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3-dehydroquinate + NADH
quinate + NAD+
L-quinate + NAD+
3-dehydroquinate + NADH + H+
L-quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
r
L-quinate + NADP+
3-dehydroquinate + NADPH + H+
Substrates: low activity
Products: -
r
p-hydroxybenzoate + O2
protocatechuic acid + H2O
quinate + NAD+
5-dehydroquinate + NADH + H+
quinic acid + NAD(P)+
dehydroquinic acid + NAD(P)H + H+
shikimate + NAD+
3-dehydroshikimate + NADH + H+
shikimate + NAD+
5-dehydroshikimate + NADH + H+
-
Substrates: -
Products: -
r
additional information
?
-
3-dehydroquinate + NADH

quinate + NAD+
-
Substrates: -
Products: -
r
3-dehydroquinate + NADH
quinate + NAD+
-
Substrates: -
Products: -
r
L-quinate + NAD+

3-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
r
L-quinate + NAD+
3-dehydroquinate + NADH + H+
-
Substrates: QDH plays a key role in the quinate-degradation pathway
Products: -
r
L-quinate + NAD+
3-dehydroquinate + NADH + H+
-
Substrates: Thr88 and Thr221 are involved in quinate binding
Products: -
r
L-quinate + NAD+
3-dehydroquinate + NADH + H+
Substrates: the enzyme is involved in the catabolic quinate metabolism required for the degradation of lignin
Products: -
r
L-quinate + NAD+
3-dehydroquinate + NADH + H+
Substrates: the enzyme also shows activity with shikimate. Clear substrate preference of the enzyme for quinate compared with shikimate both at the pH optimum and in a physiological pH range. The enzyme is strictly NAD(H) dependent
Products: -
r
L-quinate + NAD+
3-dehydroquinate + NADH + H+
Substrates: the enzyme is involved in the catabolic quinate metabolism required for the degradation of lignin
Products: -
r
L-quinate + NAD+
3-dehydroquinate + NADH + H+
Substrates: the enzyme also shows activity with shikimate. Clear substrate preference of the enzyme for quinate compared with shikimate both at the pH optimum and in a physiological pH range. The enzyme is strictly NAD(H) dependent
Products: -
r
L-quinate + NAD+
3-dehydroquinate + NADH + H+
Substrates: -
Products: -
r
L-quinate + NAD+
3-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
r
p-hydroxybenzoate + O2

protocatechuic acid + H2O
-
Substrates: overview substrate specificity, some strains are using the substrate, some are not
Products: -
?
p-hydroxybenzoate + O2
protocatechuic acid + H2O
-
Substrates: overview substrate specificity, some strains are using the substrate, some are not
Products: -
?
quinate + NAD+

5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
?
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
?, r
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
r
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
?
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
?
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: first reaction in inducible quinic acid catabolic pathway
Products: -
?
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
?
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
?
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: overview substrate specificity, some strains are using the substrate, some are not
Products: -
?
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
?
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
r
quinic acid + NAD(P)+

dehydroquinic acid + NAD(P)H + H+
-
Substrates: -
Products: -
r
quinic acid + NAD(P)+
dehydroquinic acid + NAD(P)H + H+
-
Substrates: -
Products: -
r
quinic acid + NAD(P)+
dehydroquinic acid + NAD(P)H + H+
-
Substrates: -
Products: -
r
quinic acid + NAD(P)+
dehydroquinic acid + NAD(P)H + H+
-
Substrates: -
Products: -
?
quinic acid + NAD(P)+
dehydroquinic acid + NAD(P)H + H+
-
Substrates: -
Products: -
?
shikimate + NAD+

3-dehydroshikimate + NADH + H+
-
Substrates: -
Products: -
r
shikimate + NAD+
3-dehydroshikimate + NADH + H+
-
Substrates: -
Products: -
r
shikimate + NAD+
3-dehydroshikimate + NADH + H+
Substrates: the enzyme also shows high activity with quinate. Clear substrate preference of the enzyme for quinate compared with shikimate both at the pH optimum and in a physiological pH range. The enzyme is strictly NAD(H) dependent
Products: -
r
shikimate + NAD+
3-dehydroshikimate + NADH + H+
Substrates: the enzyme also shows high activity with quinate. Clear substrate preference of the enzyme for quinate compared with shikimate both at the pH optimum and in a physiological pH range. The enzyme is strictly NAD(H) dependent
Products: -
r
shikimate + NAD+

?
-
Substrates: -
Products: -
?
shikimate + NAD+
?
-
Substrates: -
Products: -
?
additional information

