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Literature summary extracted from

  • Lind, D.L.; Daniel, R.M.; Cowan, D.A.; Morgan, H.W.
    beta-Galactosidase from a strain of the anaerobic thermophile, Thermoanaerobacter (1989), Enzyme Microb. Technol., 11, 180-186.
No PubMed abstract available

Activating Compound

EC Number Activating Compound Comment Organism Structure
3.2.1.23 2-mercaptoethanol 1 mM, activates Thermoanaerobacter sp.
3.2.1.23 Cys 1 mM, activates Thermoanaerobacter sp.
3.2.1.23 dithiothreitol 1 mM, activates Thermoanaerobacter sp.
3.2.1.23 EDTA 1 mM, activates Thermoanaerobacter sp.

Inhibitors

EC Number Inhibitors Comment Organism Structure
3.2.1.23 Ca2+ 1.5 mM, 45% inhibition Thermoanaerobacter sp.
3.2.1.23 Co2+ 1.5 mM, complete inhibition Thermoanaerobacter sp.
3.2.1.23 Cu2+ 1.5 mM, complete inhibition Thermoanaerobacter sp.
3.2.1.23 Fe2+ 1.5 mM, complete inhibition Thermoanaerobacter sp.
3.2.1.23 Fe3+ 1.5 mM, complete inhibition Thermoanaerobacter sp.
3.2.1.23 Mg2+ 1.5 mM, 56% inhibition Thermoanaerobacter sp.
3.2.1.23 Ni2+ 1.5 mM, complete inhibition Thermoanaerobacter sp.
3.2.1.23 PCMB
-
Thermoanaerobacter sp.
3.2.1.23 phenylmethylsulfonyl fluoride
-
Thermoanaerobacter sp.
3.2.1.23 Zn2+ 1.5 mM, complete inhibition Thermoanaerobacter sp.

KM Value [mM]

EC Number KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
3.2.1.23 4.3
-
o-nitrophenyl-beta-D-galactoside
-
Thermoanaerobacter sp.

Localization

EC Number Localization Comment Organism GeneOntology No. Textmining
3.2.1.23 intracellular
-
Thermoanaerobacter sp. 5622
-

Metals/Ions

EC Number Metals/Ions Comment Organism Structure
3.2.1.23 K+ 0.1 M, activates Thermoanaerobacter sp.
3.2.1.23 Li+ 0.1 M, activates Thermoanaerobacter sp.
3.2.1.23 Na+ 0.1 M, activates Thermoanaerobacter sp.

Molecular Weight [Da]

EC Number Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
3.2.1.23 154000
-
gel filtration Thermoanaerobacter sp.

Organism

EC Number Organism UniProt Comment Textmining
3.2.1.23 Thermoanaerobacter sp.
-
-
-
3.2.1.23 Thermoanaerobacter sp. TP6-B1
-
-
-

Purification (Commentary)

EC Number Purification (Comment) Organism
3.2.1.23
-
Thermoanaerobacter sp.

Specific Activity [micromol/min/mg]

EC Number Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
3.2.1.23 99
-
at 70°C Thermoanaerobacter sp.

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
3.2.1.23 lactose + H2O
-
Thermoanaerobacter sp. D-glucose + D-galactose
-
?
3.2.1.23 lactose + H2O
-
Thermoanaerobacter sp. TP6-B1 D-glucose + D-galactose
-
?
3.2.1.23 methyl O-beta-galactoside + H2O
-
Thermoanaerobacter sp. methanol + beta-D-galactose
-
?
3.2.1.23 methyl O-beta-galactoside + H2O
-
Thermoanaerobacter sp. TP6-B1 methanol + beta-D-galactose
-
?
3.2.1.23 methylthio-beta-D-galactoside + H2O
-
Thermoanaerobacter sp. galactose + methanethiol
-
?
3.2.1.23 methylthio-beta-D-galactoside + H2O
-
Thermoanaerobacter sp. TP6-B1 galactose + methanethiol
-
?
3.2.1.23 o-nitrophenyl-beta-D-galactoside + H2O
-
Thermoanaerobacter sp. o-nitrophenol + beta-D-galactose
-
?
3.2.1.23 o-nitrophenyl-beta-D-galactoside + H2O
-
Thermoanaerobacter sp. TP6-B1 o-nitrophenol + beta-D-galactose
-
?
3.2.1.23 p-nitrophenyl alpha-L-arabinoside + H2O
-
Thermoanaerobacter sp. p-nitrophenol + alpha-L-arabinose
-
?
3.2.1.23 p-nitrophenyl alpha-L-arabinoside + H2O
-
Thermoanaerobacter sp. TP6-B1 p-nitrophenol + alpha-L-arabinose
-
?

Temperature Stability [°C]

EC Number Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
3.2.1.23 70
-
half-life: 220 min Thermoanaerobacter sp.
3.2.1.23 75
-
half-life: 155 min Thermoanaerobacter sp.

Turnover Number [1/s]

EC Number Turnover Number Minimum [1/s] Turnover Number Maximum [1/s] Substrate Comment Organism Structure
3.2.1.23 431
-
o-nitrophenyl-beta-D-galactoside
-
Thermoanaerobacter sp.

pH Optimum

EC Number pH Optimum Minimum pH Optimum Maximum Comment Organism
3.2.1.23 6
-
hydrolysis of o-nitrophenyl-beta-D-galactoside Thermoanaerobacter sp.

pH Range

EC Number pH Minimum pH Maximum Comment Organism
3.2.1.23 5.2 7.6 more than 50% of maximal activity at pH 5.2 and at pH 7.6 Thermoanaerobacter sp.