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2,4-dichlorophenol + FADH2 + O2
2,4-dichlorocatechol + FAD + H2O
2-aminophenol + O2 + NADPH
?
-
Substrates: -
Products: -
?
2-chlorophenol + FADH2 + O2
2-chlorocatechol + FAD + H2O
2-chlorophenol + O2 + NADPH
?
2-methyl-phenol + O2 + NADPH
?
-
Substrates: -
Products: -
?
3-aminophenol + O2 + NADPH
?
-
Substrates: -
Products: -
?
3-chlorophenol + O2 + NADPH
?
3-methylphenol + O2 + NADPH
?
-
Substrates: -
Products: -
?
3-nitrophenol + NAD(P)H + H+ + O2
? + NAD(P)+ + H2O
4-aminophenol + O2 + NADPH
?
-
Substrates: -
Products: -
?
4-chlorophenol + FADH2 + O2
4-chlorocatechol + FAD + H2O
4-chlorophenol + O2 + NADPH
?
4-methyl-phenol + O2 + NADPH
?
-
Substrates: -
Products: -
?
4-methylphenol + FADH2 + O2
4-methylcatechol + FAD + H2O
Substrates: -
Products: -
?
4-nitrophenol + NAD(P)H + H+ + O2
? + NAD(P)+ + H2O
catechol + FMN + H2O
phenol + FMNH2 + O2
Substrates: -
Products: -
r
catechol + riboflavin + H2O
phenol + reduced riboflavin + O2
Substrates: -
Products: -
r
phenol + FADH2 + O2
catechol + FAD + H2O
phenol + FMNH2 + O2
catechol + FMN + H2O
phenol + NAD(P)H + H+ + O2
catechol + NAD(P)+ + H2O
phenol + NADH + H+ + O2
catechol + NAD+ + H2O
phenol + NADPH + O2
?
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Substrates: first step of phenol degradation
Products: -
?
phenol + NADPH + O2
catechol + NADP+ + H2O
phenol + reduced riboflavin + O2
catechol + riboflavin + H2O
phloroglucinol + O2 + NADPH
?
-
Substrates: -
Products: -
?
pyrogallol + O2 + NADPH
?
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Substrates: -
Products: -
?
quinol + O2 + NADPH
1,2,4-trihydroxybenzene + NADP+ + H2O
-
Substrates: -
Products: -
?
resorcinol + NAD(P)H + H+ + O2
? + NAD(P)+ + H2O
resorcinol + NADPH + O2
?
-
Substrates: -
Products: -
?
additional information
?
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2,4-dichlorophenol + FADH2 + O2
2,4-dichlorocatechol + FAD + H2O
Substrates: -
Products: -
?
2,4-dichlorophenol + FADH2 + O2
2,4-dichlorocatechol + FAD + H2O
Substrates: -
Products: -
?
2-chlorophenol + FADH2 + O2
2-chlorocatechol + FAD + H2O
Substrates: -
Products: -
?
2-chlorophenol + FADH2 + O2
2-chlorocatechol + FAD + H2O
Substrates: poor substrate for isozyme PheA1(1)
Products: -
?
2-chlorophenol + FADH2 + O2
2-chlorocatechol + FAD + H2O
Substrates: -
Products: -
?
2-chlorophenol + FADH2 + O2
2-chlorocatechol + FAD + H2O
Substrates: poor substrate for isozyme PheA1(1)
Products: -
?
2-chlorophenol + O2 + NADPH
?
-
Substrates: -
Products: -
?
2-chlorophenol + O2 + NADPH
?
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Substrates: -
Products: -
?
3-chlorophenol + O2 + NADPH
?
-
Substrates: -
Products: -
?
3-chlorophenol + O2 + NADPH
?
-
Substrates: -
Products: -
?
3-nitrophenol + NAD(P)H + H+ + O2
? + NAD(P)+ + H2O
Substrates: -
Products: -
?
