Cloned (Comment) | Organism |
---|---|
recombinant His6-tagged DQD/SDH isozyme 1 overexpression in Escherichia coli strain M15 | Populus trichocarpa |
recombinant His6-tagged DQD/SDH isozyme 5 overexpression in Escherichia coli strain M15 | Populus trichocarpa |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | Michaelis-Menten kinetics | Populus trichocarpa | |
0.223 | - |
shikimate | with NADP+, pH 8.5, 22°C, recombinant His-tagged Poptr1 | Populus trichocarpa | |
0.321 | - |
shikimate | with NADP+, pH 8.5, 22°C, recombinant His-tagged Poptr1 | Populus trichocarpa | |
0.346 | - |
shikimate | with NAD+, pH 8.5, 22°C, recombinant His-tagged Poptr1 | Populus trichocarpa | |
0.427 | - |
shikimate | with NAD+, pH 8.5, 22°C, recombinant His-tagged Poptr1 | Populus trichocarpa |
Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|
chloroplast | - |
Populus trichocarpa | 9507 | - |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
3-dehydroquinate | Populus trichocarpa | - |
3-dehydroshikimate + H2O | - |
r | |
3-dehydroquinate | Populus trichocarpa Nisqually-1 | - |
3-dehydroshikimate + H2O | - |
r | |
3-dehydroshikimate + NADPH | Populus trichocarpa | - |
shikimate + NADP+ | - |
r | |
additional information | Populus trichocarpa | the bifunctional enzyme dehydroquinate dehydratase/shikimate dehydrogenase (DQD/SDH cf. EC 4.2.1.10 and EC 1.1.1.25) catalyzes the the conversion of 3-dehydroquinate to shikimate via 3-dehydroshikimate | ? | - |
? | |
additional information | Populus trichocarpa | the bifunctional enzyme dehydroquinate dehydratase/shikimate dehydrogenase (DQD3/SDH cf. EC 4.2.1.10 and EC 1.1.1.25) catalyzes the the conversion of 3-dehydroquinate to shikimate via 3-dehydroshikimate | ? | - |
? | |
additional information | Populus trichocarpa Nisqually-1 | the bifunctional enzyme dehydroquinate dehydratase/shikimate dehydrogenase (DQD/SDH cf. EC 4.2.1.10 and EC 1.1.1.25) catalyzes the the conversion of 3-dehydroquinate to shikimate via 3-dehydroshikimate | ? | - |
? | |
additional information | Populus trichocarpa Nisqually-1 | the bifunctional enzyme dehydroquinate dehydratase/shikimate dehydrogenase (DQD3/SDH cf. EC 4.2.1.10 and EC 1.1.1.25) catalyzes the the conversion of 3-dehydroquinate to shikimate via 3-dehydroshikimate | ? | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Populus trichocarpa | - |
trees grown in a field at the University of Victoria, Victoria, British Columbia, Canada | - |
Populus trichocarpa Nisqually-1 | - |
trees grown in a field at the University of Victoria, Victoria, British Columbia, Canada | - |
Purification (Comment) | Organism |
---|---|
recombinant His6-tagged DQD/SDH isozyme 5 from Escherichia coli strain M15 by nickel affinity chromatography | Populus trichocarpa |
Source Tissue | Comment | Organism | Textmining |
---|---|---|---|
bark | - |
Populus trichocarpa | - |
leaf | - |
Populus trichocarpa | - |
additional information | poplar DQD/SDHs have distinct expression profiles, organ-specific expression of poplar DQD/SDHs, overview | Populus trichocarpa | - |
phloem | - |
Populus trichocarpa | - |
xylem | - |
Populus trichocarpa | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
3-dehydroquinate | - |
Populus trichocarpa | 3-dehydroshikimate + H2O | - |
r | |
3-dehydroquinate | DQD reaction | Populus trichocarpa | 3-dehydroshikimate + H2O | - |
r | |
3-dehydroquinate | - |
Populus trichocarpa Nisqually-1 | 3-dehydroshikimate + H2O | - |
r | |
3-dehydroshikimate + NADH | SDH reaction, very low activity with NAD+ | Populus trichocarpa | shikimate + NAD+ | - |
r | |
3-dehydroshikimate + NADPH | - |
Populus trichocarpa | shikimate + NADP+ | - |
r | |
3-dehydroshikimate + NADPH | SDH reaction | Populus trichocarpa | shikimate + NADP+ | - |
r | |
additional information | the bifunctional enzyme dehydroquinate dehydratase/shikimate dehydrogenase (DQD/SDH cf. EC 4.2.1.10 and EC 1.1.1.25) catalyzes the the conversion of 3-dehydroquinate to shikimate via 3-dehydroshikimate | Populus trichocarpa | ? | - |
? | |
additional information | the bifunctional enzyme dehydroquinate dehydratase/shikimate dehydrogenase (DQD3/SDH cf. EC 4.2.1.10 and EC 1.1.1.25) catalyzes the the conversion of 3-dehydroquinate to shikimate via 3-dehydroshikimate | Populus trichocarpa | ? | - |
? | |
additional information | The bifunctional enzyme also catalyzes dehydration of 3-dehydroquinate to 3-dehydroshikimate. Under saturating conditions, Poptr5 displays strong activity with shikimate but no detectable activity with quinate even at elevated enzyme concentrations. The isozyme shows no quinate hydrolyase activity | Populus trichocarpa | ? | - |
? | |
additional information | under saturating conditions, Poptr1 displays strong activity with shikimate but no detectable activity with quinate even at elevated enzyme concentrations. The isozyme shows no quinate hydrolyase activity | Populus trichocarpa | ? | - |
? | |
additional information | the bifunctional enzyme dehydroquinate dehydratase/shikimate dehydrogenase (DQD/SDH cf. EC 4.2.1.10 and EC 1.1.1.25) catalyzes the the conversion of 3-dehydroquinate to shikimate via 3-dehydroshikimate | Populus trichocarpa Nisqually-1 | ? | - |
