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Literature summary for 3.2.1.20 extracted from

  • Kita, A.; Matsui, H.; Somoto, A.; Kimura, A.; Takata, M.; Chiba, S.
    Substrate specificity and subsite affinities of crystalline alpha-glucosidase from Aspergillus niger (1991), Agric. Biol. Chem., 55, 2327-2335.
No PubMed abstract available

Crystallization (Commentary)

Crystallization (Comment) Organism
-
Aspergillus niger

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.34
-
phenyl alpha-glucoside
-
Aspergillus niger
0.69
-
maltotriose
-
Aspergillus niger
0.75
-
maltose
-
Aspergillus niger
0.87
-
Phenyl alpha-maltoside
-
Aspergillus niger
1.1
-
maltotetraose
-
Aspergillus niger
1.9
-
maltopentaose
-
Aspergillus niger
3.2
-
maltopentaose
-
Aspergillus niger
4.3
-
maltodextrin DP = 17 Aspergillus niger
4.6
-
kojibiose
-
Aspergillus niger
4.9
-
maltohexaose
-
Aspergillus niger
5.3
-
maltoheptaose
-
Aspergillus niger
8
-
isomaltose
-
Aspergillus niger
11
-
maltooctaose
-
Aspergillus niger
12
-
nigerose
-
Aspergillus niger

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
125000
-
x * 125000, SDS-PAGE Aspergillus niger

Organism

Organism UniProt Comment Textmining
Aspergillus niger
-
-
-

Posttranslational Modification

Posttranslational Modification Comment Organism
glycoprotein contains 25.5% carbohydrate Aspergillus niger

Purification (Commentary)

Purification (Comment) Organism
-
Aspergillus niger

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
amylose + H2O
-
Aspergillus niger alpha-D-glucose
-
?
isomaltose + H2O
-
Aspergillus niger 2 alpha-D-glucose
-
?
kojibiose + H2O
-
Aspergillus niger alpha-D-glucose + D-glucose
-
?
maltodextrin + H2O DP = 17 Aspergillus niger alpha-D-glucose
-
?
maltoheptaose + H2O
-
Aspergillus niger maltohexaose + D-glucose
-
?
maltohexaose + H2O
-
Aspergillus niger maltopentaose + D-glucose
-
?
maltooctaose + H2O
-
Aspergillus niger alpha-D-glucose
-
?
maltopentaose + H2O
-
Aspergillus niger alpha-D-glucose + ?
-
?
maltose + H2O
-
Aspergillus niger alpha-D-glucose + D-glucose
-
?
maltotetraose + H2O
-
Aspergillus niger alpha-D-glucose
-
?
maltotriose + H2O
-
Aspergillus niger maltose + D-glucose
-
?
nigerose + H2O
-
Aspergillus niger 2 alpha-D-glucose
-
?
phenyl alpha-D-glucoside + H2O
-
Aspergillus niger phenol + alpha-D-glucose
-
?
phenyl alpha-glucoside + H2O
-
Aspergillus niger alpha-D-glucose + phenol
-
?
phenyl alpha-maltoside + H2O
-
Aspergillus niger alpha-D-glucose + phenyl alpha-D-glucoside
-
?
starch + H2O soluble Aspergillus niger alpha-D-glucose
-
?

Subunits

Subunits Comment Organism
? x * 125000, SDS-PAGE Aspergillus niger

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
55
-
15 min, stable up to Aspergillus niger

Turnover Number [1/s]

Turnover Number Minimum [1/s] Turnover Number Maximum [1/s] Substrate Comment Organism Structure
1.83
-
phenyl alpha-glucoside
-
Aspergillus niger
32.3
-
kojibiose
-
Aspergillus niger
50.5
-
isomaltose
-
Aspergillus niger
88.4
-
nigerose
-
Aspergillus niger
127
-
maltooctaose
-
Aspergillus niger
127
-
maltodextrin DP = 17 Aspergillus niger
144
-
maltose
-
Aspergillus niger
146
-
maltoheptaose
-
Aspergillus niger
147
-
maltopentaose
-
Aspergillus niger
163
-
starch soluble Aspergillus niger
170
-
maltohexaose
-
Aspergillus niger
181
-
maltotriose
-
Aspergillus niger
181
-
Phenyl alpha-maltoside
-
Aspergillus niger
193
-
maltotetraose
-
Aspergillus niger

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
4.3
-
-
Aspergillus niger

pH Stability

pH Stability pH Stability Maximum Comment Organism
3.5 8 4°C, 24 h, stable Aspergillus niger