KEGG   ENZYME: 3.2.1.193Help
Entry
EC 3.2.1.193                Enzyme                                 

Name
ginsenosidase type I
Class
Hydrolases;
Glycosylases;
Glycosidases, i.e. enzymes that hydrolyse O- and S-glycosyl compounds
BRITE hierarchy
Sysname
ginsenoside glucohydrolase
Reaction(IUBMB)
(1) a protopanaxadiol-type ginsenoside with two glucosyl residues at position 3 + H2O = a protopanaxadiol-type ginsenoside with one glucosyl residue at position 3 + D-glucopyranose;
(2) a protopanaxadiol-type ginsenoside with one glucosyl residue at position 3 + H2O = a protopanaxadiol-type ginsenoside with no glycosidic modifications at position 3 + D-glucopyranose;
(3) a protopanaxadiol-type ginsenoside with two glycosyl residues at position 20 + H2O = a protopanaxadiol-type ginsenoside with a single glucosyl residue at position 20 + a monosaccharide
Substrate
protopanaxadiol-type ginsenoside with two glucosyl residues at position 3;
H2O [CPD:C00001];
protopanaxadiol-type ginsenoside with one glucosyl residue at position 3;
protopanaxadiol-type ginsenoside with two glycosyl residues at position 20
Product
protopanaxadiol-type ginsenoside with one glucosyl residue at position 3;
D-glucopyranose [CPD:C00031];
protopanaxadiol-type ginsenoside with no glycosidic modifications at position 3;
protopanaxadiol-type ginsenoside with a single glucosyl residue at position 20;
monosaccharide
Comment
Ginsenosidase type I is slightly activated by Mg2+ or Ca2+ [1]. The enzyme hydrolyses the 3-O-beta-D-(1->2)-glucosidic bond, the 3-O-beta-D-glucopyranosyl bond and the 20-O-beta-D-(1->6)-glycosidic bond of protopanaxadiol-type ginsenosides. It usually leaves a single glucosyl residue attached at position 20 and one or no glucosyl residues at position 3. Starting with a ginsenoside that is glycosylated at both positions (e.g. ginsenoside Rb1, Rb2, Rb3, Rc or Rd), the most common products are ginsenoside F2 and ginsenoside C-K, with low amounts of ginsenoside Rh2.
History
EC 3.2.1.193 created 2014
Reference
1  [PMID:17268094]
  Authors
Yu H, Zhang C, Lu M, Sun F, Fu Y, Jin F
  Title
Purification and characterization of new special ginsenosidase hydrolyzing multi-glycisides of protopanaxadiol ginsenosides, ginsenosidase type I.
  Journal
Chem. Pharm. Bull. (Tokyo). 55 (2007) 231-5.
Other DBs
ExplorEnz - The Enzyme Database: 
IUBMB Enzyme Nomenclature: 
ExPASy - ENZYME nomenclature database: 
BRENDA, the Enzyme Database: 

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