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Autor Nach Häufigkeit alphabetisch sortiert: Monostori, T
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Autor Nach Häufigkeit alphabetisch sortiert: Wasternack, C.
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Journal / Buchreihe / Preprint-Server Nach Häufigkeit alphabetisch sortiert: Phytochemistry
Journal / Buchreihe / Preprint-Server Nach Häufigkeit alphabetisch sortiert: Acta Physiol. Plantar.
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Autor Nach Häufigkeit alphabetisch sortiert: Kepczynski, J.
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Schilling, S.; Hoffmann, T.; Wermann, M.; Heiser, U.; Wasternack, C.; Demuth, H.-U.; Continuous Spectrometric Assays for Glutaminyl Cyclase Activity Anal. Biochem. 303, 49-56, (2002) DOI: 10.1006/abio.2001.5560
The enzymatic conversion of one chromogenic substrate, -glutamine-p-nitroanilide, and two fluorogenic substrates, -glutaminyl-2-naphthylamide and -glutaminyl-4-methylcoumarinylamide, into their respective pyroglutamic acid derivatives by glutaminyl cyclase (QC) was estimated by introducing a new coupled assay using pyroglutamyl aminopeptidase as the auxiliary enzyme. For the purified papaya QC, the kinetic parameters were found to be in the range of those previously reported for other glutaminyl peptides, such as Gln-Gln, Gln-Ala, or Gln-tert-butyl ester. The assay can be performed in the presence of ammonia up to a concentration of 50 mM. Increasing ionic strength, e.g., potassium chloride up to 300 mM, resulted in an increase in enzymatic activity of about 20%. This is the first report of a fast, continuous, and reliable determination of QC activity, even in the presence of ammonium ions, during the course of protein purification and enzymatic analysis.
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.