1,060 search results for “membrane proteins” in the Public website
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Biophysical characterization of membrane protein-small molecule interactions
Promotor: M. Ubbink, Co-promotor: G. Siegal
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Parkinson’s protein α-synuclein: membrane interactions and fibril structure
The thesis describes the use of electron paramagnetic resonance (EPR) spectroscopy, in continuous wave and pulse modes, to address the interaction of α-Synuclein (αS) with membranes and the aggregation of αS.
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Membrane Interactions
Membrane proteins and membrane interactions of proteins are studied by spin label EPR. Intact, native membranes, vesicles of all sizes and nano-disks can be investigated, because the size of the object does not matter in EPR. Whereas solution NMR is limited to micelles (a few nm in diameter), by EPR…
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Coiled-coils on lipid membranes: a new perspective on membrane fusion
Promotor: J.G.E.M. Fraaije, Co-Promotor: A. Kros
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Lars Jeuken
Science
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A study on PsbS and its role as a pH sensor
Solar energy harnessed by plants and algae has great potential to be converted into biofuels for future generations.
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Membrane Fusion Mediated Intracellular Delivery of Lipid Bilayer Coated Mesoporous Silica Nanoparticles
Alexander Kros and co-workers describe how mesoporous silica nanoparticles (MSNs) are delivered into cells via membrane fusion thereby omitting endocytosis pathways. Fusion is induced by a pair of complementary coiled-coil lipopeptides inserted into the membrane of cells and in the bilayer of lipid-coated…
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Anjali Pandit
Science
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Lipid mediated colloidal interactions
The lipid membrane is a basic structural component of all living cells. Embedded in this nanometer-thin barrier, membrane proteins shape the membrane and at the same time respond to the shape of the membrane.
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Arabidopsis AGC3 kinases and PIN plasma membrane abundance
The plant hormone auxin plays a central role in the growth and development of plants. Auxin acts in a concentration dependent manner and polar cell-to-cell transport of this hormone determines its distribution in the tissues of plants. This polar auxin transport is mediated by several families of auxin…
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The Chara plasma membrane system : an ancestral model for plasma membrane transport in plant cells
Multicellular giant algae Chara species have been widely used in physiological studies for decades.
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Protein Facility
The Protein Centre can supply you with purified proteins that are essential for many experiments, ranging from in vitro inhibitor screening and enzymatic analysis to manipulation of life cells.
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Mesoporous silica nanoparticle-based protein delivery systems for biomedical applications
Promotor: A. Kros
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Parkinson Protein α-Synuclein Binds Surprisingly Strong with Membrane
Α-synuclein, a protein associated with Parkinson’s disease, proves to bind with membranes in a surprisingly efficient way. It confirms scientists’ suspicion of the protein’s leading role in the transmission of neurotransmitters between nerve cells in the brain. Publication in PLoS ONE.
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The advantages and disadvantages of bioorthogonal proteins
This thesis describes the use of bioorthogonal proteins in immunological settings. It provides an introduction towards the field of protein modification, which was used throughout the thesis for the expression of proteins containing unnatural amino acids.
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Spin-label EPR Approaches to Protein Interactions
Promotor: Prof.dr. E.J.J. Groenen
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Unravelling proteins by touch
How can we develop a new microscope that can distinguish individual atoms in proteins?
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Protein condensates as Materials
We have recently discovered that there are biological proteins that phase separate out of solution much the way oil will de-mix from water (see movie). These form dense, liquid-like phases called protein condensates.
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Major European subsidy for membrane fusion
The European Research Council (ERC) has awarded chemist Dr Alexander Kros a Starting Independent Researcher Grant of 1.4 million euro. He will be using the grant to study how molecules penetrate the natural barrier of a cell membrane. If his research is successful, it will in time bring about a revolution…
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Covalent inhibitors of G protein-coupled receptors: the case of adenosine receptors
Supervisor: Xue Yang
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Morphogenesis and protein production in Aspergillus niger
Promotor: Prof.dr. C.A.M.J.J. van den Hondel, Dr. ir. V. Meyer, Co-promotor: Dr. A.F.J. Ram
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Giant unilamellar vesicles: An efficient membrane biophysical tool and its application in drug delivery studies
Promotor: A. Kros
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Oxidation of Therapeutic Proteins and Peptides: Structural and Biological Consequences
Oxidation is a common degradation pathway that affects therapeutic proteins and peptides during production, purification, formulation, transportation, storage and handling of solid and liquid preparations. In the present work we review the scientific literature about structural and biological consequences…
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Immunoproteomic Profiling of Bordetella pertussis Outer Membrane Vesicle Vaccine Reveals Broad and Balanced Humoral Immunogenicity
The current resurgence of whooping cough is alarming, and improved pertussis vaccines are thought to offer a solution. Outer membrane vesicle vaccines (omvPV) are potential vaccine candidates, but omvPV-induced humoral responses have not yet been characterized in detail.
