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4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NAD+
4-carboxy-2-hydroxy-cis,cis-muconate + NADH
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+
4-carboxy-2-hydroxy-cis,cis-muconate + NADPH
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+ + H2O
4-carboxy-2-hydroxy-cis,cis-muconate + NADPH + 2 H+
4-carboxy-2-hydroxymuconate semialdehyde + NADP+
2-pyrone-4,6-dicarboxylic acid + NADPH + H2O
4-carboxy-2-hydroxymuconate semialdehyde hemiacetal + NADP+
2-oxo-2H-pyran-4,6-dicarboxylate + NADPH + H+
Substrates: -
Products: -
?
protocatechuate + NADP+ + H2O
2-pyrone-4,6-dicarboxylic acid + NADPH + H+
additional information
?
-
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NAD+

4-carboxy-2-hydroxy-cis,cis-muconate + NADH
-
Substrates: NAD+ is less effective than NADP+
Products: -
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NAD+
4-carboxy-2-hydroxy-cis,cis-muconate + NADH
-
Substrates: -
Products: -
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NAD+
4-carboxy-2-hydroxy-cis,cis-muconate + NADH
-
Substrates: NAD+ is less effective than NADP+
Products: -
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NAD+
4-carboxy-2-hydroxy-cis,cis-muconate + NADH
-
Substrates: -
Products: -
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NAD+
4-carboxy-2-hydroxy-cis,cis-muconate + NADH
-
Substrates: -
Products: -
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+

4-carboxy-2-hydroxy-cis,cis-muconate + NADPH
-
Substrates: -
Products: following intramolecular dehydrogenation to the lactone 2-pyrone-4,6-dicarboxylic acid
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+
4-carboxy-2-hydroxy-cis,cis-muconate + NADPH
-
Substrates: -
Products: it is not clear whether the lactonization occurs enzymatically or nonenzymatically
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+
4-carboxy-2-hydroxy-cis,cis-muconate + NADPH
-
Substrates: or NAD+
Products: -
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+
4-carboxy-2-hydroxy-cis,cis-muconate + NADPH
-
Substrates: NAD+ is less effective than NADP+
Products: -
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+
4-carboxy-2-hydroxy-cis,cis-muconate + NADPH
-
Substrates: NAD+ is less effective than NADP+
Products: -
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+
4-carboxy-2-hydroxy-cis,cis-muconate + NADPH
-
Substrates: -
Products: following intramolecular dehydrogenation to the lactone 2-pyrone-4,6-dicarboxylic acid
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+
4-carboxy-2-hydroxy-cis,cis-muconate + NADPH
-
Substrates: -
Products: following intramolecular dehydrogenation to the lactone 2-pyrone-4,6-dicarboxylic acid
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+ + H2O

4-carboxy-2-hydroxy-cis,cis-muconate + NADPH + 2 H+
-
Substrates: -
Products: -
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+ + H2O
4-carboxy-2-hydroxy-cis,cis-muconate + NADPH + 2 H+
-
Substrates: -
Products: -
?
4-carboxy-2-hydroxymuconate semialdehyde + NADP+

2-pyrone-4,6-dicarboxylic acid + NADPH + H2O
-
Substrates: -
Products: -
?
4-carboxy-2-hydroxymuconate semialdehyde + NADP+
2-pyrone-4,6-dicarboxylic acid + NADPH + H2O
-
Substrates: -
Products: -
?
protocatechuate + NADP+ + H2O

2-pyrone-4,6-dicarboxylic acid + NADPH + H+
-
Substrates: -
Products: -
?
protocatechuate + NADP+ + H2O
2-pyrone-4,6-dicarboxylic acid + NADPH + H+
-
Substrates: -
Products: -
?
additional information

