261 search results for “enzyme” in the Public website
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In Pursuit of Next-Generation Lipopeptide Antibiotics
Can new variants of daptomycin and the polymyxins be found?
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Impaired barrier of inflammatory skin diseases
Focus in skin research
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Signalling pathways that control development and antibiotic production in streptomyces
Bacteria are highly complex and diverse organisms that have adapted to survive in ecological niches ranging from the most extreme to the most heterogeneous environments.
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Systems pharmacology of the endocannabinoid system
In this thesis, a system pharmacology approach, integrating metabolomics, pharmacology and chemical biology, was applied to understand and modulate the endocannabinoid system across different model systems (cells, zebrafish, mice and humans).
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Inhibitors and activity-based probes for β-D-glucuronidases, heparanases and β-L-arabinofuranosidases
Glycosidases (GHs) are enzymes responsible for the degradation of carbohydrates and play many roles in human health and pathophysiology. Often, abnormal levels of glycosidase activity are markedly linked to human pathologies.
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First-pass and systemic metabolism of cytochrome P450 3A substrates in neonates, infants, and children
Growth and development affect the metabolism of drugs administered to neonates, infants, and children.
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NO-ESKAPE New Strategies for Overcoming the ESKAPE Pathogens
Natural product inspired antibiotics to address resistance
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Morphogenesis and heterogeneity in liquid-grown streptomyces cultures
The filamentous bacteria Streptomyces are widespread inhabitants of terrestrial soils.
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Modelling metastatic melanoma in zebrafish
Death in all types of melanomas is generally caused by metastasis. Uveal melanoma (UM) is the most common intraocular melanoma, there are currently no (patient-derived) animal models that faithfully recapitulate metastatic dissemination of UM.
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Design and development of conformational inhibitors and activity-based probes for retaining glycosidases
Glycosidases are essential in fundamental biological processes and are responsible for the degradation of most (oligo)saccharides, glycolipids and glycoproteins.
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Macromolecular Biochemistry
Macromolecular Biochemistry is a section of the Leiden Institute of Chemistry at Leiden University, comprising the PIs Marcellus Ubbink, Remus Dame, Aimee Boyle, Lars Jeuken and Anne Wentink.
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Chemical genetic approaches for target validation
Drug development is a time- and resource-consuming process that starts with the discovery and validation of a (protein) target that contributes to pathogenesis or disease progression.
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Chemical tools to study lipid signaling
Synthesis and application of chemical biology tools to study immunomodulatory signaling lipids.
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Target Discovery
The goal of target discovery is to identify and validate proteins and biological pathways that are involved in the disease process. Modulating these target proteins and pathways with small molecules, therapeutic proteins or other biomolecules (e.g. mRNA) could deliver an effective and safe drug or v…
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Applications for activity-based probes in biomedical research on glycosidases
Lysosomal glycosidases are acid hydrolases that fragment glycoconjugates in lysosomes.
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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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Ecological functioning of bacterial chitinases in soil
Promotores: Prof.dr. H. van Veen & Prof.dr. W. de Boer (Wageningen University)
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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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Modern Drug Discovery
How are new drugs developed? This question is central to the Minor Modern Drug Discovery (MDD), which covers the entire trajectory from disease to drug molecule and vice versa. The various research groups involved offer a complementary and interdisciplinary perspective by connecting the diverse subjects…
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Identification and characterization of developmental genes in streptomyces
Promotor: Prof.dr. G.P. van Wezel
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Chemical biology of glucosylceramide metabolism fundamental studies and applications for Gaucher disease
This thesis describes biochemical investigations of glucocerebrosidase (GBA), the lysosomal β- glucosidase that is deficient in Gaucher disease (GD).
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Cheminformatics: Analyzing small-molecule activity data
While bioinformatics methods deal with the analysis of sequence information (be it proteins or DNA), the field of cheminformatics is concerned with the analysis of small-molecule datasets.
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Inhibitors and probes targeting mannanases
This thesis describes the synthesis and biochemical evaluation of a variety of cyclophellitol based activity-based probes and inhibitors targeting various endo- and exo-acting retaining glycosidases. In the last two decades a variety of probes and inhibitors for (hemi)cellulose degrading enzymes have…
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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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Cyclophellitol analogues for profiling of exo- and endo-glycosidases
To this day, all cyclophellitol-based inhibitors and ABPs have been close analogues of their natural substrate counterparts. As a result, these probes showed high selectivity towards their target glycosidases.
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Combined LC/MS-platform for analysis of all major stratum corneum lipids, and the profiling of skin substitutes
Ceramides (CERs), cholesterol, and free fatty acids (FFAs) are the main lipid classes in human stratum corneum (SC, outermost skin layer), but no studies report on the detailed analysis of these classes in a single platform.
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The evolution of the diversity of secondary metabolites
Why do plants produces always produced so many slightly differing metabolites within a particular chemical class?
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Hybrid vesicles
Synthetic cells, also known as artificial cells or protocells, have wide ranging applications from drug delivery vectors to cell models. In biotechnology they can function as micro- or nanoreactors with possible applications in biocatalysis and photocatalysis. Phospholipids are by far the most commonly…
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The electrochemical reduction of dioxygen and hydrogen peroxide by molecular copper catalysts
The electrochemical oxygen reduction reaction (ORR) is an essential half-reaction for the utilization of hydrogen as a sustainable fuel, via the conversion of hydrogen to electrons and protons facilitated by the ORR. In the most common fuel cells, the ORR is requires high loadings of non-abundant platinum…
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CD8+ T-cells in atherosclerosis: mechanistic studies revealing a protective role in the plaque microenvironment
Atherosclerosis is the most important underlying process that drives cardiovascular disease, and is characterized by an accumulation of cholesterol which triggers an inflammatory response in the vessel wall.
