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Articles 1 - 6 of 6
Full-Text Articles in Microbiology
Unraveling Plant-Microbe-Microbe Interactions: Host And Microbial Colonization Determinants Across Experimental Scales, Bridget O'Banion
Unraveling Plant-Microbe-Microbe Interactions: Host And Microbial Colonization Determinants Across Experimental Scales, Bridget O'Banion
Doctoral Dissertations
Plant microbiomes are assembled and modified through a complex milieu of biotic and abiotic factors. Despite dynamic and fluctuating contributing variables, specific host and microbial mechanisms are likely important mediators of interactions. We combine information from large-scale datasets across diverse plant hosts with experimental genetic manipulation assays in model Arabidopsis seedlings to converge on a conserved role for metabolite production and transport in mediating host-microbe interactions. Applying a diverse set of analytical tools to microbial communities at various complexity levels will advance our knowledge of the scalability of observed phenotypes and, ultimately, help to decipher the mechanisms dictating plant–microbe interactions …
Characterization Of The Chea2 Chemotaxis Operon In Azospirillum Brasilense, Erin Lutz
Characterization Of The Chea2 Chemotaxis Operon In Azospirillum Brasilense, Erin Lutz
Chancellor’s Honors Program Projects
No abstract provided.
Comparative Genomics Of Microbial Chemoreceptor Sequence, Structure, And Function, Aaron Daniel Fleetwood
Comparative Genomics Of Microbial Chemoreceptor Sequence, Structure, And Function, Aaron Daniel Fleetwood
Doctoral Dissertations
Microbial chemotaxis receptors (chemoreceptors) are complex proteins that sense the external environment and signal for flagella-mediated motility, serving as the GPS of the cell. In order to sense a myriad of physicochemical signals and adapt to diverse environmental niches, sensory regions of chemoreceptors are frenetically duplicated, mutated, or lost. Conversely, the chemoreceptor signaling region is a highly conserved protein domain. Extreme conservation of this domain is necessary because it determines very specific helical secondary, tertiary, and quaternary structures of the protein while simultaneously choreographing a network of interactions with the adaptor protein CheW and the histidine kinase CheA. This dichotomous …
Characterization Of Chemosensing In The Alphaproteobacterium Azospirillum Brasilense , Matthew Hamilton Russell
Characterization Of Chemosensing In The Alphaproteobacterium Azospirillum Brasilense , Matthew Hamilton Russell
Doctoral Dissertations
Motile bacteria must navigate their environment in constant search of nutrients to sustain life. Thus they have evolved precise and adaptable sensory systems to achieve this goal, making the navigation system of the model bacterium Escherichia coli the best characterized signal transduction pathway in Biology. However, many bacteria have evolved more sophisticated arsenals for sensing and responding to their environment including chemoreceptors to identify novel attractants in the microenvironment. The diazotrophic alphaproteobacterium Azospirillum brasilense inhabits the soil and colonizes the roots of cereals like rice, corn, and wheat. Like most proteobacterial, A. brasilense encodes multiple chemotaxis-like pathways, 4, of which …
Characterizing Cell-Cell And Cell-Surface Interactions In The Rhizobacterium Azospirillum Brasilense, Calvin Shay Green
Characterizing Cell-Cell And Cell-Surface Interactions In The Rhizobacterium Azospirillum Brasilense, Calvin Shay Green
Masters Theses
Microaerophilic and chemotaxic diazotrophs, azospirilla are found in close association with certain cereals such as durum wheat and maize and are active in enriching these ecological niches with the macronutrient nitrogen as ammonia. Regarded as highly pleomorphic, Azospirillum spp. are highly motile, using either a single polar flagellum when grown in liquid environments or peritrichous lateral flagella in viscous environments. Additionally, azospirilla are able to adhere onto surfaces as a biological film or aggregate cell-to-cell as nonproliferating flocculi, and these two processes having been suggested as positively affecting the survival and dispersal of the bacteria in the soil. Even though …
Use Of Proteomics Tools To Investigate Protein Expression In Azospirillum Brasilense, Gurusahai K. Khalsa-Moyers
Use Of Proteomics Tools To Investigate Protein Expression In Azospirillum Brasilense, Gurusahai K. Khalsa-Moyers
Doctoral Dissertations
Mass spectrometry based proteomics has emerged as a powerful methodology for investigating protein expression. “Bottom up” techniques in which proteins are first digested, and resulting peptides separated via multi-dimensional chromatography then analyzed via mass spectrometry provide a wide depth of coverage of expressed proteomes. This technique has been successfully and extensively used to survey protein expression (expression proteomics) and also to investigate proteins and their associated interacting partners in order to ascertain function of unknown proteins (functional proteomics). Azospirillum brasilense is a free-living diazotrophic soil bacteria, with world-wide significance as a plant-growth promoting bacteria. Living within the rhizosphere of cereal …