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Genetic evidence for the role of isopentenyl diphosphate isomerases in the mevalonate pathway and plant development in Arabidopsis

Okada, K.(Tokyo Univ. (Japan)) ; Kasahara, H ; Yamaguchi, S ; Kawaide, H ; Kamiya, Y ; Nojiri, H ; Yamane, H

Plant and cell physiology, 2008-04, Vol.49 (4), p.604-616 [Periódico revisado por pares]

Japan: Oxford University Press

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Título:
Genetic evidence for the role of isopentenyl diphosphate isomerases in the mevalonate pathway and plant development in Arabidopsis
Autor: Okada, K.(Tokyo Univ. (Japan)) ; Kasahara, H ; Yamaguchi, S ; Kawaide, H ; Kamiya, Y ; Nojiri, H ; Yamane, H
Assuntos: ARABIDOPSIS ; Arabidopsis - enzymology ; Arabidopsis - genetics ; Arabidopsis - growth & development ; BIOCHEMICAL PATHWAYS ; Carbon Isotopes ; Carbon-Carbon Double Bond Isomerases - genetics ; Carbon-Carbon Double Bond Isomerases - metabolism ; CRECIMIENTO ; CROISSANCE ; Dimethylallyl diphosphate ; FENOTIPOS ; Gene Expression Regulation, Enzymologic ; Gene Expression Regulation, Plant ; Genetic Complementation Test ; GROWTH ; IPP isomerase ; ISOMERASAS ; ISOMERASE ; ISOMERASES ; Isopentenyl diphosphate ; ISOPRENOIDE ; ISOPRENOIDES ; ISOPRENOIDS ; MEP pathway ; Mevalonic Acid - analogs & derivatives ; Mevalonic Acid - metabolism ; MUTANT ; MUTANTES ; MUTANTS ; Mutation - genetics ; MVA pathway ; Organ Specificity ; PHENOTYPE ; PHENOTYPES ; Plant Infertility ; Protein Transport ; Subcellular Fractions - enzymology ; Terpenes - metabolism ; TOCOFEROLES ; TOCOPHEROL ; TOCOPHEROLS ; VIA BIOQUIMICA DEL METABOLISMO ; VOIE BIOCHIMIQUE DU METABOLISME ; Xylulose - analogs & derivatives ; Xylulose - metabolism
É parte de: Plant and cell physiology, 2008-04, Vol.49 (4), p.604-616
Notas: 2008006668
F60
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SourceType-Scholarly Journals-1
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Descrição: Isopentenyl/dimethylallyl diphosphate isomerase (IPI) catalyzes the interconversion of isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP), which are the universal C5 units of isoprenoids. In plants, IPP and DMAPP are synthesized via the cytosolic mevalonate (MVA) and plastidic methylerythritol phosphate (MEP) pathways, respectively. However, the role of IPI in each pathway and in plant development is unknown due to a lack of genetic studies using IPI-defective mutants. Here, we show that the atipi1atipi2 double mutant, which is defective in two Arabidopsis IPI isozymes, exhibits dwarfism and male sterility under long-day conditions and decreased pigmentation under continuous light, whereas the atipi1 and atipi2 single mutants are phenotypically normal. We also show that the sterol and ubiquinone levels in the double mutant are <50% of those in wild-type plants, and that the male-sterile phenotype is chemically complemented by squalene, a sterol precursor. In vivo isotope labeling experiments using the atipi1atipi2 double mutant revealed a decrease in the incorporation of MVA (in its lactone form) into sterols, with no decrease in the incorporation of MEP pathway intermediates into tocopherol. These results demonstrate a critical role for IPI in isoprenoid biosynthesis via the MVA pathway, and they imply that IPI is essential for the maintenance of appropriate levels of IPP and DMAPP in different subcellular compartments in plants.
Editor: Japan: Oxford University Press
Idioma: Inglês

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Genetic evidence for the role of isopentenyl diphosphate isomerases in the mevalonate pathway and plant development in Arabidopsis

Okada, K.(Tokyo Univ. (Japan)) ; Kasahara, H ; Yamaguchi, S ; Kawaide, H ; Kamiya, Y ; Nojiri, H ; Yamane, H

Japan: Oxford University Press

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