Dresden 2017 – scientific programme

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BP: Fachverband Biologische Physik

BP 21: Posters - Membranes and Vesicles

BP 21.12: Poster

Tuesday, March 21, 2017, 14:00–16:00, P1A

Detachment of membrane bound virions by competitive ligand-binding induced receptor depletion — •Nagma Parveen¹, Stephan Block², Vladimir Zhdanov^1,4, Gustaf Rydell³, and Fredrik Höök¹ — ¹Department of Physics, Chalmers University of Technology, Gothenburg, Sweden — ²Department of Chemistry and Biochemistry, Freie Universität Berlin, Berlin, Germany — ³Department of Infectious Diseases, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden — ⁴Boreskov Institute of Catalysis, Russian Academy of Sciences, Novosibirsk, Russia

Multivalent interactions between virions and receptors in a lipid membrane can be weakened using competitive non-pathogenic ligand binding. In particular, the subsequent binding of such ligands can induce detachment of bound virions, a phenomena of crucial relevance for the development of new antiviral drugs. Focusing on the simian virus 40 (SV40) and recombinant cholera toxin B subunit (rCTB), and using (monosialotetrahexosyl)ganglioside (GM1) as their common receptor in a supported lipid bilayer (SLB), we present the first detailed investigation of this phenomenon by employing the quartz crystal microbalance with dissipation (QCM-D) and 2D single particle tracking (SPT) techniques. Analysis of the QCM-D-tracked release kinetics made it possible to determine the binding strength of a single SV40-GM1 pair. The release dynamics of SV40, monitored by SPT, revealed that a notable fraction of SV40 become mobile just before the release, allowing to estimate the distribution of SV40-bound GM1 receptors just prior to release.