3-nitrophenol + NAD(P)H + H+ + O2
? + NAD(P)+ + H2O
Substrates: -
Products: -
?
4-chlorophenol + FADH2 + O2
4-chlorocatechol + FAD + H2O
Substrates: -
Products: -
?
4-chlorophenol + FADH2 + O2
4-chlorocatechol + FAD + H2O
Substrates: -
Products: -
?
4-chlorophenol + O2 + NADPH
?
-
Substrates: -
Products: -
?
4-chlorophenol + O2 + NADPH
?
-
Substrates: -
Products: -
?
4-nitrophenol + NAD(P)H + H+ + O2
? + NAD(P)+ + H2O
Substrates: -
Products: -
?
4-nitrophenol + NAD(P)H + H+ + O2
? + NAD(P)+ + H2O
Substrates: -
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
-
Substrates: a two-component enzyme system: the smaller flavin reductase PheA2 component catalyzes the NADH-dependent reduction of free FAD according to a ping pong bisubstrate-biproduct mechanism. The reduced FAD is then used by the larger oxygenase component PheA1 to hydroxylate phenols to the corresponding catechols
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: PheA1 is required for activity, no activity by PheA2 alone. PheA2 acts according to a ping pong bi bi reaction mechanism in which NADH reduces the FAD cofactor, which in turn transfers electrons to the FAD substrate
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
-
Substrates: reactive exogenous FAD substrate binds in the NADH cleft after release of NAD product. PheA2 is able to bind one FAD cofactor and one FAD substrate
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
-
Substrates: a two-component enzyme system: the smaller flavin reductase PheA2 component catalyzes the NADH-dependent reduction of free FAD according to a ping pong bisubstrate-biproduct mechanism. The reduced FAD is then used by the larger oxygenase component PheA1 to hydroxylate phenols to the corresponding catechols
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
-
Substrates: reactive exogenous FAD substrate binds in the NADH cleft after release of NAD product. PheA2 is able to bind one FAD cofactor and one FAD substrate
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: PheA1 is required for activity, no activity by PheA2 alone. PheA2 acts according to a ping pong bi bi reaction mechanism in which NADH reduces the FAD cofactor, which in turn transfers electrons to the FAD substrate
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
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phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: hydroxylation of phenol in vitro requires the presence of both PheA1 and PheA2 components, in addition to NADH and FAD, but the physical interaction between the proteins is not necessary for the reaction, Km for FAD is 0.0134 mM, Km for NADH is 0.0533 mM. The hydroxylation of phenol in vitro depends on the molar ratio of His6PheA2 and His6PheA1 present in the reaction mixture, an increase of the amount of His6PheA1 in the assay results in a higher phenol hydroxylase activity. In the assay, a reductase/oxygenase molar ratio of 1:10 is used
Products: -
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phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: hydroxylation of phenol in vitro requires the presence of both PheA1 and PheA2 components, in addition to NADH and FAD, but the physical interaction between the proteins is not necessary for the reaction. The hydroxylation of phenol in vitro depends on the molar ratio of His6PheA2 and His6PheA1 present in the reaction mixture, an increase of the amount of His6PheA1 in the assay results in a higher phenol hydroxylase activity. In the assay, a reductase/oxygenase molar ratio of 1:10 is used
Products: -
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phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
?
phenol + FMNH2 + O2
catechol + FMN + H2O
Substrates: -
Products: -
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phenol + FMNH2 + O2
catechol + FMN + H2O
Substrates: -
Products: -
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phenol + NAD(P)H + H+ + O2
catechol + NAD(P)+ + H2O
-
Substrates: -
Products: -
?
phenol + NAD(P)H + H+ + O2
catechol + NAD(P)+ + H2O
Substrates: hydroxylation of phenol in vitro requires the presence of both His6PheA1 and His6PheA2 components, in addition to NADH and FAD, but the physical interaction between the proteins is not necessary for the reaction
Products: -
?