?
-
-
Substrates: addition of either shikimate or quinate to the assay does not increase the reaction rate when the other substrate is present alone
Products: -
?
additional information
?
-
-
Substrates: the enzyme is involved in the quinate and shikimate metabolism, regulation, overview
Products: -
?
additional information
?
-
-
Substrates: the bifunctional enzyme shows quinate and shikimate dehydrogenase activities
Products: -
?
additional information
?
-
-
Substrates: the bifunctional enzyme shows quinate and shikimate dehydrogenase activities, interconversion of 5-dehydroquinate and 5-dehydroshikimate by dehydroquinase, EC 4.2.1.10, favouring 5-dehydroshikimate formation
Products: -
?
additional information
?
-
-
Substrates: structure of the potential binding site of quinate and shikimate includign the the completely conserved residues Lys92 and Asp102, overview. The crystal structure reveals that in contrast to shikimate, quinate forms a hydrogen bond to the NAD+. In addition, the hydroxyl group of a conserved active-site threonine hydrogen binds to quinate more effectively than to shikimate. Also, the hydroxyl group of a conserved tyrosine approaches the carboxylate group of quinate more closely than it does the carboxylate group of shikimate, active site structure, overview
Products: -
?
additional information
?
-
Substrates: product analysis by GC-MS
Products: -
?
additional information
?
-
Substrates: product analysis by GC-MS
Products: -
?
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3-dehydroquinate + NADH
quinate + NAD+
L-quinate + NAD+
3-dehydroquinate + NADH + H+
L-quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
r
p-hydroxybenzoate + O2
protocatechuic acid + H2O
quinate + NAD+
5-dehydroquinate + NADH + H+
quinic acid + NAD(P)+
dehydroquinic acid + NAD(P)H + H+
shikimate + NAD+
3-dehydroshikimate + NADH + H+
shikimate + NAD+
5-dehydroshikimate + NADH + H+
-
Substrates: -
Products: -
r
additional information
?
-
3-dehydroquinate + NADH

quinate + NAD+
-
Substrates: -
Products: -
r
3-dehydroquinate + NADH
quinate + NAD+
-
Substrates: -
Products: -
r
L-quinate + NAD+

3-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
r
L-quinate + NAD+
3-dehydroquinate + NADH + H+
-
Substrates: QDH plays a key role in the quinate-degradation pathway
Products: -
r
L-quinate + NAD+
3-dehydroquinate + NADH + H+
Substrates: the enzyme is involved in the catabolic quinate metabolism required for the degradation of lignin
Products: -
r
L-quinate + NAD+
3-dehydroquinate + NADH + H+
Substrates: the enzyme is involved in the catabolic quinate metabolism required for the degradation of lignin
Products: -
r
L-quinate + NAD+
3-dehydroquinate + NADH + H+
Substrates: -
Products: -
r
L-quinate + NAD+
3-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
r
p-hydroxybenzoate + O2

protocatechuic acid + H2O
-
Substrates: overview substrate specificity, some strains are using the substrate, some are not
Products: -
?
p-hydroxybenzoate + O2
protocatechuic acid + H2O
-
Substrates: overview substrate specificity, some strains are using the substrate, some are not
Products: -
?
quinate + NAD+

5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
r
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: first reaction in inducible quinic acid catabolic pathway
Products: -
?
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
?
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
?
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
?
quinate + NAD+
5-dehydroquinate + NADH + H+
-
Substrates: -
Products: -
r
quinic acid + NAD(P)+

dehydroquinic acid + NAD(P)H + H+
-
Substrates: -
Products: -
r
quinic acid + NAD(P)+
dehydroquinic acid + NAD(P)H + H+
-
Substrates: -
Products: -
r
quinic acid + NAD(P)+
dehydroquinic acid + NAD(P)H + H+
-
Substrates: -
Products: -
r
shikimate + NAD+

3-dehydroshikimate + NADH + H+
-
Substrates: -
Products: -
r
shikimate + NAD+
3-dehydroshikimate + NADH + H+
-
Substrates: -
Products: -
r
additional information

