ABSTRACT: Prevotella bryantii B14 was cultivated with monensin. Growth was monitored over a period of 9h with a broad range of monensin concentrations.
Project description:Prevotella bryantii B14 was cultivated with monensin. Growth was monitored over a period of 72h including frequent sampling of cells.
Project description:We performed shotgun proteomics on the bacteria Prevotella brevis GA33 and Prevotella ruminicola 23. We did this for two types of samples (cell extract and cell membrane) and using two methods (data-dependent and data-independent acquisition).
Project description:The transcriptional responses of Prevotella ruminicola were determined during growth on 20 different carbohydrate sources including mono-, di- and tri- saccharides, oligosaccharides, polymeric xylan and complete plant material with the aim of obtaining a more complete understanding of the number of genes and metabolic networks associated with carbohydrate catabolism by this organism All microarray hybridizations and subsequent scanning was undertaken using a two colour system (Cy3 and Cy5): 34 samples
Project description:The transcriptional responses of Prevotella ruminicola were determined during growth on 20 different carbohydrate sources including mono-, di- and tri- saccharides, oligosaccharides, polymeric xylan and complete plant material with the aim of obtaining a more complete understanding of the number of genes and metabolic networks associated with carbohydrate catabolism by this organism
Project description:P. bryantii B14 cells were cultivated separately in acetic (Acet), propionic (Prop), butyric (But), iso-butyric (iBut), valeric (Val), iso-valeric (iVal) and 2-methyl butyric acid (2MB) as well as in a mixture of all mentioned short-chain fatty acids (Mix). All 8 treatments were analyzed regarding their proteomes in order to understand the requirements and effects of each SCFA on the metabolism.
Project description:The time-resolved impact of monensin on the active rumen microbiome in a rumen-simulating technique (Rusitec) was studied with metaproteomic and metabolomic approaches. Upon monensin treatment, decreased catabolism linked to fiber degradation was observed by the reduced abundance of proteins assigned to fibrolytic bacteria and glycoside hydrolases, sugar transporters and carbohydrate metabolism. Reduced amounts of ammonium as well as branched-chain fatty acids pointed towards a decreased proteolytic activity. The family Prevotellaceae exhibited increased resilience in the presence of monensin, with a switch of metabolism from acetate to succinate production. Prevotella species harbor a membrane bound electron transfer complex, which drives the reduction of fumarate to succinate, the substrate for propionate production in the rumen habitat. Besides the increased succinate production, a concomitant depletion of methane concentration was observed upon monensin exposure. Our study demonstrates that Prevotella sp. shifts its metabolism successfully in response to monensin exposure and Prevotellaceae represents the key bacterial family stabilizing the rumen microbiota during exposure to monensin.
Project description:Gut microbiota participates in diverse metabolic and homeostatic functions related to health and well-being. Individual variation in its composition depends on many factors including dietary factors. We profiled enzymatic activity of fecal microbiota in 63 healthy adult individuals using metaproteomics, and identified Bacteroides and Prevotella –derived microbial CAZy (carbohydrate-active) enzymes involved in glycan foraging. One particular profile with many Bacteroides-derived CAZy was identified in one-third of subjects (n=20), and it associated with high abundancy of Bacteroides in most subjects. In other subjects (n=8) with dietary parameters similar to former, microbiota showed intense expression of Prevotella-derived CAZy including exo−beta−(1,4)−xylanase, xylan-1,4−beta−xylosidase, alpha−L−arabinofuranosidase and several other CAZy belonging to glycosyl hydrolase families involved in digestion of complex plant-derived polysaccharides. This associated invariably with robust representation of Prevotella in gut microbiota, while subjects with intermediate representation of Prevotella showed no CAZy profile. Identification of Bacteroides- and Prevotella-derived CAZy in microbiota proteome and their association with robust differences in microbiota composition, the latter with exceptionally high Prevotella abundancy in the gut, are in evidence of individual variation in metabolic adaptation of gut microbiota with an impact on colonizing competence.