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Synthetic Methodology Towards ADP-Ribosylation Related Molecular Tools
Phosphorylation affects all four major biomolecules – proteins, lipids, carbohydrates and nucleic acids – and plays a pivotal role in the most fundamental cellular functions.
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Bernd Schneider
Dr. at Max Planck Institute for chemical Ecology, Jena - Germany
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Biotransformation of plant metabolites in microorganisms
- How to deconvolute metabolic mixture of precursors and products by biontransformation? - How to optimize the reaction conditions to produce bioactive compounds in biotransformation? - What is the effect of co-treating fungi or bacteria for biotransformations?
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Fundamental and translational medical biochemistry
Through metabolism, biochemical processes give rise to the complexity of life. Acquired and inborn errors in metabolism underlie many diseases occurring in man. The challenge for present day medical biochemistry is to find, and integrate, pieces of information at molecular, cell and organismal level…
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Bio-organic Synthesis
The research in the Biosyn group is focused on the design, synthesis and function of the four major types of biomolecules: nucleic acids, carbohydrates, peptides and lipids and hybrid structures thereof. These biomolecules and their derivatives are used in drug discovery and chemical biology, to develop…
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ParaNMR Facility
The Paramagnetic NMR Facility Leiden has been established to provide support to researchers who want to apply paramagnetic NMR spectroscopy to biomolecules. Support is offered in the design and synthesis of paramagnetic probes, either for general application (such as lanthanide tags and spin labels)…
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Polypept(o)ide-based nanostructures for therapeutic and diagnostic application
Nanoparticles exhibit a number of adjustable properties, e.g., their size, shape, and surface and core chemistry, which can be further diversified with different functional moieties. This opens a broad field for application in diagnostic and therapy. In this respect, the use of a polymeric hybrid material,…
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Exploring the potentials of nurture: 2(nd) and 3(rd) generation explant human skin equivalents
BACKGROUND: Explant human skin equivalents (Ex-HSEs) can be generated by placing a 4mm skin biopsy onto a dermal equivalent. The keratinocytes migrate from the biopsy onto the dermal equivalent, differentiate and form the epidermis of 1(st) generation Ex-HSEs. This is especially suitable for the expansion…
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Programme
The symposium is open to all registered participants and consists of two sessions and a Poster Session.
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Functions of autophagy in the filamentous fungus Aspergillus niger
What are the functions of autophagy in the filamentous fungus Aspergillus niger?
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Mathematics-based strategies for repairing tumour blood vessels
How does the extracellular matrix coordinate endothelial cell behavior during angiogenesis, and how do metabolic waste-products and matrix-degrading enzymes produced by the tumour modify the extracellular matrix so as the change the cellular coordination?
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Knowledge of DNA repair in the fight against tumour cells
What is the most effective way to eliminate tumour cells? The DNA repair mechanism could play an important role in increasing the effectiveness of chemotherapy in the fight against cancerous cells. If we are to influence this mechanism, we need fundamental knowledge about how the mechanism works.
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Making sustainable biotechnology a reality: joined forces aim to improve biocatalysts
Everything biobased: Plastic, medicine and fuel. It seems like a futuristic utopia. But for how long? A collaboration of researchers now proposes an idea to accelerate the development process. By combining machine learning and laboratory automation, this biobased ideal may become a reality rather sooner…
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Breakthrough by Leiden researchers in Pompe disease
Researchers at Leiden University have made a breakthrough in the study of the hereditary Pompe disease. Together with colleagues in York, they have developed a molecule that binds to the enzyme that is key to the progress of the disease. The findings have been published in ACS Central Science.
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ERC Synergy Grant to unlock sugar codes for health and a sustainable society
Hermen Overkleeft and his colleagues Gideon Davies (University of York) and Carme Rovira (University of Barcelona) will receive a 9.1 million euros Synergy Grant from the European Research Council. Together, they will form the Carbocentre Synergy team for research into enzymes that work on glycans:…
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Researchers discover how malaria parasite survives in mosquitoes
Researchers from Leiden University Medical Center (LUMC) have discovered how malaria parasites escape the immune system of mosquitoes. The so-called QC enzyme changes proteins on the outside of the malaria parasite such that the immune cells are unable to recognise the parasite. As a result, the parasite…
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NWO-grant for degration of biomass
Dr. Erik Vijgenboom (IBL) and Dr. Peter Punt (IBL/TNO) obtained a new NWO-grant for their project FILAZYME to develop filamentous micro-organisms for enzyme production to degrade biomass.
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Supramolecular and Biomaterials Chemistry
Alexander Kros studies supramolecular systems in a biological environment. The unifying theme between the projects in my lab is specific molecular recognition, i.e. the intermolecular interaction between complementary molecules with high affinity and selectivity. Studying, imitating and dissecting processes…
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Invited speakers
Speakers that have accepted to participate:
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Promising new technique to treat cancer receives NWO grant
Biological chemist Nathaniel Martin and his team received an NWO grant to examine how blocking a specific enzyme in our body, NNMT, could be helpful in the treatment of some cancers. Trials with mice have been promising, and together with the Netherlands Cancer Institute, Martin wants to take the next…