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Literature summary for 3.2.1.20 extracted from

  • Im, H.; Henson, C.A.
    Characterization of high pI alpha-glucosidase from germinated barley seeds: substrate specificity subsite affinities and active-site residues (1995), Carbohydr. Res., 277, 145-159.
No PubMed abstract available

Inhibitors

Inhibitors Comment Organism Structure
conduritol B epoxide
-
Hordeum vulgare
D-glucose hydrolysis of p-nitrophenyl alpha-glucoside Hordeum vulgare
N-bromosuccinimide
-
Hordeum vulgare
Phenylglyoxal
-
Hordeum vulgare
pyridoxal 5'-phosphate
-
Hordeum vulgare

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
1.04
-
p-nitrophenyl alpha-glucoside
-
Hordeum vulgare
1.11
-
maltotriose
-
Hordeum vulgare
1.29
-
nigerose
-
Hordeum vulgare
1.91
-
maltose
-
Hordeum vulgare
2.37
-
maltotetraose
-
Hordeum vulgare
2.92
-
maltopentaose
-
Hordeum vulgare
5.32
-
isomaltose
-
Hordeum vulgare
5.44
-
maltohexaose
-
Hordeum vulgare
7.89
-
maltoheptaose
-
Hordeum vulgare

Organism

Organism UniProt Comment Textmining
Hordeum vulgare
-
-
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
isomaltose + H2O
-
Hordeum vulgare 2 alpha-D-glucose
-
?
maltoheptaose + H2O
-
Hordeum vulgare maltohexaose + D-glucose
-
?
maltohexaose + H2O
-
Hordeum vulgare maltopentaose + D-glucose
-
?
maltopentaose + H2O
-
Hordeum vulgare alpha-D-glucose + ?
-
?
maltose + H2O
-
Hordeum vulgare alpha-D-glucose + D-glucose
-
?
maltotetraose + H2O
-
Hordeum vulgare alpha-D-glucose
-
?
maltotriose + H2O
-
Hordeum vulgare maltose + D-glucose
-
?
nigerose + H2O
-
Hordeum vulgare 2 alpha-D-glucose
-
?
p-nitrophenyl-alpha-D-glucopyranoside + H2O
-
Hordeum vulgare 4-nitrophenol + D-glucose
-
?
trehalose + H2O no activity Hordeum vulgare alpha-D-glucose
-
?

Turnover Number [1/s]

Turnover Number Minimum [1/s] Turnover Number Maximum [1/s] Substrate Comment Organism Structure
6.02
-
maltose
-
Hordeum vulgare
6.26
-
maltohexaose
-
Hordeum vulgare
6.65
-
maltotriose
-
Hordeum vulgare
6.67
-
maltoheptaose
-
Hordeum vulgare
6.98
-
maltotetraose
-
Hordeum vulgare
7.15
-
maltopentaose
-
Hordeum vulgare