?
-
-
Substrates: not: unsubstituted aliphatic or aromatic aldehydes
Products: -
?
additional information
?
-
-
Substrates: interaction with Blue Dextran-2000 and related dyes
Products: -
?
additional information
?
-
-
Substrates: 2-pyrone-4,6-dicarboxylic acid may be a metabolic intermediate in the bacterial metabolism of protocatechuic acid
Products: -
?
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4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+ + H2O
4-carboxy-2-hydroxy-cis,cis-muconate + NADPH + 2 H+
4-carboxy-2-hydroxymuconate semialdehyde hemiacetal + NADP+
2-oxo-2H-pyran-4,6-dicarboxylate + NADPH + H+
Substrates: -
Products: -
?
additional information
?
-
-
Substrates: 2-pyrone-4,6-dicarboxylic acid may be a metabolic intermediate in the bacterial metabolism of protocatechuic acid
Products: -
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+ + H2O

4-carboxy-2-hydroxy-cis,cis-muconate + NADPH + 2 H+
-
Substrates: -
Products: -
?
4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde + NADP+ + H2O
4-carboxy-2-hydroxy-cis,cis-muconate + NADPH + 2 H+
-
Substrates: -
Products: -
?
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2-pyrone-4,6-dicarboxylic acid
-
non-competitive inhibition with respect to 4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde
5,5'-dithiobis(2-nitrobenzoate)
-
1 h at 0.1 mM inhibits 98% of enzyme activity
Blue dextran
-
competitive inhibitor with respect to NADP+
-
methoxy Reactive Blue 2
-
inhibits the enzyme non-competitively with respect to 4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde and competitively with respect to NADP+
Monoiodoacetic acid
-
weaker inhibitor than p-chloromercuribenzoate or HgCl2
N-ethylmaleimide
-
weaker inhibitor than p-chloromercuribenzoate or HgCl2
NADH
-
competitive inhibition with respect to NAD+, non-competitive inhibition with respect to 4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde
NADPH
-
competitive inhibition with respect to NADP, non-competitive inhibition with respect to 4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde
Reactive blue 2
-
inhibits the enzyme non-competitively with respect to 4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde and competitively with respect to NADP+
Reactive Blue 4
-
inhibits the enzyme non-competitively with respect to 4-carboxy-2-hydroxy-cis,cis-muconate 6-semialdehyde and competitively with respect to NADP+
additional information
-
not: various metal ions, metal chelating reagents, reducing reagents
-
HgCl2

-
-
HgCl2
-
1 h at 0.01 mM inhibits 83% of enzyme activity
p-chloromercuribenzoate

-
-
p-chloromercuribenzoate
-
1 h at 0.01 mM inhibits 78% of enzyme activity
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additional information