phenol + NAD(P)H + H+ + O2
catechol + NAD(P)+ + H2O
Substrates: hydroxylation of phenol in vitro requires the presence of both His6PheA1 and His6PheA2 components, in addition to NADH and FAD, but the physical interaction between the proteins is not necessary for the reaction
Products: -
?
phenol + NADH + H+ + O2
catechol + NAD+ + H2O
Substrates: the two-protein system phenol hydroxylase consists of an oxygenase (PheA1) and a flavin reductase (PheA2). PheA1 catalyzes the efficient ortho-hydroxylation of phenol to catechol when supplemented with PheA2 and FAD/NADH. PheA1 catalyzes the NADH-dependent reduction of free flavins according to a ping pong bi bi mechanism
Products: -
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phenol + NADH + H+ + O2
catechol + NAD+ + H2O
Substrates: the two-protein system phenol hydroxylase consists of an oxygenase (PheA1) and a flavin reductase (PheA2). PheA1 catalyzes the efficient ortho-hydroxylation of phenol to catechol when supplemented with PheA2 and FAD/NADH. PheA1 catalyzes the NADH-dependent reduction of free flavins according to a ping pong bi bi mechanism
Products: -
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phenol + NADH + H+ + O2
catechol + NAD+ + H2O
Substrates: -
Products: -
r
phenol + NADH + H+ + O2
catechol + NAD+ + H2O
Substrates: -
Products: -
r
phenol + NADPH + O2
catechol + NADP+ + H2O
-
Substrates: -
Products: -
?
phenol + NADPH + O2
catechol + NADP+ + H2O
-
Substrates: -
Products: -
?
phenol + reduced riboflavin + O2
catechol + riboflavin + H2O
Substrates: -
Products: -
?
phenol + reduced riboflavin + O2
catechol + riboflavin + H2O
Substrates: -
Products: -
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resorcinol + NAD(P)H + H+ + O2
? + NAD(P)+ + H2O
Substrates: -
Products: -
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resorcinol + NAD(P)H + H+ + O2
? + NAD(P)+ + H2O
Substrates: -
Products: -
?
additional information
?
-
-
Substrates: enzyme components PheA2 and PheA1 show no protein-protein interaction
Products: -
?
additional information
?
-
Substrates: enzyme components PheA2 and PheA1 show no protein-protein interaction
Products: -
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additional information
?
-
Substrates: enzyme components PheA2 and PheA1 show no protein-protein interaction
Products: -
?
additional information
?
-
-
Substrates: PheA1 is required for activity of flavin reductase PheA2, no activity by PheA1 or PheA2 alone
Products: -
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additional information
?
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Substrates: PheA1 is required for activity of flavin reductase PheA2, no activity by PheA1 or PheA2 alone
Products: -
?
additional information
?
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Substrates: PheA1 is required for activity of flavin reductase PheA2, no activity by PheA1 or PheA2 alone
Products: -
?
additional information
?
-
-
Substrates: enzyme components PheA2 and PheA1 show no protein-protein interaction
Products: -
?
additional information
?
-
Substrates: enzyme components PheA2 and PheA1 show no protein-protein interaction
Products: -
?
additional information
?
-
Substrates: enzyme components PheA2 and PheA1 show no protein-protein interaction
Products: -
?
additional information
?
-
-
Substrates: PheA1 is required for activity of flavin reductase PheA2, no activity by PheA1 or PheA2 alone
Products: -
?
additional information
?
-
Substrates: PheA1 is required for activity of flavin reductase PheA2, no activity by PheA1 or PheA2 alone
Products: -
?
additional information
?
-
Substrates: PheA1 is required for activity of flavin reductase PheA2, no activity by PheA1 or PheA2 alone
Products: -
?
additional information
?
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Substrates: the two-component phenol hydroxylase is completely unable to hydroxylate benzoate, 4-hydroxybenzoate, and orcinol
Products: -
?
additional information
?
