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Literature summary for 3.2.1.167 extracted from

  • Zhang, Y.; Wu, H.; Li, L.; Li, J.; Jiang, Z.; Jiang, Y.; Chen, Y.
    Enzymatic conversion of baicalin into baicalein by beta-glucuronidase encapsulated in biomimetic core-shell structured hybrid capsules (2009), J. Mol. Catal. B, 57, 130-135.
No PubMed abstract available

General Stability

General Stability Organism
no appreciable loss in activity is found during 10 repeated reaction cycles of GUS encapsulated in biomimetic alginate/protamine/silica capsules Escherichia coli

Organism

Organism UniProt Comment Textmining
Escherichia coli
-
-
-

Storage Stability

Storage Stability Organism
4°C, free enzyme in 30 mM Tris–HCl (pH 7.0), 11 days, about 25% loss of activity Escherichia coli
4°C, free enzyme in 30 mM Tris–HCl (pH 7.0), 26 days, 96% loss of activity Escherichia coli
4°C, free enzyme in 30 mM Tris–HCl (pH 7.0), 5 days, about 20% loss of activity Escherichia coli
4°C, GUS encapsulated in biomimetic alginate/protamine/silica capsules in 30 mM Tris–HCl (pH 7.0), 11 days, no loss of activity Escherichia coli
4°C, GUS encapsulated in biomimetic alginate/protamine/silica capsules in 30 mM Tris–HCl (pH 7.0), 26 days, 10% loss of activity Escherichia coli

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
baicalin + H2O
-
Escherichia coli baicalein + D-glucuronate
-
?

Synonyms

Synonyms Comment Organism
beta-glucuronidase
-
Escherichia coli
GUS
-
Escherichia coli

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
37
-
optimal temperature for the conversion of baicalin to baicalein Escherichia coli
60
-
for GUS free or encapsulated in biomimetic alginate/protamine/silica capsules Escherichia coli

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
30 70 compared with the activity after being incubated at 30°C, 92% of activity retained after being incubated at 50°C for encapsulated GUS, whereas 57% of the free GUS activity retained after the same treatment. Encapsulated GUS retains about 20% activity at 60°C and is inactivated at 70°C, while free enzyme is already inactive at 60°C Escherichia coli

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7
-
for GUS free or encapsulated in biomimetic alginate/protamine/silica capsules Escherichia coli

pH Stability

pH Stability pH Stability Maximum Comment Organism
4 8 encapsulated enzyme retains more than 80% of activity after being incubated at pH 4.0-5.0, about 90% activity at pH 6.0, and 100% activity at pH 7.0-8.0. Free enzyme shows no activity at pH 4.0, about 30% activity at pH 6.0, about 80% activity at pH 6.0, 100% activity at pH 7.0, and about 75% activity at pH 8.0 Escherichia coli