Within this thesis the central stage is taken by the discovery and investigation of transglycosylation of sterols. First, investigation focuses on the development of a method to accurately detect and quantify glucosylated metabolites in biological materials.

This Thesis describes the synthesis of D-alanylated ribitol-based wall teichoic acids from S. aureus to probe their interaction with immune-binding partners.

Viral diseases constitute one of the major challenges in modern medicine. Membrane-targeting have broad-spectrum potential and could distinguish viral membranes from the host cell plasma membrane by the difference in membrane curvature.

This thesis describes the development of a variety of mannosylated conjugates. Antigen presenting cells bear mannoside recognizing receptors that actively transport antigen into the cell. This thesis exploits this feature for the development of improved vaccines.

Chemische stoffen maken, om biologische vragen mee op te lossen. Wouter van der Linden vat even kort de chemische biologie samen. Daaraan levert hij zijn bijdrage met stoffen die uiteindelijk behulpzaam zijn in de strijd tegen kanker: ‘Dus niet de medicijnen zelf, maar een chemische gereedschapskist…

De chemisch bioloog Herbert Waldmann (Max Planck Institute of Molecular Physiology, Dortmund, Duitsland) krijgt een eredoctoraat van de Universiteit Leiden. Hij krijgt dit voor zijn pionierende werk op het gebied van de chemische biologie en zijn gezaghebbende visie op de rol van dit vakgebied op medicinaal…

Chemici, waaronder Sander van Kasteren en Hermen Overkleeft, hebben ontdekt dat azides, een bepaalde chemische verbinding, specifieke T-cellen kunnen laten reageren op een vaccin of juist het vaccin kunnen laten negeren. Publicatie in Angewandte Chemie.

Anneleen van der Meer bespreekt in diverse media het gebruik van chemische wapens door Rusland.

We use DNA strands to stabilize few-atom silver clusters, which show unique optical and chemical properties. This thesis involves the study of these constructs for various applications.

The inverse electron demand Diels-Alder (IEDDA) pyridazine elimination emerged in 2013 as a new bioorthogonal reaction and constitutes a prime example of what is now known as dissociative bioorthogonal chemistry. The research described in this Thesis aims to develop synthetic strategies which enable…

Overkleeft

Neuraminidases are enzymes that cleave glycosidic linkages of sialic acid. These enzymes are involved in influenza infections as well as in many cellular processes in mammals and micro-organisms.

The work described in this Thesis is focused on the assembly of oligosaccharide fragments derived from a fungal polysaccharide, galactosaminogalactan (GAG) and fragments of the exopolysaccharide Pel, generated by Pseudomonas aeruginosa.

Evolution acts via mutations in amino acid sequences. Substitution of essential amino acids leads to a nonfunctional protein. l.

Cyclic peptides are investigated as a platform to induce different orientations between various ligands.

Nicotinamide adenine dinucleotide (NAD+) is the substrate used for the introduction of the ubiquitous and highly dynamic PTM in which either one or multiple adenosine diphosphate ribose (ADPr) moieties are covalently attached to a nucleophilic side chain of an specific amino acid in the target protein…

Promotor: Prof.dr. M. Ubbink, Co-promotor: G. Siegal

Sander van Kasteren wilde via een simpele chemische aanpassing de werking van het immuunsysteem beter onderzoeken. Wat hij deed was het systeem platleggen. Niet de bedoeling, maar geen nood. De mislukking bracht hem op het spoor van een moleculaire schakelaar. En het leverde een hot paper op.

This thesis describes the development and optimization of the first molecular tools to study the enzyme PLA2G4E.

Dr. Remko Offringa is met ingang van 1 september 2016 benoemd tot Opleidsingsdirecteur van de masteropleiding Biology. Hij volgt daarmee Johan Memelink op.

Trillende koolstofmonoxide moleculen die zich binden aan het oppervlakte van een zoutkristal, stoppen binnen enkele milliseconden met bewegen. Wetenschappers hebben nu ontdekt dat dit voornamelijk komt door de emissie van elektromagnetische golven. De rol van de chemische binding met het oppervlakte…

Mirjam Luijten, toxicoloog bij het RIVM, gaat per 1 juli aan de slag als bijzonder hoogleraar bij het LACDR.

Promotores: H.S. Overkleeft, G.A. van der Marel, Co-promotor: B.I. Florea

Alleen wat kleine, subtiele veranderingen merkt Sander van Kasteren sinds hij per 1 mei werd benoemd tot hoogleraar. Toch moet hij een beetje wennen aan het idee, ook al werkte hij al een paar jaar naar het hoogleraarschap toe. ‘Ik zie mezelf nog niet helemaal als prof.’

