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Literature summary for 3.2.1.23 extracted from

  • Lim, S.; Kim, G.; Yi, S.; Lee, B.H.
    Characteristics of a Bifidobacterium longum LL04 beta-galactosidase (recombinant) produced in Escherichia coli (2006), Food Sci. Biotechnol., 15, 908-913.
No PubMed abstract available

Cloned(Commentary)

Cloned (Comment) Organism
expression in Escherichia coli Bifidobacterium longum

Inhibitors

Inhibitors Comment Organism Structure
additional information strong inhibition by most divalent metal ions Bifidobacterium longum

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.51
-
2-nitrophenyl-beta-D-galactopyranoside pH 7.0, 50°C Bifidobacterium longum
0.72
-
2-nitrophenyl-beta-D-galactopyranoside pH 7.0, 37°C Bifidobacterium longum

Metals/Ions

Metals/Ions Comment Organism Structure
K+ activates Bifidobacterium longum
Na+ activates Bifidobacterium longum

Organism

Organism UniProt Comment Textmining
Bifidobacterium longum
-
-
-
Bifidobacterium longum LL04
-
-
-

Purification (Commentary)

Purification (Comment) Organism
recombinant enzyme from Escherichia coli partially by ammonium sulfate fractionation and anion exchange chromatography Bifidobacterium longum

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
additional information
-
-
Bifidobacterium longum

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
2-nitrophenyl beta-D-galactopyranoside + H2O
-
Bifidobacterium longum 2-nitrophenol + beta-D-galactose
-
?
2-nitrophenyl beta-D-galactopyranoside + H2O
-
Bifidobacterium longum LL04 2-nitrophenol + beta-D-galactose
-
?

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
50
-
-
Bifidobacterium longum

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
40
-
purified recombinant enzyme, over 60 min, pH 7.0, stable Bifidobacterium longum

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7 8
-
Bifidobacterium longum

pH Stability

pH Stability pH Stability Maximum Comment Organism
5 9 purified recombinant enzyme, stable Bifidobacterium longum