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Autor Nach Häufigkeit alphabetisch sortiert: Monostori, T
Autor Nach Häufigkeit alphabetisch sortiert: Wasternack, C
Autor Nach Häufigkeit alphabetisch sortiert: Sharma, V.K
Autor Nach Häufigkeit alphabetisch sortiert: Maucher, H
Autor Nach Häufigkeit alphabetisch sortiert: Wasternack, C.
Autor Nach Häufigkeit alphabetisch sortiert: Porzel, A.
Journal / Buchreihe / Preprint-Server Nach Häufigkeit alphabetisch sortiert: Phytochemistry
Journal / Buchreihe / Preprint-Server Nach Häufigkeit alphabetisch sortiert: Acta Physiol. Plantar.
Journal / Buchreihe / Preprint-Server Nach Häufigkeit alphabetisch sortiert: Biochem. Soc. Trans.
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Journal / Buchreihe / Preprint-Server Nach Häufigkeit alphabetisch sortiert: Nat. Chem. Biol.
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Fonseca, S.; Chini, A.; Hamberg, M.; Adie, B.; Porzel, A.; Kramell, R.; Miersch, O.; Wasternack, C.; Solano, R.; (+)-7-iso-Jasmonoyl-L-isoleucine is the endogenous bioactive jasmonate Nat. Chem. Biol. 5, 344-350, (2009) DOI: 10.1038/nchembio.161
Hormone-triggered activation of the jasmonate signaling pathway in Arabidopsis thaliana requires SCFCOI1-mediated proteasome degradation of JAZ repressors. (−)-JA-L-Ile is the proposed bioactive hormone, and SCFCOI1 is its likely receptor. We found that the biological activity of (−)-JA-L-Ile is unexpectedly low compared to coronatine and the synthetic isomer (+)-JA-L-Ile, which suggests that the stereochemical orientation of the cyclopentanone-ring side chains greatly affects receptor binding. Detailed GC-MS and HPLC analyses showed that the (−)-JA-L-Ile preparations currently used in ligand binding studies contain small amounts of the C7 epimer (+)-7-iso-JA-L-Ile. Purification of each of these molecules demonstrated that pure (−)-JA-L-Ile is inactive and that the active hormone is (+)-7-iso-JA-L-Ile, which is also structurally more similar to coronatine. In addition, we show that pH changes promote conversion of (+)-7-iso-JA-L-Ile to the inactive (−)-JA-L-Ile form, thus providing a simple mechanism that can regulate hormone activity through epimerization.
Weichert, H.; Kohlmann, M.; Wasternack, C.; Feussner, I.; Metabolic profiling of oxylipins upon sorbitol treatment in barley leaves Biochem. Soc. Trans. 28, 861-862, (2001) DOI: 10.1042/bst0280861
In barley leaves 13-lipoxygenases (LOXs) are induced by salicylate and jasmonate. Here, we analyse by metabolic profiling the accumulation of oxylipins upon sorbitol treatment. Although 13-LOX-derived products are formed and specifically directed into the reductase branch of the LOX pathway, accumulation is much later than in the cases of salicylate and jasmonate treatment. In addition, under these conditions only the accumulation of jasmonates as additional products of the LOX pathway has been found.
Weichert, H.; Kolbe, A.; Wasternack, C.; Feussner, I.; Formation of 4-hydroxy-2-alkenals in barley leaves Biochem. Soc. Trans. 28, 850-851, (2000) DOI: 10.1042/bst0280850
In barley leaves 13-lipoxygenases are induced by jasmonates. This leads to induction of lipid peroxidation. Here we show by in vitro studies that these processes may further lead to autoxidative formation of (2E)-4-hydroxy-2-hexenal from (3Z)-hexenal.