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Literature summary for 3.2.1.23 extracted from

  • Hung, M.N.; Lee, B.H.
    Purification and characterization of a recombinant beta-galactosidase with transgalactosylation activity from Bifidobacterium infantis HL96 (2002), Appl. Microbiol. Biotechnol., 58, 439-445.
    View publication on PubMed

Cloned(Commentary)

Cloned (Comment) Organism
expression in Escherichia coli Bifidobacterium longum subsp. infantis

Inhibitors

Inhibitors Comment Organism Structure
Cr3+
-
Bifidobacterium longum subsp. infantis
EDTA
-
Bifidobacterium longum subsp. infantis
galactose inhibits hydrolysis of lactose Bifidobacterium longum subsp. infantis
PCMB
-
Bifidobacterium longum subsp. infantis
Urea
-
Bifidobacterium longum subsp. infantis

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
2.6
-
o-nitrophenyl beta-D-galactopyranoside
-
Bifidobacterium longum subsp. infantis

Metals/Ions

Metals/Ions Comment Organism Structure
K+ 10 mM, required Bifidobacterium longum subsp. infantis
Na+ 10 mM, required Bifidobacterium longum subsp. infantis

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
115000
-
4 * 115000, SDS-PAGE Bifidobacterium longum subsp. infantis
470000
-
nondenaturing PAGE Bifidobacterium longum subsp. infantis

Organism

Organism UniProt Comment Textmining
Bifidobacterium longum subsp. infantis
-
-
-
Bifidobacterium longum subsp. infantis HL96
-
-
-

Purification (Commentary)

Purification (Comment) Organism
-
Bifidobacterium longum subsp. infantis

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
lactose + H2O
-
Bifidobacterium longum subsp. infantis D-glucose + D-galactose
-
?
lactose + H2O
-
Bifidobacterium longum subsp. infantis HL96 D-glucose + D-galactose
-
?
additional information strong transgalactosylation activity Bifidobacterium longum subsp. infantis ?
-
?
additional information strong transgalactosylation activity Bifidobacterium longum subsp. infantis HL96 ?
-
?
o-nitrophenyl beta-D-galactopyranoside + H2O
-
Bifidobacterium longum subsp. infantis o-nitrophenol + beta-D-galactose
-
?
o-nitrophenyl beta-D-galactopyranoside + H2O
-
Bifidobacterium longum subsp. infantis HL96 o-nitrophenol + beta-D-galactose
-
?

Subunits

Subunits Comment Organism
tetramer 4 * 115000, SDS-PAGE Bifidobacterium longum subsp. infantis

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
50
-
hydrolysis of o-nitrophenyl beta-D-galactopyranoside Bifidobacterium longum subsp. infantis
60
-
hydrolysis of lactose Bifidobacterium longum subsp. infantis

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
50
-
pH 7.0, 80 min, stable Bifidobacterium longum subsp. infantis

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7.5
-
hydrolysis of lactose or o-nitrophenyl beta-D-galactopyranoside Bifidobacterium longum subsp. infantis

pH Stability

pH Stability pH Stability Maximum Comment Organism
5 8.5 stable over the range Bifidobacterium longum subsp. infantis