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  A conifer UDP-sugar dependent glycosyltransferase contributes to acetophenone metabolism and defense against insects

Mageroy, M. H., Jancsik, S., Yuen, M. M. S., Fischer, M., Withers, S. G., Paetz, C., et al. (2017). A conifer UDP-sugar dependent glycosyltransferase contributes to acetophenone metabolism and defense against insects. Plant Physiology, 175(2), 641-651. doi:10.1104/pp.17.00611.

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http://dx.doi.org/10.1104/pp.17.00611 (Publisher version)
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Mageroy, Melissa H., Author
Jancsik, Sharon, Author
Yuen, Macaire Man Saint, Author
Fischer, Michael, Author
Withers, Stephen G., Author
Paetz, Christian1, Author           
Schneider, Bernd1, Author           
MacKay, John J., Author
Bohlmann, Joerg, Author
Affiliations:
1Research Group Biosynthesis / NMR, MPI for Chemical Ecology, Max Planck Society, ou_421898              

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 Abstract: Acetophenones are phenolic compounds involved in resistance of white spruce (Picea glauca) against spruce budworm (Choristoneura fumiferiana), a major forest pest in North America. The acetophenones pungenol and piceol commonly accumulate in spruce foliage in the form of the corresponding glycosides, pungenin and picein. These glycosides appear to be inactive against the insect, but can be cleaved by a spruce β-glucosidase, PgβGlu1, which releases the active aglycons. The reverse glycosylation reaction was hypothesized to involve a family-1 UDP-sugar dependent glycosyltransferase (UGT) to facilitate acetophenone accumulation in the plant. Metabolite and transcriptome profiling over a developmental time course of white spruce bud burst and shoot growth revealed two UGTs, PgUGT5 and PgUGT5b, which glycosylate pungenol. Recombinant PgUGT5b enzyme produced mostly pungenin, while PgUGT5 produced mostly isopungenin. Both UGTs were also active in vitro on select flavonoids. However, the context of transcript and metabolite accumulation did not support a biological role in flavonoid metabolism but correlated with the formation of pungenin in growing shoots. Transcript levels of PgUGT5b were higher than those of PgUGT5 in needles across different genotypes of white spruce. The results support a role of PgUGT5b in the biosynthesis of the glycosylated acetophenone pungenin in white spruce.

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 Dates: 2017-08-012017-08-082017-10
 Publication Status: Published in print
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 Identifiers: Other: NMR242
DOI: 10.1104/pp.17.00611
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Title: Plant Physiology
  Other : Plant Physiol.
Source Genre: Journal
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Publ. Info: Bethesda, Md. : American Society of Plant Biologists
Pages: - Volume / Issue: 175 (2) Sequence Number: - Start / End Page: 641 - 651 Identifier: ISSN: 0032-0889
CoNE: https://pure.mpg.de/cone/journals/resource/991042744294438