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  • 1
    Publication Date: 2012-08-28
    Description: Plants possess arrays of functionally diverse specialized metabolites, many of which are distributed taxonomically. Here, we describe the evolution of a class of substituted alpha-pyrone metabolites in Arabidopsis, which we have named arabidopyrones. The biosynthesis of arabidopyrones requires a cytochrome P450 enzyme (CYP84A4) to generate the catechol-substituted substrate for an extradiol ring-cleavage dioxygenase (AtLigB). Unlike other ring-cleavage-derived plant metabolites made from tyrosine, arabidopyrones are instead derived from phenylalanine through the early steps of phenylpropanoid metabolism. Whereas CYP84A4, an Arabidopsis-specific paralog of the lignin-biosynthetic enzyme CYP84A1, has neofunctionalized relative to its ancestor, AtLigB homologs are widespread among land plants and many bacteria. This study exemplifies the rapid evolution of a biochemical pathway formed by the addition of a new biological activity into an existing metabolic infrastructure.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weng, Jing-Ke -- Li, Yi -- Mo, Huaping -- Chapple, Clint -- New York, N.Y. -- Science. 2012 Aug 24;337(6097):960-4. doi: 10.1126/science.1221614.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Purdue University, West Lafayette, IN 47907, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Arabidopsis/enzymology/genetics/*metabolism ; Arabidopsis Proteins/chemistry/genetics/*metabolism ; Base Sequence ; Biosynthetic Pathways ; Catalytic Domain ; Cytochrome P-450 Enzyme System/chemistry/genetics/*metabolism ; Dioxygenases/genetics/metabolism ; Evolution, Molecular ; Gene Duplication ; Genome, Plant ; Models, Molecular ; Molecular Sequence Data ; Mutation ; Phenylalanine/metabolism ; Phylogeny ; Plant Stems/metabolism ; Plants, Genetically Modified ; Pyrones/chemistry/*metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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