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  Organ-specific distribution and non-enzymatic conversions indicate a metabolic network of phenylphenalenones in Xiphidium caeruleum

Chen, Y., Paetz, C., & Schneider, B. (2019). Organ-specific distribution and non-enzymatic conversions indicate a metabolic network of phenylphenalenones in Xiphidium caeruleum. Phytochemistry, 159, 30-38. doi:10.1016/j.phytochem.2018.12.004.

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 Creators:
Chen, Yu1, Author              
Paetz, Christian1, Author              
Schneider, Bernd1, Author              
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1Research Group Biosynthesis / NMR, MPI for Chemical Ecology, Max Planck Society, ou_421898              

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 Abstract: We investigated the organ-specific phytochemistry of the inflorescences, leaves at different stages of senescence, and roots of Xiphidium caeruleum (Haemodoraceae) and elucidated the structure of six undescribed compounds. Among these, a phenylcarbamoylnaphthoquinone (PCNQ), representing the first member of a class of undescribed phenylphenalenone-derived nitrogenous compounds, was identified and its spontaneous formation elaborated. Starting from phenylbenzoisochromenone glucosides, the reaction cascade proceeds through oxidative decarboxylation and several oxidation steps to an anhydride, which is further converted to a carboxyphenylnaphthoquinone. In the presence of amino acids, this carboxy-phenylnaphthoquinone readily reacts to PCNQs. Hence, the carboxy-phenylnaphthoquinone was hypothesized to be involved in plant defense because of its reactivity towards amino acids. It was also hypothesized that reduced levels of the corresponding glucosidic phenylbenzoisochromenone precursors in older leaves may foster pathogen-driven senescence.

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 Dates: 2018-12-072018-122019
 Publication Status: Published in print
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 Identifiers: Other: NMR258
DOI: 10.1016/j.phytochem.2018.12.004
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Title: Phytochemistry
  Other : Phyto
Source Genre: Journal
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Publ. Info: Oxford : Pergamon
Pages: - Volume / Issue: 159 Sequence Number: - Start / End Page: 30 - 38 Identifier: ISSN: 0031-9422
CoNE: https://pure.mpg.de/cone/journals/resource/954925433416