Linked Life Data

10938360

Source:http://linkedlifedata.com/resource/pubmed/id/10938360

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pubmed-article:10938360pubmed:abstractTextNovel cyanogenic plants have been generated by the simultaneous expression of the two multifunctional sorghum (Sorghum bicolor [L.] Moench) cytochrome P450 enzymes CYP79A1 and CYP71E1 in tobacco (Nicotiana tabacum cv Xanthi) and Arabidopsis under the regulation of the constitutive 35S promoter. CYP79A1 and CYP71E1 catalyze the conversion of the parent amino acid tyrosine to p-hydroxymandelonitrile, the aglycone of the cyanogenic glucoside dhurrin. CYP79A1 catalyzes the conversion of tyrosine to p-hydroxyphenylacetaldoxime and CYP71E1, the subsequent conversion to p-hydroxymandelonitrile. p-Hydroxymandelonitrile is labile and dissociates into p-hydroxybenzaldehyde and hydrogen cyanide, the same products released from dhurrin upon cell disruption as a result of pest or herbivore attack. In transgenic plants expressing CYP79A1 as well as CYP71E1, the activity of CYP79A1 is higher than that of CYP71E1, resulting in the accumulation of several p-hydroxyphenylacetaldoxime-derived products in the addition to those derived from p-hydroxymandelonitrile. Transgenic tobacco and Arabidopsis plants expressing only CYP79A1 accumulate the same p-hydroxyphenylacetaldoxime-derived products as transgenic plants expressing both sorghum cytochrome P450 enzymes. In addition, the transgenic CYP79A1 Arabidopsis plants accumulate large amounts of p-hydroxybenzylglucosinolate. In transgenic Arabidopsis expressing CYP71E1, this enzyme and the enzymes of the pre-existing glucosinolate pathway compete for the p-hydroxyphenylacetaldoxime as substrate, resulting in the formation of small amounts of p-hydroxybenzylglucosinolate. Cyanogenic glucosides are phytoanticipins, and the present study demonstrates the feasibility of expressing cyanogenic compounds in new plant species by gene transfer technology to improve pest and disease resistance.lld:pubmed
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pubmed-article:10938360pubmed:dateRevised2010-9-14lld:pubmed
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pubmed-article:10938360pubmed:articleTitleTransgenic tobacco and Arabidopsis plants expressing the two multifunctional sorghum cytochrome P450 enzymes, CYP79A1 and CYP71E1, are cyanogenic and accumulate metabolites derived from intermediates in Dhurrin biosynthesis.lld:pubmed
pubmed-article:10938360pubmed:affiliationPlant Biochemistry Laboratory, Department of Plant Biology, Royal Veterinary and Agricultural University, DK-1871 Frederiksberg C, Copenhagen, Denmark.lld:pubmed
pubmed-article:10938360pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10938360pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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