236 search results for “bacterial” in the Public website
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Bacterial Chromatin
The relative simplicity of the bacterial cell, short generation times and well defined and inexpensive culturing conditions have significantly contributed to our understanding of many complex biological systems. Yet the workings of the bacterial genome, seemingly impossibly compressed within a tiny…
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Ecological functioning of bacterial chitinases in soil
Promotores: Prof.dr. H. van Veen & Prof.dr. W. de Boer (Wageningen University)
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Bacterial Chromatin: Methods and Protocols
Authoritative and cutting-edge, Bacterial Chromatin: Methods and Protocols aims to be useful as an up-to-date reference work for scholars in the bacterial chromatin field, those entering the field from adjacent research fields, and scientists in the eukaryotic chromatin field.
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Bacterial glycomimetics: synthesis and applications
This work has described synthetic strategies towards well-defined structures resembling capsular polysaccharide (CPS) fragments, CPS mimics, teichoic acid (TA) fragments as well as a third-generation ring-closing tandem metathesis (RCM) linker to better exploit the potential of automated synthesis.
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Small-molecule inhibitors of bacterial metallo-β-lactamases
The main focus of the thesis is the discovery and development of novel inhibitors of bacterial metallo-β-lactamases (MBLs).
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Growth-induced self-organization in bacterial colonies
Mechanical forces are known to play an important role in bacterial colonies. In this dissertation, we study the self-organization at various stages of growing bacterial colonies, and focus on the mechanical effects of cell growth.
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Cryo Electron Tomography Studies On Bacterial Chemosensory Arrays
Bacterial chemosensory arrays are protein assemblies that are the key structural and functional component for motile bacteria to sense their internal or environmental chemical signals.
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Regulation of autophagy-related mechanisms during bacterial infection
Autophagy is a fundamental degradative process, maintaining cellular homeostasis and functions in host defense against intracellular pathogens, including mycobacteria and Salmonella.
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Assemblage and functioning of bacterial communities in soil and rhizosphere
Promotores: J.A.van Veen, P.L.G.Klinkhamer. Co-promotor: E.E.Kuramae
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Dynamic organization of bacterial chromatin by DNA bridging proteins
Bacteria often experience external challenges, such as changes in environmental conditions or attacks by bacteriophages.
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Witnessing the Process of Bacterial Cell Death: Novel Antimicrobials and Their Mechanisms of Action
This thesis describes the antimicrobial discovery strategy developed in our group, the den Hertog Group at the Hubrecht Institute. It includes a cultivation-based screening approach for novel antimicrobial agents from the source of fungi, and a bacterial time-lapse imaging approach for antimicrobial…
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Structural characterization of bacterial proteins involved in antibiotic resistance and peptidoglycan biosynthesis
This thesis describes the structural and biochemical characterization of the β-lactamase BlaC from Mycobacterium tuberculosis (Mtb), and the Alr and YlmE proteins from Streptomyces coelicolor A3(2).Mtb is the main cause of tuberculosis.
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Involvement of host and bacterial factors in Agrobacterium-mediated transformation
Agrobacterium tumefaciens, a gram-negative plant pathogen belonging to the family Rhizobiaceae, is the causative agent of crown gall disease, which can affect many plant species including agronomically important ones.
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Synthesis of phosphodiester-containing bacterial cell wall components: teichoic acids, capsular polysaccharides and phosphatidyl glycerol analogues
Promotor: G.A. van der Marel, Co-promotor: J.D.C. Codée
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Evolution of bacterial movement revealed
An international team with researchers from Leiden revealed how a bacterium repurposed an internal system to control its movements. Movement control is very important in host invasion, which can lead to disease. Publication on 27 April in Nature Communications.
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inhibit human osteosarcoma cell growth after activation with the bacterial cell wall derivative liposomal muramyl tripeptide in combination with
CONCLUSION: This study demonstrates that human macrophages can be induced to exert direct anti-tumor activity against osteosarcoma cells. Our observation that the induction of macrophage anti-tumor activity by L-MTP-PE required IFN-gamma may be of relevance for the optimization of L-MTP-PE therapy in…
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A computational tool that will transform bacterial genome analysis
Whether a microbe is beneficial or harmful to a plant can now be predicted with high accuracy thanks to bacLIFE. This bioinformatic tool with an intuitive interface makes it much easier to unlock the secrets of bacterial genomes. A group of Leiden biologists presented it in Nature Communications.
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Mapping of bacterial genomes to combat infectious diseases
Mapping of bacterial genomes to combat infectious diseases
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funding for LACDR research project to develop novel biomarkers for bacterial infections
As part of the ZonMW Antibiotics resistance funding program, the LACDR cluster Systems Pharmacology was awarded €455.255 for a research project to develop novel clinical biomarkers for bacterial infections.
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Marjolein Crooijmans
Science
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Determining the structure of a chemotaxis kinase complex with receptor mimetics and cryo-EM
Can we determine the 3D structure of a chemotaxis core complex using single-particle reconstructions via cryo-EM?
