Function

Alpha glucosidase (AGS) or maltase breaks down the 1,4-α bonds in starch or disaccharides to produce glucose. Maltase breaks down maltose. Isomaltase breaks the 1,6 bond.[1] See also Kennedy research.

Disease

AGS deficiency is the cause of Pompe Disease. AGS inhibitors are used as anti-diabetic drugs and can potentially prevent the fusion of HIV and hepatitis B virus to cells.

Structural highlights

(PDB code 3a4a).[2] Water molecules shown as red spheres.

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3D structures of α-glucosidase

Alpha-glucosidase 3D structures


Structure of yeast isomaltase complex with α-D-glucose and Ca+2 ion (green) (PDB code 3a4a).

Drag the structure with the mouse to rotate

ReferencesReferences

  1. Gloster TM, Turkenburg JP, Potts JR, Henrissat B, Davies GJ. Divergence of catalytic mechanism within a glycosidase family provides insight into evolution of carbohydrate metabolism by human gut flora. Chem Biol. 2008 Oct 20;15(10):1058-67. Epub 2008 Oct 9. PMID:18848471 doi:10.1016/j.chembiol.2008.09.005
  2. Yamamoto K, Miyake H, Kusunoki M, Osaki S. Crystal structures of isomaltase from Saccharomyces cerevisiae and in complex with its competitive inhibitor maltose. FEBS J. 2010 Oct;277(20):4205-14. doi: 10.1111/j.1742-4658.2010.07810.x., Epub 2010 Aug 31. PMID:20812985 doi:10.1111/j.1742-4658.2010.07810.x

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