Dit proefschrift beschrijft een collectie aan alternatieve strategieën voor het begrijpen, ontwerpen en toepassen van lipide nanosystemen, waarin de rol van de bio-nano interacties centraal staan. In het bijzonder wordt gekeken naar de interactie van RNA-lipide nanosystemen, bekend van de toepassing…

hotocatalysis has emerged as a powerful tool for enabling challenging transformations in organic synthesis. This thesis explores the development of several photocatalytic reactions designed to form carbon-heteroatom bonds from less-functionalized precursors.

This thesis focuses on the design and synthesis of activity-based probes and inhibitors targeting enzymes involved in the degradation of specific plant glycans.

Cytotoxic T-cells (CTLs) are involved in the clearance of viruses and killing of tumor cells.

Promotor: H.S. Overkleeft, Co-promotor: M. van der Stelt

The research presented in this thesis explores the chemotherapeutic potential of metal-based compounds as chemotherapy agents, with an initial focus on the synthesis and DNA interaction studies of platinum and palladium compounds utilizing the [Pt(bapbpy)]2+ scaffold. The study identifies intercalation…

Promotores: Prof.dr. H.S. Overkleeft, Prof.dr. G.A. van der Marel

This thesis describes the use of an activity-based proteomics method to study the endocannabinoid system.

This dissertation contains four works during my PhD. Different biomaterials have been designed based on coiled-coil peptides. These biomaterials have a range of applications, inclusing drug delivery, cell sorting to cell-cell fusion.

The primary goal of this research is to deepen our understanding of substrate-enzyme interactions in Glycoside hydrolases. For this purpose, Bacillus circulans xylanase (BcX) has been selected as a well-established model to examine the Michaelis complex and glycosyl-enzyme adduct.

Promotor: Prof.dr. M. Ubbink

This thesis explores squaramide-based supramolecular polymers and hydrogels, enhancing their mechanical strength for 3D cell culture.

N-acylethanolamines (NAEs), including N-arachidonoylethanolamine (anandamide, AEA), N-palmitoylethanolamine (PEA) and N-oleoylethanolamine (OEA), are signaling lipids that play an important role in different physiological process.

Endocannabinoids are lipid messengers that modulate various physiological functions by activating the cannabinoid CB1 and CB2 receptors. While the metabolism of endocannabinoids and their action at the CB receptors is fairly well studied, the molecular mechanisms governing their release and transport…

The research described in this thesis combines the latest insights in lysosomal function with lysosome centred cell signalling.

Carbohydrates are present on the surface of bacteria making them suitable antigen candidates for vaccine development. This thesis deals with the synthesis of two carbohydrate-based components; the capsular polisaccharide of S. aureus type 5 and teichoic acids from staphilococci and enterococci speci…

This doctoral thesis is an effort to understand how lipid phase-separation induced by diacylglycerol analogues in lipid-based nanoparticles affects their in vivo behavior, leading to specific nanoparticle-protein communications and selective cell targeting.

A new type of tripodal squaramide-based supramolecular hydrogels is developed and studied.

This thesis focused on the exploration of monolayer graphene as a membrane in direct methanol fuel cell (DMFC) applications, with improvements achieved through plasma exposure or damage- free chemical functionalization.

Promotor: Prof.dr. G.A. van der Marel, Co-Promotor: J.D.C. Codée

The main goal of this thesis is to achieve advanced control of binding properties in bis-pyrrolic and macrocyclic pyrrolic receptors by light.

Promotor: Prof.dr. J.P. Abrahams

Prof.dr. Geert de Snoo is per 1 maart bij de Faculteit der Wiskunde en Natuurwetenschappen benoemd tot hoogleraar Conservation Biology. De Snoo blijft hoofd van de gelijknamige afdeling van het Institute of Environmental Sciences (CML).

The deeper understanding of an organism's pathology is important for developing treatments. Over centuries of systematic research, clinical researchers have demonstrated that the more information they acquire about the cellular properties and their organisation in the tissue, the better they can understand…

Ontwikkelingen om de mariene biodiversiteit met hoge resolutie te meten, door ernaar te luisteren.

The first steps are made in personalised cancer vaccination strategies, which aim to induce a more specific immune response with fewer side effects. The activation of cytotoxic T cells is crucial for an effective immune response.