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  1. IPB Halle
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    • Trenner 0
    • Molecular Signal Processing
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Corrêa dos Santos, C. H.; Geraldo de Carvalho, M.; Franke, K.; Wessjohann, L.; Dammarane-type triterpenoids from the stem of Ziziphus glaziovii Warm. (Rhamnaceae) Phytochemistry 162 250-259 (2019) DOI: 10.1016/j.phytochem.2019.03.010
  • Abstract
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  • RIS

Seven undescribed dammarane-type triterpenoids, together with ten known compounds, were isolated from the stems of Ziziphus glaziovii Warm (= Sarcomphalus glaziovii (Warm.) Hauenschild). The structures were fully assigned by means of uni- and bidimensional NMR and HR-ESI-MS experiments. Extract, fractions and also isolated compounds were evaluated for their antibacterial (against Bacillus subtilis and Aliivibrio fischeri), cytotoxic (against PC-3 and HT-29 human cancer cell lines), anthelmintic (against Caenorhabditis elegans) and antifungal (against Septoria triciti, Botrytis cinerea and Phytopthoria infestans) activities. The methanolic crude extract exhibited substantial antibacterial and cytotoxic activity. The known triterpenes epigouanic acid and alphitolic acid were the most active compounds against B. subtilis, with IC50 of 12 and 22 μM, respectively. The isolated compounds presented up to a concentration of 10 μM none or only weak effects in the cytotoxicity assays. No anthelminthic and antifungal activities were observed.

Publications

Lam, Y. T. H.; Palfner, G.; Lima, C.; Porzel, A.; Brandt, W.; Frolov, A.; Sultani, H.; Franke, K.; Wagner, C.; Merzweiler, K.; Wessjohann, L. A.; Arnold, N.; Nor-guanacastepene pigments from the Chilean mushroom Cortinarius pyromyxa Phytochemistry 165 112048 (2019) DOI: 10.1016/j.phytochem.2019.05.021
  • Abstract
  • BibText
  • RIS

For the first time, the pigment composition of basidiocarps from the Chilean mushroom Cortinarius pyromyxa was studied under various aspects like phylogeny, chemistry and antibiotic activity. A molecular biological study supports the monotypic position of C. pyromyxa in subgenus Myxacium, genus Cortinarius. Four undescribed diterpenoids, named pyromyxones A-D, were isolated from fruiting bodies of C. pyromyxa. Their chemical structures were elucidated based on comprehensive one- and two-dimensional NMR spectroscopic analysis, ESI-HRMS measurements, as well as X-ray crystallography. In addition, the absolute configurations of pyromyxones A-D were established with the aid of JH,H, NOESY spectra and quantum chemical CD calculation. The pyromyxones A-D possess the undescribed nor-guanacastane skeleton. Tested pyromyxones A, B, and D exhibit only weak activity against gram-positive Bacillus subtilis and gram-negative Aliivibrio fischeri as well as the phytopathogenic fungi Botrytis cinerea, Septoria tritici and Phytophthora infestans.

Publications

Bathe, U.; Tissier, A.; Cytochrome P450 enzymes: A driving force of plant diterpene diversity Phytochemistry 161 149-162 (2019) DOI: 10.1016/j.phytochem.2018.12.003
  • Abstract
  • BibText
  • RIS

In plant terpene biosynthesis, oxidation of the hydrocarbon backbone produced by terpene synthases is typically carried out by cytochrome P450 oxygenases (CYPs). The modifications introduced by CYPs include hydroxylations, sequential oxidations at one position and ring rearrangements and closures. These reactions significantly expand the structural diversity of terpenoids, but also provide anchoring points for further decorations by various transferases. In recent years, there has been a significant increase in reports of CYPs involved in plant terpene pathways. Plant diterpenes represent an important class of metabolites that includes hormones and a number of industrially relevant compounds such as pharmaceutical, aroma or food ingredients. In this review, we provide a comprehensive survey on CYPs reported to be involved in plant diterpene biosynthesis to date. A phylogenetic analysis showed that only few CYP clans are represented in diterpene biosynthesis, namely CYP71, CYP85 and CYP72. Remarkably few CYP families and subfamilies within those clans are involved, indicating specific expansion of these clades in plant diterpene biosynthesis. Nonetheless, the evolutionary trajectory of CYPs of specialized diterpene biosynthesis is diverse. Some are recently derived from gibberellin biosynthesis, while others have a more ancient history with recent expansions in specific plant families. Among diterpenoids, labdane-related diterpenoids represent a dominant class. The availability of CYPs from diverse plant species able to catalyze oxidations in specific regions of the labdane-related backbones provides opportunities for combinatorial biosynthesis to produce novel diterpene compounds that can be screened for biological activities of interest.

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