?
-
-
Substrates: addition of either shikimate or quinate to the assay does not increase the reaction rate when the other substrate is present alone
Products: -
?
additional information
?
-
-
Substrates: the enzyme is involved in the quinate and shikimate metabolism, regulation, overview
Products: -
?
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metabolism
-
link between reactions catalysed by the shikimate pathway enzyme dehydroquinate dehydratase (DQD)/shikimate dehydrogenase (SDH) and quinate dehydrogenase (QDH) involved in quinate metabolism. Shikimate is produced from dehydroquinate via a two-step reaction and subsequently channelled to downstream reactions in the pathway. Quinate is reversibly formed from a side branch of the shikimate pathway from dehydroquinate and may be converted to more structurally complex secondary metabolites or to dehydroquinate to fuel the shikimate pathway
evolution

plant SDH enzymes are fused to dehydroquinate dehydratases (DQDs, EC 4.2.1.10) to form bifunctional DQD/SDH enzymes. The DQD activity is observed for EcDQD/SDH1, 2, and 3, but not for EcDQD/SDH4a. Among the active enzymes, EcDQD/SDH1 exhibits the highest DQD activity, followed by EcDQD/SDH2 (about 50% of the EcDQD/SDH1 activity) and EcDQD/SDH3 (about 5% of the EcDQD/SDH1 activity). For shikimate formation from 3-DHS as well as shikimate oxidation to 3-DHS, measurable catalytic activities are detected for EcDQD/SDH1-3, but the activities of EcDQD/SDH2 and 3 are less than 20% of those of EcDQD/SDH1. Regarding the cofactor, EcDQD/SDH1-3 have a clear preference for NADPH/NADP+ over NADH/ NAD+. In contrast, EcDQD/SDH4a and b lack shikimate formation activity. For the reverse reaction, the conversion of shikimate to 3-DHS, EcDQD/SDH4a and b display low enzymatic activity with a preference for NAD+ as the cofactor. Both EcDQD/SDH2 and 3 exhibit relatively high gallate formation activity, in contrast to the low activity of EcDQD/SDH1. The preferred cofactor in this reaction is NADP+. The reversible quinate formation from 3-DHQ is catalyzed only by EcDQD/SDH4a/b, with NADH/NAD+ as the preferred cofactor. The reaction specificity of EcDQD/SDH4a confirms the sequence-based prediction that EcDQD/SDH4a is a functional QDH enzyme. This enzyme should be renamed EcQDHa and its closest relative, EcDQD/SDH4b, should be renamed EcQDHb. The EcDQD/SDH4a and EcDQD/SDH4b genes may represent allelic variants encoding enzymes with 99.2% amino acid identity
evolution
-
the enzyme belongs to the QDH family, phylogenetic reconstruction of the SDH/QDH gene family across land plants, overview. SDH and QDH belong to the same gene family, which diverged into two phylogenetic clades after a defining gene duplication just prior to the angiosperm/gymnosperm split. Non-seed plants that diverged before this duplication harbour only a single gene of this family. Extant representatives from the chlorophytes (Chlamydomonas reinhardtii), bryophytes (Physcomitrella patens) and lycophytes (Selaginella moellendorfii) encoded almost exclusively SDH activity in vitro. A reconstructed ancestral sequence representing the node just prior to the gene duplication also encoded SDH activity. Quinate dehydrogenase activity was gained only in seed plants following gene duplication. Quinate dehydrogenases of gymnosperms, e.g. Pinus taeda, may be reminiscent of an evolutionary intermediate since they encode equal SDH and QDH activities. The second copy in Pinus taeda maintains specificity for shikimate similar to the activity found in the angiosperm SDH sister clade. The codon for a tyrosine residue within the active site displays a signature of positive selection at the node defining the QDH clade, where it changed to a glycine. Replacing the tyrosine with a glycine in a highly shikimate-specific angiosperm SDH is sufficient to gain some QDH function. Thus, very few mutations are necessary to facilitate the evolution of QDH genes. The two proteins from Pinus taeda are chosen to represent the post-duplication SDH and QDH clades from gymnosperms. The single-copy genes from Selaginella moellendorffii, Physcomitrella patens and Chlamydomonas reinhardtii are selected to represent the pre-duplication lycopod, bryophyte and green algal clades, respectively. Thr381 is conserved in most members across all SDH clades but was replaced under positive selection by Gly in the branch leading into the seed plant QDH clade
