ENTRY       EC 3.2.1.20
NAME        alpha-Glucosidase
            Maltase
            Glucoinvertase
            Glucosidosucrase
            Maltase-glucoamylase
CLASS       Hydrolases
            Glycosidases
            Hydrolysing O-glycosyl compounds
SYSNAME     alpha-D-Glucoside glucohydrolase
REACTION    Hydrolysis of terminal, non-reducing 1,4-linked alpha-D-glucose
            residues with release of alpha-D-glucose
SUBSTRATE   Maltose
            H2O
PRODUCT     alpha-D-Glucose
INHIBITOR   Castanospermine
COMMENT     This single entry covers a group of enzymes whose specificity is
            directed mainly towards the exohydrolysis of 1,4-alpha-glucosidic
            linkages, and that hydrolyse oligosaccharides rapidly, relative
            to polysaccharides, which are hydrolysed relatively slowly, or
            not at all.  The intestinal enzyme also hydrolyses poly-
            saccharides, catalysing the reactions of EC 3.2.1.3, and, more
            slowly, hydrolyses 1,6-alpha-D-glucose links.
PATHWAY     PATH: MAP00052  Galactose metabolism
            PATH: MAP00500  Starch and sucrose metabolism
MOTIF       PS: PS00025  R-x(2)-C-x-[FYPST]-x(3,4)-[ST]-x(3)-C-x(4)-C-C-[FYWH]
            PS: PS00129  [GF]-[LIVM]-W-x-D-M-N-E
            PS: PS00707  G-A-D-[LIVM]-C-G-F-x(3)-[ST]-x(3)-L-C-x-R-W-x(2)-L-G-
                         [SA]-F-x-P-F-x-R-N
GENES       ECO: b0403(malZ)
            BSU: ycdG
            SCE: YBR299W(MAL3S) YGR287C(FSP2) YGR292W(MAL1S) YIL172C
                 YJL216C(J0228) YJL221C(J0218)
            HSA: GAA(Hs.1437) GANAB GANC
STRUCTURES  PDB: 1VAD  
DBLINKS     University of Geneva ENZYME DATA BANK: 3.2.1.20
            WIT (What Is There) Metabolic Reconstruction: 3.2.1.20
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