We report the synthesis and assembly of umbrella-rotaxanes with transmembrane transport properties. We describe their amphomorphism and validate their ability to penetrate and cross phospholipid bilayers. Furthermore we present the strategy to release the macrocyclic compound by enzymatic cleavage inside egg yolk phosphatidylcholine (EYPC) liposomes.
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http://dx.doi.org/10.1039/c3ob41209a | DOI Listing |
Proc Natl Acad Sci U S A
January 2025
Yusuf Hamied Department of Chemistry, Centre for Misfolding Diseases, University of Cambridge, Cambridge CB2 1EW, United Kingdom.
The onset and development of Alzheimer's disease is linked to the accumulation of pathological aggregates formed from the normally monomeric amyloid-β peptide within the central nervous system. These Aβ aggregates are increasingly successfully targeted with clinical therapies at later stages of the disease, but the fundamental molecular steps in early stage disease that trigger the initial nucleation event leading to the conversion of monomeric Aβ peptide into pathological aggregates remain unknown. Here, we show that the Aβ peptide can form biomolecular condensates on lipid bilayers both in molecular assays and in living cells.
View Article and Find Full Text PDFFront Mol Biosci
January 2025
Department of Microbiology, Immunology, and Molecular Genetics, University of Kentucky, Lexington, KY, United States.
This study investigates the dynamics of oleate hydratase (OhyA), a bacterial flavoenzyme from , and its interactions with lipid membranes, focusing on the factors influencing membrane binding and oligomerization. OhyA catalyzes the hydration of unsaturated fatty acids, playing a key role in bacterial pathogenesis by neutralizing host antimicrobial fatty acids. OhyA binds the membrane bilayer to access membrane-embedded substrates for catalysis, and structural studies have revealed that OhyA forms oligomers on membrane surfaces, stabilized by both protein-protein and protein-lipid interactions.
View Article and Find Full Text PDFPLoS One
January 2025
Key Laboratory of Tropical Biological Resources of Ministry of Education, School of Pharmaceutical Sciences, Hainan University, Haikou, China.
Electroporation and electrofusion are efficient methods, which have been widely used in different areas of biotechnology and medicine. Pulse strength and width, as an external condition, play an important role in the process of these methods. However, comparatively little work has been done to explore the effects of pulsed electric field parameters on electroporation and electrofusion.
View Article and Find Full Text PDFBiophys Rev
December 2024
Laboratorio de BioNanotecnología, Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Bernal, Buenos Aires, Argentina.
Synthetic lipids have been studied as components in membrane models and drug delivery systems. Polymerizable phospholipids, especially photosensitive ones, can form new bilayer bonds when UV light irradiates. These phospholipids have been known since the 1980s, but in the last few years, new applications have been highlighted.
View Article and Find Full Text PDFα-Synuclein (αSyn), an intrinsically disordered protein implicated in Parkinson's disease, is potentially thought to initiate aggregation through binding to cellular membranes. Previous studies have suggested that anionic membrane charge is necessary for this binding. However, these studies largely focus on unmodified αSyn, while nearly all αSyn in the body is N-terminally acetylated (NTA).
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