? | |
additional information | the bifunctional enzyme dehydroquinate dehydratase/shikimate dehydrogenase (DQD3/SDH cf. EC 4.2.1.10 and EC 1.1.1.25) catalyzes the the conversion of 3-dehydroquinate to shikimate via 3-dehydroshikimate | Populus trichocarpa Nisqually-1 | ? | - |
? | |
additional information | The bifunctional enzyme also catalyzes dehydration of 3-dehydroquinate to 3-dehydroshikimate. Under saturating conditions, Poptr5 displays strong activity with shikimate but no detectable activity with quinate even at elevated enzyme concentrations. The isozyme shows no quinate hydrolyase activity | Populus trichocarpa Nisqually-1 | ? | - |
? | |
additional information | under saturating conditions, Poptr1 displays strong activity with shikimate but no detectable activity with quinate even at elevated enzyme concentrations. The isozyme shows no quinate hydrolyase activity | Populus trichocarpa Nisqually-1 | ? | - |
? | |
shikimate + NADP+ | SDH reaction | Populus trichocarpa | 3-dehydroshikimate + NADPH | - |
r |
Subunits | Comment | Organism |
---|---|---|
More | the DQD domain constitutes the N-terminal half of the protein and the SDH domain the C-terminal half. Three-dimensional protein structures homology modelling of the five putative poplar DQD/SDHs using Arabidopsis DQD/SDH enzyme structure, PDB ID c2o7qA, of the enzyme coupled with either 3-dehydroshikimate and tartrate or shikimate, as a template | Populus trichocarpa |
More | three-dimensional protein structures homology modelling of the five putative poplar DQD/SDHs using Arabidopsis DQD/SDH enzyme structure, PDB ID c2o7qA, of the enzyme coupled with either 3-dehydroshikimate and tartrate or shikimate, as a template | Populus trichocarpa |
Synonyms | Comment | Organism |
---|---|---|
dehydroquinate dehydratase/shikimate dehydrogenase | - |
Populus trichocarpa |
DQD/SDH | - |
Populus trichocarpa |
Poptr1 | - |
Populus trichocarpa |
Poptr5 | - |
Populus trichocarpa |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
22 | - |
assay at room temperature | Populus trichocarpa |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
8.5 | - |
assay at | Populus trichocarpa |
Cofactor | Comment | Organism | Structure |
---|---|---|---|
additional information | for Poptr5, no activity with shikimate is detectable in the presence of NAD+ even with elevated enzyme concentrations | Populus trichocarpa | |
additional information | the highest enzyme activity is observed with NADP+, and activity drops by 96% when replacing NADP+ with NAD+ for Poptr1 | Populus trichocarpa | |
NAD+ | very low activity | Populus trichocarpa | |
NADH | very low activity | Populus trichocarpa | |
NADP+ | - |
Populus trichocarpa | |
NADPH | - |
Populus trichocarpa |
General Information | Comment | Organism |
---|---|---|
evolution | members of the same gene family encode enzymes with either shikimate or quinate dehydrogenase activity. The poplar genome encodes five DQD/SDH-like genes (Poptr1 to Poptr5), which have diverged into two distinct groups based on sequence analysis and protein structure prediction. In vitro biochemical assays prove that Poptr1 and -5 are true DQD/SDHs, whereas Poptr2 and -3 instead have QDH activity with only residual DQD/SDH activity, cf. EC 1.1.1.282 | Populus trichocarpa |
metabolism | the shikimate pathway leads to the biosynthesis of aromatic amino acids essential for protein biosynthesis and the production of a wide array of plant secondary metabolites. 3-Dehydroquinate is the substrate for shikimate biosynthesis through the sequential actions of dehydroquinate dehydratase (DQD) and shikimate dehydrogenase (SDH) contained in a single protein in plants. Reactions comprising the shikimate/quinate cycle, overview | Populus trichocarpa |
additional information | three-dimensional protein structures homology modelling of the five putative poplar DQD/SDHs using Arabidopsis DQD/SDH enzyme structure, PDB ID c2o7qA, of the enzyme coupled with either 3-dehydroshikimate and tartrate or shikimate, as a template | Populus trichocarpa |
physiological function | the conversion of 3-dehydroquinate to shikimate via 3-dehydroshikimate is catalyzed by the bifunctional enzyme dehydroquinate dehydratase/shikimate dehydrogenase (DQD/SDH, EC 4.2.1.10 and E.C. 1.1.1.25). The DQD domain constitutes the N-terminal half of the protein and the SDH domain the C-terminal half. Poplar DQD/SDHs have distinct expression profiles suggesting separate roles in protein and lignin biosynthesis. Shikimate is essential for protein biosynthesis | Populus trichocarpa |
physiological function | the conversion of 3-dehydroquinate to shikimate via 3-dehydroshikimate is catalyzed by the bifunctional enzyme dehydroquinate dehydratase/shikimate dehydrogenase (DQD/SDH, EC 4.2.1.10 and EC 1.1.1.25). The DQD domain constitutes the N-terminal half of the protein and the SDH domain the C-terminal half. Poplar DQD/SDHs have distinct expression profiles suggesting separate roles in protein and lignin biosynthesis. Shikimate is essential for protein biosynthesis | Populus trichocarpa |