The origin and biosynthesis of the benzenoid moiety of ubiquinone (Coenzyme Q) in Arabidopsis

Anna Block, Joshua R. Widhalm, Abdelhak Fatihi, Rebecca E. Cahoon, Yashitola Wamboldt, Christian Elowsky, Sally Mackenzie, Edgar B Cahoon, Clint Chapple, Natalia Dudareva, Gilles J. Basset

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

It is not known how plants make the benzenoid ring of ubiquinone, a vital respiratory cofactor. Here, we demonstrate that Arabidopsis thaliana uses for that purpose two separate biosynthetic branches stemming from phenylalanine and tyrosine. Gene network modeling and characterization of T-DNA mutants indicated that acyl-activating enzyme encoded by At4g19010 contributes to the biosynthesis of ubiquinone specifically from phenylalanine. CoA ligase assays verified that At4g19010 prefers para-coumarate, ferulate, and caffeate as substrates. Feeding experiments demonstrated that the at4g19010 knockout cannot use para-coumarate for ubiquinone biosynthesis and that the supply of 4-hydroxybenzoate, the side-chain shortened version of para-coumarate, can bypass this blockage. Furthermore, a trans-cinnamate 4-hydroxylase mutant, which is impaired in the conversion of trans-cinnamate into para-coumarate, displayed similar defects in ubiquinone biosynthesis to that of the at4g19010 knockout. Green fluorescent protein fusion experiments demonstrated that At4g19010 occurs in peroxisomes, resulting in an elaborate biosynthetic architecture where phenylpropanoid intermediates have to be transported from the cytosol to peroxisomes and then to mitochondria where ubiquinone is assembled. Collectively, these results demonstrate that At4g19010 activates the propyl side chain of para-coumarate for its subsequent β-oxidative shortening. Evidence is shown that the peroxisomal ABCD transporter (PXA1) plays a critical role in this branch.

Original languageEnglish (US)
Pages (from-to)1938-1948
Number of pages11
JournalPlant Cell
Volume26
Issue number5
DOIs
StatePublished - Jan 1 2014

Fingerprint

Ubiquinone
ubiquinones
Arabidopsis
biosynthesis
Peroxisomes
peroxisomes
Phenylalanine
phenylalanine
Trans-Cinnamate 4-Monooxygenase
Cinnamates
trans-cinnamate 4-monooxygenase
cinnamates
mutants
Gene Regulatory Networks
phenylpropanoids
Coenzyme A
Ligases
Green Fluorescent Proteins
green fluorescent protein
ligases

ASJC Scopus subject areas

  • Plant Science
  • Cell Biology

Cite this

Block, A., Widhalm, J. R., Fatihi, A., Cahoon, R. E., Wamboldt, Y., Elowsky, C., ... Basset, G. J. (2014). The origin and biosynthesis of the benzenoid moiety of ubiquinone (Coenzyme Q) in Arabidopsis. Plant Cell, 26(5), 1938-1948. https://doi.org/10.1105/tpc.114.125807

The origin and biosynthesis of the benzenoid moiety of ubiquinone (Coenzyme Q) in Arabidopsis. / Block, Anna; Widhalm, Joshua R.; Fatihi, Abdelhak; Cahoon, Rebecca E.; Wamboldt, Yashitola; Elowsky, Christian; Mackenzie, Sally; Cahoon, Edgar B; Chapple, Clint; Dudareva, Natalia; Basset, Gilles J.

In: Plant Cell, Vol. 26, No. 5, 01.01.2014, p. 1938-1948.

Research output: Contribution to journalArticle

Block, A, Widhalm, JR, Fatihi, A, Cahoon, RE, Wamboldt, Y, Elowsky, C, Mackenzie, S, Cahoon, EB, Chapple, C, Dudareva, N & Basset, GJ 2014, 'The origin and biosynthesis of the benzenoid moiety of ubiquinone (Coenzyme Q) in Arabidopsis', Plant Cell, vol. 26, no. 5, pp. 1938-1948. https://doi.org/10.1105/tpc.114.125807
Block A, Widhalm JR, Fatihi A, Cahoon RE, Wamboldt Y, Elowsky C et al. The origin and biosynthesis of the benzenoid moiety of ubiquinone (Coenzyme Q) in Arabidopsis. Plant Cell. 2014 Jan 1;26(5):1938-1948. https://doi.org/10.1105/tpc.114.125807
Block, Anna ; Widhalm, Joshua R. ; Fatihi, Abdelhak ; Cahoon, Rebecca E. ; Wamboldt, Yashitola ; Elowsky, Christian ; Mackenzie, Sally ; Cahoon, Edgar B ; Chapple, Clint ; Dudareva, Natalia ; Basset, Gilles J. / The origin and biosynthesis of the benzenoid moiety of ubiquinone (Coenzyme Q) in Arabidopsis. In: Plant Cell. 2014 ; Vol. 26, No. 5. pp. 1938-1948.
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