Any feedback?
Please rate this page
(literature.php)
(0/150)

BRENDA support

Literature summary for 1.14.18.1 extracted from

  • Ayaz, F.A.; Demir, O.; Torun, H.; Kolcuoglu, Y.; Colak, A.
    Characterization of polyphenoloxidase (PPO) and total phenolic contents in medlar (Mespilus germanica L.) fruit during ripening and over ripening (2007), Food Chem., 106, 291-298.
No PubMed abstract available

Inhibitors

Inhibitors Comment Organism Structure
Al3+ strongly inhibited diphenolase activity at ripening stage 1 and 2 Mespilus germanica
ascorbic acid
-
Mespilus germanica
Ca2+ strongly inhibited diphenolase activity at ripening stage 3 Mespilus germanica
Cu2+ strongly inhibited diphenolase activity at ripening stage 1 and 2 Mespilus germanica
Hg2+ strongly inhibited diphenolase activity at ripening stage 1 and 2 Mespilus germanica
Sodium azide
-
Mespilus germanica
Sodium metabisulfite for all ripening stages sodium metabisulfite inhibits PPO activity Mespilus germanica
Thiourea
-
Mespilus germanica

Organism

Organism UniProt Comment Textmining
Mespilus germanica
-
-
-

Source Tissue

Source Tissue Comment Organism Textmining
fruit
-
Mespilus germanica
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
4-methylcatechol + 1/2 O2 best substrate Mespilus germanica 4-methyl-1,2-benzoquinone + H2O
-
?
catechol + 1/2 O2
-
Mespilus germanica 1,2-benzoquinone + H2O
-
?
L-3,4-dihydroxyphenylalanine + 1/2 O2
-
Mespilus germanica L-dopaquinone + H2O
-
?
L-tyrosine + O2 + AH2
-
Mespilus germanica L-dopa + H2O + A
-
?

Synonyms

Synonyms Comment Organism
polyphenoloxidase
-
Mespilus germanica

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
20
-
ripening stage 2 Mespilus germanica
30
-
ripening stage 1 and 3 Mespilus germanica

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
4
-
ripening stage 2 Mespilus germanica
5
-
ripening stage 3 Mespilus germanica
7
-
ripening stage 1, highest enzyme activity throughout ripening Mespilus germanica

pH Range

pH Minimum pH Maximum Comment Organism
3 9
-
Mespilus germanica

IC50 Value

IC50 Value IC50 Value Maximum Comment Organism Inhibitor Structure
0.05
-
at ripening stage 3 Mespilus germanica Sodium azide
0.06
-
at ripening stage 1 Mespilus germanica Sodium azide
0.06
-
at ripening stage 2 Mespilus germanica Sodium azide
0.08
-
at ripening stage 3 Mespilus germanica ascorbic acid
0.09
-
at ripening stage 1 Mespilus germanica ascorbic acid
0.1
-
at ripening stage 2 Mespilus germanica ascorbic acid
1.49
-
at ripening stage 3 Mespilus germanica Thiourea
1.5
-
at ripening stage 1 Mespilus germanica Thiourea
1.73
-
at ripening stage 2 Mespilus germanica Thiourea
9
-
at ripening stage 3 Mespilus germanica Sodium metabisulfite
23.8
-
at ripening stage 1 Mespilus germanica Sodium metabisulfite
41
-
at ripening stage 2 Mespilus germanica Sodium metabisulfite