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Solvent tolerance mechanisms in Pseudomonas putida
Bacterial biocatalysis constitutes a sustainable alternative for high-value chemicals production by enabling the utilization of renewable feedstocks.
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Bacterial glycomimetics: synthesis and applications
PhD defence
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Microbial Induction of Plant Resilience to Drought Stress (MicroRes)
What are the genes and molecular mechanisms involved in bacteria-mediated plant drought tolerance?
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Microbial Chemotaxis
In order to gain insight into the structure and function of the molecular complexes involved in chemotaxis, we use electron cryotomography (ECT). This technique allows us to directly study microbes in their native state at resolutions capable of visualizing individual proteins.
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Student projects
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Cryo-EM of cholera infection
The structure of bacterial cells provides crucial clues about their interaction with their host. What are the key structural features of a bacterial cell that determine pathogenicity? What roles do these structures play in the life cycle, and how do they change during the infection process?
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Evolution & Biodiversity in Microbial Sciences
Microbial Sciences' contribution to the Evolution & Biodiversity research theme focuses on understanding how bacteria sense and respond to their environment, and how bacterial diversity and evolution is influenced by cooperative and antagonistic interactions taking place between microbes.
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Search and rescue: tackling antibiotic resistance with chemistry
With the rise of multi-drug resistant bacterial pathogens, the possibility of a post-antibiotic world is quickly becoming reality.
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Synthesis of Ribitol Phosphate based Wall Teichoic acids
Antibiotic resistance, caused by widespread use of antibiotics, leads to bacterial infections that are difficult, if not impossible, to treat and is a major worldwide health concern.
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Innate immune defence against intracellular pathogens
What are the host immune defence mechanisms that control intracellular infections and how are these subverted by pathogens?
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Effect of Nanoparticles on Microbial Catabolism and Community Structure using Biolog techniques
1. To what extent do metallic NPs added to soil extractions change the activity, abundance, or community composition of microbes? 2. How do the effects of metallic NPs on soil microbes differ from the effects of the ions shedding from corresponding NPs?
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Regulation of autophagy-related mechanisms during bacterial infection
PhD defence
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Unfolding the principles of genome folding and dynamics in bacteria
What are the principles of genome folding and dynamics in bacteria?
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Quantitative Pharmacology
The Quantitative Pharmacology group headed by Coen van Hasselt focusses on the application of state-of-the-art quantitative pharmacometrics and systems pharmacology modeling combined with translational experimental models to develop personalized treatment strategies for antibiotics and to combat antimicrobial…
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NO-ESKAPE New Strategies for Overcoming the ESKAPE Pathogens
Natural product inspired antibiotics to address resistance
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Fate, accumulation and impact of metallic nanomaterials in the terrestrial environment
The rapidly increasing commercial application of metallic nanoparticles within products will inevitably enhance the amount of NPs being released into soil.
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Toll-like receptor signaling in the innate immune system of zebrafish larvae
Promotor: H.P. Spaink, A.H. Meijer Co-promotor: R. Marin-Juez
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European Lead Factory
The European Lead Factory has been created with the ultimate goal to develop lead drug candidates to address neglected diseases including bacterial infections, psychiatric disorders and oncology.
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Antibiotic Discovery: From mechanistic studies to target ID
The investigations described in this thesis lay out strategies aimed at advancing antibiotic research and development. The examples presented revolve around two main approaches: understanding drug-target interactions and target identification.
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Semisynthetic glycopeptide antibiotics
Vancomycin is a last-resort antibiotic for the treatment of many Gram-positive bacterial infections, while remaining inactive against Gram-negative strains.
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Host-Microbe Interactions in Animal Sciences
Animal Sciences’ contributions to the Host-Microbe Interactions research theme focus on the interaction of animal hosts with pathogenic microbes but also the beneficial role of the gut microbiome.
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Antibiotic combination therapies against drug resistant Gram negative pathogens
Can effective synergists be identified to enhance the effect of antibiotics against Gram negative pathogens?
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The rhizomicrobiome of Sorghum ; impact on plant growth and stress tolerance
The overall objectives of my thesis are to investigate the dynamics of the sorghum root microbiome and to explore the beneficial effects of the root microbiome on sorghum growth and stress tolerance.
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Using cryo-EM methods to uncover structure and function of bacteriophages
Bacteriophages, or phages for short, are the most abundant biological entity in nature. They shape bacterial communities and are a major driving force in bacterial evolution.
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The environmentally-regulated interplay between local three- dimensional chromatin architecture and gene expression
Nucleoid associated proteins maintain the architecture of the bacterial chromosome and regulate gene expression, hinting that their role as transcription factors may involve local three-dimensional chromosome re-modelling.
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Bioorthogonal Labeling Tools to Study Pathogenic Intracellular Bacteria
In this thesis, bioorthogonal chemistry is combined with correlative light-electron microscopy to selectively label and study pathogenic intracellular bacteria within the host immune cell.
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Modulation of plant chemistry by rhizosphere bacteria
Plant-microbe interaction resulted in different physio/chemical responses by host plant and interacting rhizobacteria.
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Quest for new antibiotics
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