1. Reversible Photocontrolled Nanopore Assembly
- Author
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Ben L. Feringa, Wiktor Szymanski, Natalie Lisa Mutter, Giovanni Maglia, Jana Volarić, Chemical Biology 1, Synthetic Organic Chemistry, and Basic and Translational Research and Imaging Methodology Development in Groningen (BRIDGE)
- Subjects
PORE-FORMING TOXIN ,Lysis ,GLUTAMATE-RECEPTOR ,PROTEIN ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Catalysis ,Article ,AZOBENZENE PHOTOSWITCHES ,Cell membrane ,chemistry.chemical_compound ,Nanopores ,Colloid and Surface Chemistry ,Cnidarian Venoms ,PHOTOCHEMICAL CONTROL ,SEA-ANEMONE ,medicine ,ION CHANNELS ,Nanotechnology ,OPTICAL CONTROL ,PEPTIDE ,Ion channel ,Pore-forming toxin ,Molecular Structure ,EQUINATOXIN-II ,Chemistry ,Biological membrane ,Stereoisomerism ,General Chemistry ,Photochemical Processes ,0104 chemical sciences ,Nanopore ,medicine.anatomical_structure ,Membrane ,Azobenzene ,Biophysics - Abstract
Self-assembly is a fundamental feature of biological systems, and control of such processes offers fascinating opportunities to regulate function. Fragaceatoxin C (FraC) is a toxin that upon binding to the surface of sphingomyelin-rich cells undergoes a structural metamorphosis, leading to the assembly of nanopores at the cell membrane and causing cell death. In this study we attached photoswitchable azobenzene pendants to various locations near the sphingomyelin binding pocket of FraC with the aim of remote controlling the nanopore assembly using light. We found several constructs in which the affinity of the toxin for biological membranes could be activated or deactivated by irradiation, thus enabling reversible photocontrol of pore formation. Notably, one construct was completely inactive in the thermally adapted state; it however induced full lysis of cultured cancer cells upon light irradiation. Selective irradiation also allowed isolation of individual nanopores in artificial lipid membranes. Photocontrolled FraC might find applications in photopharmacology for cancer therapeutics and has potential to be used for the fabrication of nanopore arrays in nanopore sensing devices, where the reconstitution, with high spatiotemporal precision, of single nanopores must be controlled.
- Published
- 2019