Direct PIP2 binding mediates stable oligomer formation of the serotonin transporter

Andreas Anderluh, Tina Hofmaier, Enrico Klotzsch, Oliver Kudlacek, Thomas Stockner, Harald H. Sitte () and Gerhard J. Schütz ()
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Andreas Anderluh: Institute of Applied Physics, TU Wien
Tina Hofmaier: Center for Physiology and Pharmacology, Institute of Pharmacology, Medical University Vienna
Enrico Klotzsch: EMBL Australia Node in Single Molecule Science, School of Medical Sciences, ARC Centre of Excellence in Advanced Molecular Imaging, University of New South Wales
Oliver Kudlacek: Center for Physiology and Pharmacology, Institute of Pharmacology, Medical University Vienna
Thomas Stockner: Center for Physiology and Pharmacology, Institute of Pharmacology, Medical University Vienna
Harald H. Sitte: Center for Physiology and Pharmacology, Institute of Pharmacology, Medical University Vienna
Gerhard J. Schütz: Institute of Applied Physics, TU Wien

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract The human serotonin transporter (hSERT) mediates uptake of serotonin from the synaptic cleft and thereby terminates serotonergic signalling. We have previously found by single-molecule microscopy that SERT forms stable higher-order oligomers of differing stoichiometry at the plasma membrane of living cells. Here, we report that SERT oligomer assembly at the endoplasmic reticulum (ER) membrane follows a dynamic equilibration process, characterized by rapid exchange of subunits between different oligomers, and by a concentration dependence of the degree of oligomerization. After trafficking to the plasma membrane, however, the SERT stoichiometry is fixed. Stabilization of the oligomeric SERT complexes is mediated by the direct binding to phosphoinositide phosphatidylinositol-4,5-biphosphate (PIP2). The observed spatial decoupling of oligomer formation from the site of oligomer operation provides cells with the ability to define protein quaternary structures independent of protein density at the cell surface.

Date: 2017
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DOI: 10.1038/ncomms14089

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