Geschmack ist vorhersagbar: Mit FlavorMiner. FlavorMiner heißt das Tool, das IPB-Chemiker und Partner aus Kolumbien jüngst entwickelt haben. Das Programm kann, basierend auf maschinellem Lernen (KI), anhand der…
Seit Februar 2021 bietet Wolfgang Brandt, ehemaliger Leiter der Arbeitsgruppe Computerchemie am IPB, sein Citizen Science-Projekt zur Pilzbestimmung an. Dafür hat er in regelmäßigen Abständen öffentliche Vorträge zur Vielfalt…
Pyrofomins A-D, four polyoxygenated sesquiterpenoids have been isolated from the methanolic extract of the fruit bodies of Pyrofomes demidoffii. Their structures are elucidated by IR, HR-FTICR-MS, and 2D NMR spectroscopy. Furthermore, the cedrane carbon skeleton of pyrofomin A (1) is confirmed by X-ray crystallographic analysis. The sesquiterpenoids 1–4 show neither cytotoxicity against KB cells nor antimicrobial activity.
Publikation
Myint Khine, M.; Franke, K.; Arnold, N.; Porzel, A.; Schmidt, J.; Wessjohann, L. A.;A new cardenolide from the roots of Streptocaulon tomentosumFitoterapia75779-781(2004)DOI: 10.1016/j.fitote.2004.06.007
A new cardenolide, (17α)-H-periplogenin-3-O-β-d-glucopyranosyl-(1–4)-2-O-acetyl-3-O-methyl-β-fucopyranoside (1), was isolated from the roots of Streptocaulon tomentosum.
Publikation
Frick, S.; Chitty, J. A.; Kramell, R.; Schmidt, J.; Allen, R. S.; Larkin, P. J.; Kutchan, T. M.;Transformation of opium poppy (Papaver somniferum L.) with antisense berberine bridge enzyme gene (anti-bbe) via somatic embryogenesis results in an altered ratio of alkaloids in latex but not in rootsTransgenic Res.13607-613(2004)DOI: 10.1007/s11248-004-2892-6
The berberine bridge enzyme cDNA bbe from Papaver somniferumL. was transformed in antisense orientation into seedling explants of the industrial elite line C048-6-14-64. In this way, 84 phenotypically normal T0 plants derived from embryogenic callus cultures were produced. The selfed progeny of these 84 plants yielded several T1 plants with an altered alkaloid profile. One of these plants T1-47, and its siblings T2-1.2 and T2-1.5 are the subject of the present work. The transformation of these plants was evaluated by PCR, and northern and Southern hybridisation. The transgenic plants contained one additional copy of the transgene. The alkaloid content in latex and roots was determined with HPLC and LC-MS. We observed an increased concentration of several pathway intermediates from all biosynthetic branches, e.g., reticuline, laudanine, laudanosine, dehydroreticuline, salutaridine and (S)-scoulerine. The transformation altered the ratio of morphinan and tetrahydrobenzylisoquinoline alkaloids in latex but not the benzophenanthridine alkaloids in roots. The altered alkaloid profile is heritable at least to the T2 generation. These results are the first example of metabolic engineering of the alkaloid pathways in opium poppy and, to our knowledge, the first time that an alkaloid biosynthetic gene has been transformed into the native species, followed by regeneration into a mature plant to enable analyses of the effect of the transgene on metabolism over several generations.
Publikation
Blitzke, T.; Masaoud, M.; Schmidt, J.;Constituents of Aloe rubroviolaceaFitoterapia7278-79(2001)DOI: 10.1016/S0367-326X(00)00239-2