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Substrates: the two-component phenol hydroxylase is completely unable to hydroxylate benzoate, 4-hydroxybenzoate, and orcinol
Products: -
?
additional information
?
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Substrates: the two-component phenol hydroxylase is completely unable to hydroxylate benzoate, 4-hydroxybenzoate, and orcinol
Products: -
?
additional information
?
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Substrates: the two-component phenol hydroxylase is completely unable to hydroxylate benzoate, 4-hydroxybenzoate, and orcinol
Products: -
?
additional information
?
-
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Substrates: the two-component phenol hydroxylase is completely unable to hydroxylate benzoate, 4-hydroxybenzoate, and orcinol
Products: -
?
additional information
?
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Substrates: substrate speccificities of the three isozymes, overview
Products: -
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additional information
?
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Substrates: substrate speccificities of the three isozymes, overview
Products: -
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additional information
?
-
-
Substrates: not: 3-nitrophenol, 4-nitrophenol
Products: -
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additional information
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-
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Substrates: not: 3-nitrophenol, 4-nitrophenol
Products: -
?
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2,4-dichlorophenol + FADH2 + O2
2,4-dichlorocatechol + FAD + H2O
2-chlorophenol + FADH2 + O2
2-chlorocatechol + FAD + H2O
4-chlorophenol + FADH2 + O2
4-chlorocatechol + FAD + H2O
4-methylphenol + FADH2 + O2
4-methylcatechol + FAD + H2O
Substrates: -
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
phenol + NADPH + O2
?
-
Substrates: first step of phenol degradation
Products: -
?
additional information
?
-
2,4-dichlorophenol + FADH2 + O2
2,4-dichlorocatechol + FAD + H2O
Substrates: -
Products: -
?
2,4-dichlorophenol + FADH2 + O2
2,4-dichlorocatechol + FAD + H2O
Substrates: -
Products: -
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2-chlorophenol + FADH2 + O2
2-chlorocatechol + FAD + H2O
Substrates: poor substrate for isozyme PheA1(1)
Products: -
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2-chlorophenol + FADH2 + O2
2-chlorocatechol + FAD + H2O
Substrates: poor substrate for isozyme PheA1(1)
Products: -
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4-chlorophenol + FADH2 + O2
4-chlorocatechol + FAD + H2O
Substrates: -
Products: -
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4-chlorophenol + FADH2 + O2
4-chlorocatechol + FAD + H2O
Substrates: -
Products: -
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phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
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phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
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phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
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phenol + FADH2 + O2
catechol + FAD + H2O
-
Substrates: a two-component enzyme system: the smaller flavin reductase PheA2 component catalyzes the NADH-dependent reduction of free FAD according to a ping pong bisubstrate-biproduct mechanism. The reduced FAD is then used by the larger oxygenase component PheA1 to hydroxylate phenols to the corresponding catechols
Products: -
?
phenol + FADH2 + O2
catechol + FAD + H2O
-
Substrates: a two-component enzyme system: the smaller flavin reductase PheA2 component catalyzes the NADH-dependent reduction of free FAD according to a ping pong bisubstrate-biproduct mechanism. The reduced FAD is then used by the larger oxygenase component PheA1 to hydroxylate phenols to the corresponding catechols
Products: -
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phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
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phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
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phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
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phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
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phenol + FADH2 + O2
catechol + FAD + H2O
Substrates: -
Products: -
?
additional information
?
-
-
Substrates: enzyme components PheA2 and PheA1 show no protein-protein interaction
Products: -
?
additional information
?
-
Substrates: enzyme components PheA2 and PheA1 show no protein-protein interaction
Products: -
?
additional information
?
-
Substrates: enzyme components PheA2 and PheA1 show no protein-protein interaction
Products: -
?
additional information
?
-
-
Substrates: enzyme components PheA2 and PheA1 show no protein-protein interaction
Products: -
?
additional information
?
