An Arabidopsis gene induced by wounding functionally homologous to flavoprotein oxidoreductases

An Arabidopsis gene induced by wounding functionally homologous to flavoprotein oxidoreductases The regulation of genes in response to wounding is mediated in part by the octadecanoids 12-oxo-phytodienoic acid (OPDA), jasmonic acid (JA) and its methyl ester methyl jasmonate (MeJA). We identified, by differential display, an Arabidopsis gene (OPR3) induced after wounding. OPR3 is homologous to members of the flavin mononucleotide (FMN) binding proteins, including the old yellow enzyme (OYE) from yeast and 12-oxophytodienoate-10,11-reductase (OPR) from Arabidopsis. Transcripts of OPR3 rapidly accumulated in leaves after wounding and MeJA treatment, but they were detected in various tissues of unwounded plants at relatively low levels. Expression of the OPR3 gene was significantly reduced in wounded leaves of the coi1 mutant, indicating partial dependence on jasmonate perception for full induction of the gene. The recombinant protein of OPR3 cross-reacted with an antiserum raised against the OYE protein, and showed oxidation of β-NADPH when OPDA or 15-deoxy-Δ12,14-prostaglandin J2 (PGJ2), an analogue of OPDA, was used as substrate. β-NADPH oxidation was not observed when MeJA, which lacks the double bond in the ketone ring, was used as substrate. The recombinant OPR3 protein also showed β-NADPH oxidation activity in the presence of cyclohexenone, but not cyclohexanone, suggesting that the enzyme has specificity to cleavage of olefinic bonds in cyclic enones. The results show that the OPR3 gene product represents a new OPR of Arabidopsis induced after wounding. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Molecular Biology Springer Journals

An Arabidopsis gene induced by wounding functionally homologous to flavoprotein oxidoreductases

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Publisher
Kluwer Academic Publishers
Copyright
Copyright © 2000 by Kluwer Academic Publishers
Subject
Life Sciences; Biochemistry, general; Plant Sciences; Plant Pathology
ISSN
0167-4412
eISSN
1573-5028
D.O.I.
10.1023/A:1006464822434
Publisher site
See Article on Publisher Site

Abstract

The regulation of genes in response to wounding is mediated in part by the octadecanoids 12-oxo-phytodienoic acid (OPDA), jasmonic acid (JA) and its methyl ester methyl jasmonate (MeJA). We identified, by differential display, an Arabidopsis gene (OPR3) induced after wounding. OPR3 is homologous to members of the flavin mononucleotide (FMN) binding proteins, including the old yellow enzyme (OYE) from yeast and 12-oxophytodienoate-10,11-reductase (OPR) from Arabidopsis. Transcripts of OPR3 rapidly accumulated in leaves after wounding and MeJA treatment, but they were detected in various tissues of unwounded plants at relatively low levels. Expression of the OPR3 gene was significantly reduced in wounded leaves of the coi1 mutant, indicating partial dependence on jasmonate perception for full induction of the gene. The recombinant protein of OPR3 cross-reacted with an antiserum raised against the OYE protein, and showed oxidation of β-NADPH when OPDA or 15-deoxy-Δ12,14-prostaglandin J2 (PGJ2), an analogue of OPDA, was used as substrate. β-NADPH oxidation was not observed when MeJA, which lacks the double bond in the ketone ring, was used as substrate. The recombinant OPR3 protein also showed β-NADPH oxidation activity in the presence of cyclohexenone, but not cyclohexanone, suggesting that the enzyme has specificity to cleavage of olefinic bonds in cyclic enones. The results show that the OPR3 gene product represents a new OPR of Arabidopsis induced after wounding.

Journal

Plant Molecular BiologySpringer Journals

Published: Oct 16, 2004

References

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