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Nanoparticle – redox protein biohybrids
Artificial photosynthesis aims to produce fuels from solar energy using chemical processes. In semi-artificial photosynthesis, a hybrid approach is taken using both chemical and biotechnology approaches. We aim to develop hybrid systems between light-harvesting nanoparticles and redox-enzymes (oxidoreductases)…
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Protein condensates and fiber formation
Some species of proteins which can form liquid-like condensates, also exhibit growth into fibers (or fibrils). One particularly interesting set of such proteins are those that are associated with neurodegeneration in which the fiber growth may be related to the pathological fibrils observed in disea…
- Martina Huber Lab (EPR Group)
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NMR studies of protein-small molecule and protein-peptide interactions
Promotor: M. Ubbink, Co-promotor: G. Siegal
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Structure and regulation in photosynthesis
Plants, algae and cyanobacteria have the amazing capacity to perform delicate photophysical and photochemical processes of light capture, excitation transfer, charge separation and catalysis in fluctuating living environments. As a consequence, photosynthetic proteins and membranes form dynamic architectures.…
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Regulation of the arabidopsis AGC kinase PINOID by PDK1 and the microtubule cytoskeleton
Plants, are sessile organisms, have developed strategies to adapt to changes in their environment, in part by altering their growth and development.
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Synthetic modification of fusogenic coiled-coil peptides
A structural investigation of coiled coil peptides used as membrane fusogens, mimicing naturally occuring coiled-coil fusion proteins. Synthetic modifications have been made to alter lipid attachment, secondary structure and to insert photoactive azobenzene moieties for active control over coiled coil…
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NMR structural studies of protein-small molecule interactions
Promotor: M. Ubbink, Co-promotor: G. Siegal
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The good? The bad? The mutant! Characterization of cancer-related somatic mutations and identification of a selectivity hotspot in adenosine
G protein-coupled receptors (GPCRs), one of the largest families of membrane proteins, are responsive to a diverse set of physiological endogenous ligands including hormones and neurotransmitters.
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Molecular engineering of plant development using Agrobacterium-mediated protein translocation
Supervisor: P.J.J. Hooykaas Co-Supervisor: R. Offringa
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Pharmaceutical Aspects of Subvisible Particles in Protein Formulations
Promotor: W. Jiskoot, Co-promotor: A. Hawe
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chain length distribution on the barrier properties of the skin lipid membranes
The skin barrier function is provided by the stratum corneum (SC). The lipids in the SC are composed of three lipid classes: ceramides (CERs), cholesterol (CHOL) and free fatty acids (FFAs) which form two crystalline lamellar structures. In the present study, we investigate the effect of CER chain length…
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Activity-based protein profiling of diacylglycerol lipases
Promotor: H.S. Overkleeft, Co-promotor: M. van der Stelt
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Teaching
Research projects for students of the University of Leiden and other Dutch Universities are often available at the MacBio group. The research lines are also described in the Research section. For details of specific projects contact the supervisor (Ubbink, Dame, Boyle, Jeuken or Wentink).
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specific antibiotics against Gram-negative bacteria through outer membrane disruption
Extending our current arsenal of antibiotics is key to staying ahead in the arms race between humans and resistant bacteria.
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Visualization of effector protein translocation from Agrobacterium tumefaciens into host cells
In our research protein translocation from Agrobacterium into yeast and plant cells is studied to obtain fundamental insights in the translocation process
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Activity-based protein profiling in drug discovery
In the last decades, activity-based protein profiling (ABPP) has emerged as a powerful chemical tool that may aid the ever-challenging drug discovery process.
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Zipping into Fusion
Promotor: J.G.E.M.Fraaije, Co-promotor: A. Kros
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Fluorescence Polarization Activity-Based Protein Profiling on Retaining Glycosidases
Glycosidases are important enzymes in the turnover of polysaccharides and glycoconjugates, and are involved in a range of human pathologies including genetic disorders such as Gaucher and Pompe disease, but also in various cancers.
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solvent free supercritical fluid spray drying process for producing dry protein formulations
In this study, we evaluated the influence of supercritical carbon dioxide (scCO2) spray drying conditions, in the absence of organic solvent, on the ability to produce dry protein/trehalose formulations at 1:10 and 1:4 (w/w) ratios.
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Protein motions revealed by paramagnetic NMR spectroscopy
Hass
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CRISPR Cas-induced targeted mutagenesis with Agrobacterium mediated protein delivery
The RNA guided endonuclease based on the CRISPR/Cas system of Streptococcus pyogenus is a potent new tool for genome engineering in plants.
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Coiled-coil mediated liposomal fusion: Asymmetric behaving peptide fusogens
Membrane fusion is a vital process in living organisms and is mediated by zipper-like proteins.
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Identification and characterization of small molecule inhibitors of type VII protein secretion systems (1.0 fte)
Science, Leiden Institute of Chemistry (LIC)
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Lipid model membrane systems as a tool for unraveling the underlying factors for skin barrier dysfunction
Barrier function is the natural role of the skin. The lipid matrix present in the outermost layer of the skin, the stratum corneum is important for this function.
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Understanding membrane fusion at the molecular level using a biomimetic model system
How can the transport of molecules in living cells help to target medicines at exactly the right place?