-
Substrates: enzyme components PheA2 and PheA1 show no protein-protein interaction
Products: -
?
additional information
?
-
Substrates: enzyme components PheA2 and PheA1 show no protein-protein interaction
Products: -
?
additional information
?
-
Substrates: substrate speccificities of the three isozymes, overview
Products: -
?
additional information
?
-
Substrates: substrate speccificities of the three isozymes, overview
Products: -
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FAD
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FAD
PheA2 uses FAD both as a substrate and as a prosthetic group, strictly dependent on, neither FMN nor riboflavin can replace FAD in this reaction. PheA2 is a a homodimer, with each subunit containing a highly fluorescent FAD prosthetic group
FAD
activity of the oxygenase component His6PheA1 of phenol hydroxylase is strictly dependent on FAD
FADH2
-
FADH2
FAD is again reduced at the expense of NADH and NADPH
FADH2
FAD is bound to PheA2, binding structure analysis, overview
FADH2
-
PheA2 is a single domain homodimeric protein with each FAD-containing subunit being organized around a six-stranded beta-sheet and a capping alpha-helix. The tightly bound FAD prosthetic group binds near the dimer interface, and the re face of the FAD isoalloxazine ring is fully exposed to solvent, binding structure, overview
FMN
-
NADH
-
NADH
PheA2 uses NADH in order to reduce FAD, according to a random sequential kinetic mechanism
NADH
-
addition of NADH to crystalline PheA2 reduces the flavin cofactor, the NAD product is bound in a wide solvent-accessible groove adopting an unusual folded conformation with ring stacking, binding structure, overview
NADH
NADH is a much better coenzyme for PheA2 than NADPH
NADH
preferred compared to NADPH
NADPH
-
-
NADPH
can be used instead of NADH as electron donor, using either FAD or FMN as electron acceptor, but with an affinity 5fold or 10fold lower than NADH, respectively
additional information
-
reactive exogenous FAD substrate binds in the NADH cleft after release of NAD product. PheA2 is able to bind one FAD cofactor and one FAD substrate. PheA2 contains a dual binding cleft for NADH and FAD substrate, which alternate during catalysis. No activity with FMN, riboflavin, and NADPH
-
additional information
the flavoprotein monooxygenase uses electrons of NAD(P)H to activate and cleave a molecule of oxygen through the formation of an intermediate flavin hydroperoxide and enable the incorporation of an oxygen atom into the substrate
-
additional information
the flavoprotein monooxygenase uses electrons of NAD(P)H to activate and cleave a molecule of oxygen through the formation of an intermediate flavin hydroperoxide and enable the incorporation of an oxygen atom into the substrate
-
additional information
-
the free FAD acts as a true substrate. In addition to FAD, PheA2 is also active with FMN and riboflavin. The turnover rate of PheA2 with free flavins is strongly dependent on temperature. At 25°C, the activity with FMN and riboflavin is much higher than with FAD, but when the temperature is raised to 53°C, the turnover rates with the different flavins becomes nearly identical. Dichlorophenolindophenol is a poor cofactor
-
additional information
the free FAD acts as a true substrate. In addition to FAD, PheA2 is also active with FMN and riboflavin. The turnover rate of PheA2 with free flavins is strongly dependent on temperature. At 25°C, the activity with FMN and riboflavin is much higher than with FAD, but when the temperature is raised to 53°C, the turnover rates with the different flavins becomes nearly identical. Dichlorophenolindophenol is a poor cofactor
-
additional information
the free FAD acts as a true substrate. In addition to FAD, PheA2 is also active with FMN and riboflavin. The turnover rate of PheA2 with free flavins is strongly dependent on temperature. At 25°C, the activity with FMN and riboflavin is much higher than with FAD, but when the temperature is raised to 53°C, the turnover rates with the different flavins becomes nearly identical. Dichlorophenolindophenol is a poor cofactor
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