in tobacco leaves, transient expression of bacterial feedback-resistant 3-deoxy-D-arabinoheptulosonate 7-phosphate synthase (AroG) and 3-dehydroshikimate dehydratase (QsuB) produces high titers of protocatechuate (PCA), which is in turn efficiently converted into 2-pyrone-4,6-dicarboxylic acid (PDC) upon co-expression of PCA 4,5-dioxygenase (PmdAB) and 4-carboxy-2-hydroxymuconate-6-semialdehyde dehydrogenase (PmdC) derived from Comamonas testosteroni. Stable expression of AroG in Arabidopsis thaliana in a genetic background containing the QsuB gene enhances PCA content in plant biomass, presumably via an increase of the carbon flux through the shikimate pathway. Introducing AroG and the PDC biosynthetic genes (PmdA, PmdB, and PmdC) into the Arabidopsis QsuB background, or introducing the five genes (AroG, QsuB, PmdA, PmdB, and PmdC) stacked on a single construct into wild-type plants, results in PDC titers of about 1% and about 3% dry weight in plant biomass, respectively. Consistent with previous studies of plants expressing QsuB, all PDC producing lines show strong reduction in lignin content in stems. This low lignin trait is accompanied with improvements of biomass saccharification efficiency due to reduced cell wall recalcitrance to enzymatic degradation. Importantly, most transgenic lines show no reduction in biomass yields
additional information
-
in tobacco leaves, transient expression of bacterial feedback-resistant 3-deoxy-D-arabinoheptulosonate 7-phosphate synthase (AroG) and 3-dehydroshikimate dehydratase (QsuB) produces high titers of protocatechuate (PCA), which is in turn efficiently converted into 2-pyrone-4,6-dicarboxylic acid (PDC) upon co-expression of PCA 4,5-dioxygenase (PmdAB) and 4-carboxy-2-hydroxymuconate-6-semialdehyde dehydrogenase (PmdC) derived from Comamonas testosteroni. Stable expression of AroG in Arabidopsis thaliana in a genetic background containing the QsuB gene enhances PCA content in plant biomass, presumably via an increase of the carbon flux through the shikimate pathway. Introducing AroG and the PDC biosynthetic genes (PmdA, PmdB, and PmdC) into the Arabidopsis QsuB background, or introducing the five genes (AroG, QsuB, PmdA, PmdB, and PmdC) stacked on a single construct into wild-type plants, results in PDC titers of about 1% and about 3% dry weight in plant biomass, respectively. Consistent with previous studies of plants expressing QsuB, all PDC producing lines show strong reduction in lignin content in stems. This low lignin trait is accompanied with improvements of biomass saccharification efficiency due to reduced cell wall recalcitrance to enzymatic degradation. Importantly, most transgenic lines show no reduction in biomass yields
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Maruyama, K.
Interaction of 4-carboxy-2-hydroxymuconate-6-semialdehyde dehydrogenase with Reactive Blue 2 and related dyes
J. Biochem.
103
714-721
1988
Phytopseudomonas straminea
brenda
Maruyama, K.
Isolation and identification of the reaction product of alpha-hydroxy-gamma-carboxymuconic epsilon-semialdehyde dehydrogenase
J. Biochem.
86
1671-1677
1979
Phytopseudomonas straminea
brenda
Maruyama, K.; Ariga, N.; Tsuda, M.; Deguchi, K.
Purification and properties of alpha-hydroxy-gamma-carboxymuconic epsilon-semialdehyde dehydrogenase
J. Biochem.
83
1125-1134
1978
Phytopseudomonas straminea
brenda
Masai, E.; Momose, K.; Hara, H.; Nisihikawa, S.; Katayama, Y.; Fukuda, M.
Genetic and biochemical characterization of 4-carboxy-2-hydroxymuconate-6-semialdehyde dehydrogenase and its role in the protocatechuate 4,5-cleavage pathway in Sphingomonas paucimobilis SYK-6
J. Bacteriol.
182
6651-6658
2000
Sphingomonas paucimobilis, Sphingomonas paucimobilis SYK6
brenda
Maruyama, K.; Shibayama, T.; Ichikawa, A.; Sakou, Y.; Yamada, S.; Sugisaki, H.
Cloning and characterization of the genes encoding enzymes for the protocatechuate meta-degradation pathway of Pseudomonas ochraceae NGJ1
Biosci. Biotechnol. Biochem.
68
1434-1441
2004
Phytopseudomonas straminea, Phytopseudomonas straminea NGJ1
brenda
Otsuka, Y.; Nakamura, M.; Shigehara, K.; Sugimura, K.; Masai, E.; Ohara, S.; Katayama, Y.
Efficient production of 2-pyrone 4,6-dicarboxylic acid as a novel polymer-based material from protocatechuate by microbial function
Appl. Microbiol. Biotechnol.
71
608-614
2006
Sphingomonas paucimobilis, Sphingomonas paucimobilis SYK-6
brenda
Lin, C.Y.; Vuu, K.M.; Amer, B.; Shih, P.M.; Baidoo, E.E.K.; Scheller, H.V.; Eudes, A.
In-planta production of the biodegradable polyester precursor 2-pyrone-4,6-dicarboxylic acid (PDC) stacking reduced biomass recalcitrance with value-added co-product
Metab. Eng.
66
148-156
2021
Comamonas testosteroni (Q93PS4), Comamonas testosteroni
brenda