Enzymes
| UniProtKB help_outline | 1 proteins |
| Enzyme class help_outline |
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Reaction participants Show >> << Hide
- Name help_outline a (3R,4R)-4,2'-dihydroxyisoflavan Identifier CHEBI:140181 Charge 0 Formula C15H4O3R10 SMILEShelp_outline C1(=C(C(=C(C2=C1OC([C@]([C@H]2O)(C3=C(C(=C(C(=C3O)*)*)*)*)*)*)*)*)*)* 2D coordinates Mol file for the small molecule Search links Involved in 3 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline NADP+ Identifier CHEBI:58349 Charge -3 Formula C21H25N7O17P3 InChIKeyhelp_outline XJLXINKUBYWONI-NNYOXOHSSA-K SMILEShelp_outline NC(=O)c1ccc[n+](c1)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](OP([O-])([O-])=O)[C@@H]2O)n2cnc3c(N)ncnc23)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1,253 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline a (3R)-2'-hydroxyisoflavanone Identifier CHEBI:140183 Charge 0 Formula C15H2O3R10 SMILEShelp_outline C1(=C(C(=C(C2=C1OC([C@](C2=O)(C3=C(C(=C(C(=C3O)*)*)*)*)*)*)*)*)*)* 2D coordinates Mol file for the small molecule Search links Involved in 3 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H+ Identifier CHEBI:15378 Charge 1 Formula H InChIKeyhelp_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILEShelp_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,176 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline NADPH Identifier CHEBI:57783 (Beilstein: 10411862) help_outline Charge -4 Formula C21H26N7O17P3 InChIKeyhelp_outline ACFIXJIJDZMPPO-NNYOXOHSSA-J SMILEShelp_outline NC(=O)C1=CN(C=CC1)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](OP([O-])([O-])=O)[C@@H]2O)n2cnc3c(N)ncnc23)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1,247 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:56284 | RHEA:56285 | RHEA:56286 | RHEA:56287 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Related reactions help_outline
Specific form(s) of this reaction
Publications
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Molecular cloning and expression of alfalfa (Medicago sativa L.) vestitone reductase, the penultimate enzyme in medicarpin biosynthesis.
Guo L., Paiva N.L.
Medicarpin, the major phytoalexin in alfalfa, is synthesized by way of the isoflavonoid branch of phenylpropanoid metabolism. One of the final steps of medicarpin biosynthesis, from vestitone to 7,2'-dihydroxy-4'-methoxyisoflavanol, is catalyzed by vestitone reductase. A 1245-bp cDNA clone which e ... >> More
Medicarpin, the major phytoalexin in alfalfa, is synthesized by way of the isoflavonoid branch of phenylpropanoid metabolism. One of the final steps of medicarpin biosynthesis, from vestitone to 7,2'-dihydroxy-4'-methoxyisoflavanol, is catalyzed by vestitone reductase. A 1245-bp cDNA clone which encodes vestitone reductase was identified utilizing internal amino acid sequence of purified vestitone reductase. When expressed in Escherichia coli, the cloned enzyme exhibits strict substrate stereospecificity for (3R)-vestitone, as was observed for vestitone reductase purified from alfalfa. The calculated molecular weight of the protein (35,918) is similar to that of purified vestitone reductase from alfalfa (38 kDa by SDS-PAGE). The levels of vestitone reductase transcript (1.35 kb) greatly increase within 2 h of elicitor addition to alfalfa cell suspension cultures, preceding the rapid increases in vestitione reductase enzyme activity and medicarpin biosynthesis. In healthy alfalfa plants, the highest levels of transcripts were detected in roots and root nodules, consistent with the synthesis of medicarpin and its conjugate in these tissues. The cloning of the vestitone reductase gene provides a specific tool for the study and manipulation of pterocarpan biosynthesis in legumes. << Less
Arch. Biochem. Biophys. 320:353-360(1995) [PubMed] [EuropePMC]
This publication is cited by 2 other entries.
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Crystal structure of vestitone reductase from alfalfa (Medicago sativa L.).
Shao H., Dixon R.A., Wang X.
