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Literature summary for 1.10.3.1 extracted from

  • Diwakar, S.K.; Mishra, S.K.
    Purification and biochemical characterization of ionically unbound polyphenol oxidase from Musa paradisiaca leaf (2011), Prep. Biochem. Biotechnol., 41, 187-200.
    View publication on PubMed

Activating Compound

Activating Compound Comment Organism Structure
ferulic acid activates Musa x paradisiaca
protocatechuic acid activates Musa x paradisiaca

Inhibitors

Inhibitors Comment Organism Structure
2-mercaptoethanol
-
Musa x paradisiaca
ascorbic acid
-
Musa x paradisiaca
Co2+
-
Musa x paradisiaca
EDTA
-
Musa x paradisiaca
K+
-
Musa x paradisiaca
kojic acid
-
Musa x paradisiaca
L-cysteine
-
Musa x paradisiaca
Na+
-
Musa x paradisiaca
Sodium azide
-
Musa x paradisiaca

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
8
-
catechol pH 7.0, 50°C Musa x paradisiaca
10
-
4-methylcatechol pH 7.0, 50°C Musa x paradisiaca

Metals/Ions

Metals/Ions Comment Organism Structure
Cu2+ activates Musa x paradisiaca
Fe2+ activates Musa x paradisiaca
Hg2+ activates Musa x paradisiaca
Mn2+ activates Musa x paradisiaca
Ni2+ activates Musa x paradisiaca

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
40000
-
? * 40000, SDS-PAGE Musa x paradisiaca

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
2 4-methylcatechol + O2 Musa x paradisiaca
-
2 4-methyl-1,2-benzoquinone + 2 H2O
-
?
2 catechol + O2 Musa x paradisiaca
-
2 1,2-benzoquinone + 2 H2O
-
?

Organism

Organism UniProt Comment Textmining
Musa x paradisiaca
-
-
-

Purification (Commentary)

Purification (Comment) Organism
native enzyme from leaves 2.54fold by ammonium sulfate fractionation and gel filtration Musa x paradisiaca

Source Tissue

Source Tissue Comment Organism Textmining
leaf
-
Musa x paradisiaca
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
2 4-methylcatechol + O2
-
Musa x paradisiaca 2 4-methyl-1,2-benzoquinone + 2 H2O
-
?
2 catechol + O2
-
Musa x paradisiaca 2 1,2-benzoquinone + 2 H2O
-
?

Subunits

Subunits Comment Organism
? ? * 40000, SDS-PAGE Musa x paradisiaca

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
50
-
-
Musa x paradisiaca

Temperature Range [°C]

Temperature Minimum [°C] Temperature Maximum [°C] Comment Organism
30 90 activity range Musa x paradisiaca

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
60 75 half-life values of the enzyme range from 17 to 77 min Musa x paradisiaca

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7
-
-
Musa x paradisiaca

pH Range

pH Minimum pH Maximum Comment Organism
4 9 activity range Musa x paradisiaca