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Literature summary for 3.2.1.20 extracted from

  • Muto, N.; Nakamura, T.; Yamamoto, I.
    Enzymatic formation of a nonreducing L-ascorbic acid alpha-glucoside: purification and properties of alpha-glucosidases catalyzing site-specific transglucosylation from rat small intestine (1990), J. Biochem., 107, 222-227.
    View publication on PubMed

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
1.15
-
maltose hydrolysis, alpha-glucosidase I Rattus norvegicus
1.9
-
maltose transglucosylation, alpha-glucosidase II Rattus norvegicus
2.13
-
maltose hydrolysis, alpha-glucosidase II Rattus norvegicus
2.98
-
maltose transglucosylation, alpha-glucosidase I Rattus norvegicus
7.2
-
L-ascorbic acid alpha-D-glucoside alpha-glucosidase I Rattus norvegicus
9.2
-
L-ascorbic acid alpha-D-glucoside alpha-glucosidase II Rattus norvegicus

Localization

Localization Comment Organism GeneOntology No. Textmining
membrane bound Rattus norvegicus 16020
-

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
270000
-
alpha-glucosidase II, gel filtration Rattus norvegicus
560000
-
alpha-glucosidase I, gel filtration Rattus norvegicus

Organism

Organism UniProt Comment Textmining
Rattus norvegicus
-
-
-

Purification (Commentary)

Purification (Comment) Organism
-
Rattus norvegicus

Source Tissue

Source Tissue Comment Organism Textmining
intestine small intestine Rattus norvegicus
-
intestine microvillus Rattus norvegicus
-

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
23.6
-
alpha-glucosidase II Rattus norvegicus
60.6
-
alpha-glucosidase I Rattus norvegicus

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
L-ascorbic acid alpha-D-glucoside
-
Rattus norvegicus maltose + L-ascorbic acid
-
r
L-ascorbic acid alpha-D-glucoside + H2O
-
Rattus norvegicus maltose + L-ascorbic acid
-
r
maltose + L-ascorbic acid
-
Rattus norvegicus L-ascorbic acid alpha-D-glucoside
-
r

Subunits

Subunits Comment Organism
More 3 bands detected by SDS-PAGE of alpha-glucosidase I: 130000 Da, 210000 Da and 330000 Da. A major band of 135000 Da and a minor band of 145000 Da is detected by SDS-PAGE of alpha-glucosidase II Rattus norvegicus

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
60
-
-
Rattus norvegicus

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
4.5 5 hydrolysis of maltose Rattus norvegicus
6 6.5 formation of L-ascorbic acid alpha-glucoside Rattus norvegicus