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Literature summary for 3.2.1.20 extracted from

  • Fonseca, F.V.; Silva, J.R.; Samuels, R.I.; DaMatta, R.A.; Terra, W.R.; Silva, C.P.
    Purification and partial characterization of a midgut membrane-bound alpha-glucosidase from Quesada gigas (Hemiptera: Cicadidae) (2010), Comp. Biochem. Physiol. B, 155, 20-25.
    View publication on PubMed

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
1.02
-
maltotetraose
-
Quesada gigas
1.34
-
maltotriose
-
Quesada gigas
1.58
-
p-nitrophenyl alpha-D-glucoside
-
Quesada gigas
3.27
-
maltoheptaose
-
Quesada gigas
3.62
-
maltohexaose
-
Quesada gigas
3.99
-
maltopentaose
-
Quesada gigas
5.46
-
maltose
-
Quesada gigas
10.8
-
sucrose
-
Quesada gigas

Localization

Localization Comment Organism GeneOntology No. Textmining
membrane perimicrovillar membranes Quesada gigas 16020
-
soluble
-
Quesada gigas
-
-

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
61000
-
SDS-PAGE Quesada gigas

Organism

Organism UniProt Comment Textmining
Quesada gigas
-
-
-

Purification (Commentary)

Purification (Comment) Organism
gel filtration and ion-exchange Quesada gigas

Source Tissue

Source Tissue Comment Organism Textmining
midgut
-
Quesada gigas
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
4-nitrophenyl alpha-D-glucoside + H2O assay at pH 6.0, 30°C Quesada gigas 4-nitrophenol + D-glucose
-
?
maltoheptaose + H2O assay at pH 6.0, 30°C Quesada gigas D-glucose + ?
-
?
maltohexaose + H2O assay at pH 6.0, 30°C Quesada gigas D-glucose + ?
-
?
maltopentaose + H2O assay at pH 6.0, 30°C Quesada gigas D-glucose + ?
-
?
maltose + H2O assay at pH 6.0, 30°C Quesada gigas D-glucose + ?
-
?
maltotetraose + H2O assay at pH 6.0, 30°C Quesada gigas D-glucose + ?
-
?
maltotriose + H2O assay at pH 6.0, 30°C Quesada gigas D-glucose + ?
-
?
sucrose + H2O assay at pH 6.0, 30°C Quesada gigas D-glucose + D-fructose
-
?

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
30
-
assay at Quesada gigas

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
6
-
-
Quesada gigas

General Information

General Information Comment Organism
physiological function possible role of enzyme in xylem fluid digestion and in osmoregulation Quesada gigas