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Hawkins, A.R.; Moore, J.D.; Adeokun, A.M.
Characterization of the 3-dehydroquinase domain of the pentafunctional AROM protein, and the quinate dehydrogenase from Aspergillus nidulans, and the overproduction of the type II 3-dehydroquinase from Neurospora crassa
Biochem. J.
296
451-457
1993
Aspergillus nidulans
brenda
Barea, J.L.; Giles, N.H.
Purification and characterization of quinate (shikimate) dehydrogenase, an enzyme in the inducible quinic acid catabolic pathway of Neurospora crassa
Biochim. Biophys. Acta
524
1-14
1978
Neurospora crassa
brenda
Cain, R.B.
The identity of shikimate dehydrogenase and quinate dehydrogenase in Aspergillus niger
Biochem. J.
127
15P
1972
Aspergillus niger
brenda
Gamborg, O.L.
Aromatic metabolism in plants III. Quinate dehydrogenase from mung bean cell suspension cultures
Biochim. Biophys. Acta
128
483-491
1966
Vigna radiata var. radiata
-
brenda
Graziana, A.; Ranjeva, R.; Salimath, B.P.; Boudet, A.M.
The reversible association of quinate:NAD+ oxidoreductase from carrot cells with a putative regulatory subunit depends on light conditions
FEBS Lett.
163
306-311
1983
Daucus carota
-
brenda
Davies, B.D.; Gilvarg, C.; Mitsuhyshi, S.
Enzymes of aromatic biosynthesis C. quinic dehydrogenase from Aerobacter aerogenes
Methods Enzymol.
2
307-311
1955
Klebsiella aerogenes
-
brenda
Kang, X.; Neuhaus, E.; Scheibe, R.
Subcellular localization of quinate: oxidoreductase from Phaseolus mungo L. sprouts
Z. Naturforsch. C
49
415-420
1994
Vigna radiata var. radiata
-
brenda
Grund, E.; Kutzner, H.J.
Utilization of quinate and p-hydroxybenzoate by actinomycetes: key enzymes and taxonomic relevance
J. Basic Microbiol.
38
241-255
1998
Streptomyces sp., Pseudonocardia sp., Rhodococcus rhodochrous
brenda
Ossipov, V.; Bonner, C.; Ossipova, S.; Jensen, R.
Broad-specificity quinate (shikimate) dehydrogenase from Pinus taeda needles
Plant Physiol.
38
923-928
2000
Daucus carota, Pinus taeda
-
brenda
Kang, X.; Scheibe, R.
Purification and characterization of the quinate: oxidoreductase from Phaseolus mungo sprouts
Phytochemistry
33
769-773
1993
Vigna radiata var. radiata
-
brenda
Shein, I.V.; Shibistova, O.B.; Zrazhevskaya, G.K.; Astrakhantseva, N.G.; Polyakova, G.G.
The content of phenolic compounds and the activity of key enzymes of their synthesis in Scots pine hypocotyls infected with Fusarium
Russ. J. Plant Physiol.
50
516-521
2003
Pinus sylvestris
-
brenda
Schoepe, J.; Niefind, K.; Schomburg, D.
1.6 A structure of an NAD(+)-dependent quinate dehydrogenase from Corynebacterium glutamicum
Acta Crystallogr. Sect. D
64
803-809
2008
Corynebacterium glutamicum
brenda
Cain, R.B.
Metabolism of shikimate and quinate by Aspergillus niger and its regulation
Biochem. J.
127
15P-16P
1972
Aspergillus niger
brenda
Marsh, K.; Boldingh, H.; Shilton, R.; Laing, W.
Changes in quinic acid metabolism during fruit development in three kiwifruit species
Funct. Plant Biol.
36
463-470
2009
Actinidia arguta, Actinidia arguta var. arguta, Actinidia chinensis, Actinidia deliciosa, Actinidia deliciosa var. deliciosa
-
brenda
Hppner, A.; Schomburg, D.; Niefind, K.
Enzyme-substrate complexes of the quinate/shikimate dehydrogenase from Corynebacterium glutamicum enable new insights in substrate and cofactor binding, specificity, and discrimination
Biol. Chem.
394
1505-1516
2013
Corynebacterium glutamicum (Q9X5C9), Corynebacterium glutamicum, Corynebacterium glutamicum ATCC 13032 (Q9X5C9)
brenda
Carrington, Y.; Guo, J.; Le, C.H.; Fillo, A.; Kwon, J.; Tran, L.T.; Ehlting, J.
Evolution of a secondary metabolic pathway from primary metabolism shikimate and quinate biosynthesis in plants
Plant J.
95
823-833
2018
Populus trichocarpa
brenda
Tahara, K.; Nishiguchi, M.; Funke, E.; Miyazawa, S.I.; Miyama, T.; Milkowski, C.
Dehydroquinate dehydratase/shikimate dehydrogenases involved in gallate biosynthesis of the aluminum-tolerant tree species Eucalyptus camaldulensis
Planta
253
3
2020
Eucalyptus camaldulensis (A0A5H2WXM2), Eucalyptus camaldulensis (A0A5H2X0F8)
brenda