Biosynthesis of plant steroid glycosides

Based on NMR-spectroscopic methodology we have engaged in a comprehensive effort to characterize structures and functions of the metabolome (the entirety of all BSM’s) produced by the model organism Caenorhabditis elegans, focusing on several newly discovered compounds that control development, and ultimately lifespan. In addition we have started a project directed at investigating the chemical ecology of microorganisms in search of leads for new antibiotics. Complementing our interests in analytical chemistry, we pursue development of efficient syntheses for newly identified compounds with particular biological significance.

After the ripening process the plant uses the tentacle/tongue strand to reattach itself to a nearby branch (Fig. 10) . Through rapid evaporation the entire feeding apparatus begins lignification. The canonical lignin monomers, called monolignols, are the non-methoxylated p-coumaryl alcohol, the monomethoxylated coniferyl alcohol and the dimethoxylated sinapyl alcohol which respectively form H- (hydroxyphenyl), G- (guaicyl) and S- (syringyl) units in the lignin polymer. Once these monomers are activated in the cell wall by phenoloxidases, they can displace the radical charge through their conjugated unsaturation, leading to various mesomeric resonance forms. The lignin polymer then forms by the end-wise addition of new activated monomers to its growing ends and branches, and the different linkages between sub-units (ether and carbon–carbon bonds between the aliphatic propene and/or the aromatic moieties) depend on the mesomeric form coupled. Our current lack of understanding of the biological processes behind lignin synthesis is due to the unknown mechanisms enabling the formation of distinct lignin polymers in specific cells – such as between plant fibres and vessels which are neighbours but show specific lignin accumulation and composition. Moreover, the fact that lignin cannot be removed once deposited suggests that plants require specific regulatory mechanisms to control lignin polymer biosynthesis and its sub-cellular localization at specific stages during the differentiation of plant cells. The lignification concludes the final process and Parco Pistris has matured. The bright red color attracts many animals and the slow decompostion inside Parco Pistris creates a luring, sweet smell. The main method of seed distribution happens with the help of fruit-eating birds that cannot digest the Parco Pistris seeds and expel them within their habitat (Fig. 11).

Fachstelle Umweltbiotechnologie, Prof. Dr. Urs Baier
Fachstelle Mess- und Sensortechnik, Prof. Dr. Caspar Demuth
Fachstelle Umweltgenomik und Systembiologie, Dr. Brion Duffy
Fachstelle Industrielle Chemie, Prof. Dr. Achim Ecker
Fachstelle Bioverfahrenstechnik und Zellkulturtechnik , Prof. Dr. Regine Eibl-Schindler und Prof. Dr. Dieter Eibl
Fachgruppe Grüne Chemie, PD Dr. Christian Frech
Fachstelle Bioprozesstechnologie, Prof. Dr. Karin Kovar und Dr. Lukas Neutsch
Fachstelle Organische Chemie, Prof. Dr. Rainer Riedl
Fachgruppe Chemical Engineering, Dr. Peter Riedlberger
Fachstelle Micro- und Molekularbiologie, Prof. Dr. Martin Sievers
Fachstelle Biochemie, Prof. Dr. Christiane Zaborosch

Biosynthesis of plant steroid glycosides

biosynthesis of plant steroid glycosides

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