Isoflavonoids are commonly found in leguminous plants, where they play important roles in plant defense and have significant health benefits for animals and humans. Vestitone reductase catalyzes a stereospecific NADPH-dependent reduction of (3R)-vestitone in the biosynthesis of the antimicrobial i ... >> More
Isoflavonoids are commonly found in leguminous plants, where they play important roles in plant defense and have significant health benefits for animals and humans. Vestitone reductase catalyzes a stereospecific NADPH-dependent reduction of (3R)-vestitone in the biosynthesis of the antimicrobial isoflavonoid phytoalexin medicarpin. The crystal structure of alfalfa (Medicago sativa L.) vestitone reductase has been determined at 1.4 A resolution. The structure contains a classic Rossmann fold domain in the N terminus and a small C-terminal domain. Sequence and structural analysis showed that vestitone reductase is a member of the short-chain dehydrogenase/reductase (SDR) superfamily despite the low levels of sequence identity, and the prominent structural differences from other SDR enzymes with known structures. The putative binding sites for the co-factor NADPH and the substrate (3R)-vestitone were defined and located in a large cleft formed between the N and C-terminal domains of enzyme. Potential key residues for enzyme activity were also identified, including the catalytic triad Ser129-Tyr164-Lys168. A molecular docking study showed that (3R)-vestitone, but not the (3S) isomer, forms favored interactions with the co-factor and catalytic triad, thus providing an explanation for the enzyme's strict substrate stereo-specificity. << Less
J. Mol. Biol. 369:265-276(2007) [PubMed] [EuropePMC]
This publication is cited by 1 other entry.
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The 'pterocarpan synthase' of alfalfa: association and co-induction of vestitone reductase and 7,2'-dihydroxy-4'-methoxy-isoflavanol (DMI) dehydratase, the two final enzymes in medicarpin biosynthesis.
Guo L., Dixon R.A., Paiva N.L.
Vestitone reductase and 7,2'-dihydroxy-4'-methoxy-isoflavanol (DMI) dehydratase are the two final enzymes in medicarpin biosynthesis in alfalfa (Medicago sativa). Although two independent enzymes, vestitone reductase and DMI dehydratase can be loosely associated in low ionic strength buffers, pres ... >> More
Vestitone reductase and 7,2'-dihydroxy-4'-methoxy-isoflavanol (DMI) dehydratase are the two final enzymes in medicarpin biosynthesis in alfalfa (Medicago sativa). Although two independent enzymes, vestitone reductase and DMI dehydratase can be loosely associated in low ionic strength buffers, presumably by a weak protein-protein interaction. The activities of vestitone reductase and DMI dehydratase increased approximately 3-fold 6 hours after elicitor treatment in alfalfa suspension cell culture. The activities remained at maximal levels for 40 hours, correlating with a steady increase in the medicarpin content of the cells. Medicarpin produced in vitro from vestitone by the action of vestitone reductase and DMI dehydratase was found to be (-)-medicarpin (6aR,11aR-medicarpin), possessing the same stereochemistry as medicarpin produced in vivo. << Less
FEBS Lett. 356:221-225(1994) [PubMed] [EuropePMC]
This publication is cited by 6 other entries.
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Conversion of vestitone to medicarpin in alfalfa (Medicago sativa L.) is catalyzed by two independent enzymes. Identification, purification, and characterization of vestitone reductase and 7,2'-dihydroxy-4'-methoxyisoflavanol dehydratase.
Guo L., Dixon R.A., Paiva N.L.
Pterocarpan phytoalexins are antimicrobial compounds in leguminous plants. The final step of pterocarpan biosynthesis, conversion of vestitone to medicarpin, was thought to be catalyzed by a single enzyme "pterocarpan synthase." We have shown that the pterocarpan synthase activity observed in crud ... >> More
Pterocarpan phytoalexins are antimicrobial compounds in leguminous plants. The final step of pterocarpan biosynthesis, conversion of vestitone to medicarpin, was thought to be catalyzed by a single enzyme "pterocarpan synthase." We have shown that the pterocarpan synthase activity observed in crude extracts of alfalfa suspension cell cultures is the sum of two independent enzymatic activities: vestitone reductase, which catalyzes the NADPH-dependent reduction of vestitone to 7,2'-dihydroxy-4'-methoxyisoflavanol (DMI), and DMI dehydratase, which catalyzes loss of water and closure of an ether ring to form medicarpin. The first enzyme, vestitone reductase, was purified 1,840-fold to homogeneity by a 5-step procedure. Purified vestitone reductase showed a single band on SDS-polyacrylamide gel electrophoresis with an estimated molecular mass of 38 kDa. The native molecular mass measured by gel filtration was shown to be 34 kDa, indicating that vestitone reductase is a monomer. Vestitone reductase has strict substrate stereo specificity for (3R)-vestitone with a Km value of 45 microM. The second enzyme, DMI dehydratase, was partially purified 962-fold. DMI dehydratase had a native molecular mass of 38 kDa as estimated by gel filtration and a Km value of 5 microM for DMI. Both enzymes have a temperature optimum of 30 degrees C and a pH optimum of 6.0. The discovery of vestitone reductase and DMI dehydratase will facilitate future genetic manipulation of pterocarpan biosynthesis. << Less
J. Biol. Chem. 269:22372-22378(1994) [PubMed] [EuropePMC]
This publication is cited by 6 other entries.