Project description:Corynebacterium glutamicum can survive by using ferulic acid as the sole carbon source. In this study, we assessed the response of C.glutamicum to ferulic acid stress by means of a global transcriptional response analysis. The transcriptional data showed that several genes involved in degradation of ferulic acid were affected. Moreover, several genes related to the stress response; protein protection or degradation and DNA repair; replication, transcription and translation; and the cell envelope were differentially expressed. Deletion of the katA or sigE gene in C. glutamicum resulted in a decrease in cell viability under ferulic acid stress. These insights will facilitate further engineering of model industrial strains, with enhanced tolerance to ferulic acid to enable easy production of biofuels from lignocellulose.
Project description:Improved Fermentative Production of Gamma-Aminobutyric Acid via the Putrescine Route: Systems Metabolic Engineering for Production From Glucose, Amino Sugars, and Xylose
Project description:The dicarboxylic acid glutarate is gaining attention in the chemical and pharmaceutical industry as promising building-block. Synthesis of glutarate via microbial fermentation is a desirable aim which will allow the production of biopolymers avoiding fossil raw materials. Here, by rational metabolic engineering of the biofactory microorganism Corynebacterium glutamicum the fermentative production of glutarate from glucose was established. Modifications focused on increase glucose consumption and reduce by-products formation together with the heterologous overexpression of the L-lysine decarboxylase, putrescine transaminase and putrescine dehydrogenase genes from E. coli in the L-lysine producer GRLys1 allowed production the glutarate precursor 5-aminovalerate. Additional heterologous overexpression of 5-aminovalerate amino transferase and glutarate-semialdehyde dehydrogenase genes from C. glutamicum and three Pseudomonas species enabled glutarate synthesis from glucose. By coupling glutarate production with the glutamate synthesis of C. glutamicum glutarate titer improved 10%. The final strain was tested in a glucose-based fed-batch fermentation
Project description:In summary, we have identified and characterized FtsR as a transcriptional activator of the essential cell division protein FtsZ in C. glutamicum, providing a novel regulatory player in the process of cell division.
Project description:In this study, we implemented a highly robust workflow for O-phosphopeptides enrichment utilizing titanium-based immobilized metal affinity chromatography (Ti-IMAC). By integrating an offline reversed-phase prefractionation strategy and a combination of Electron-Transfer/Higher-Energy Collision Dissociation (EThcD) and Higher-Energy Collision Dissociation (HCD) mass spectrometry fragmentation techniques, we established the most comprehensive phosphoproteomic dataset for this species to our knowledge.