.81kB Height: 760 Width: 1704 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=49508 Keywords: Comparing uncontrolled and controlled energy release |