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Journal Article

Cis- and trans-membrane interactions of synaptotagmin-1.

MPS-Authors
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Vennekate,  W.
Research Group of Biomolecular Spectroscopy and Single-Molecule Detection, MPI for biophysical chemistry, Max Planck Society;

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Schröder,  S.
Research Group of Biomolecular Spectroscopy and Single-Molecule Detection, MPI for biophysical chemistry, Max Planck Society;

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Lin,  C. C.
Research Group of Biomolecular Spectroscopy and Single-Molecule Detection, MPI for biophysical chemistry, Max Planck Society;

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van den Bogaart,  G.
Department of Neurobiology, MPI for biophysical chemistry, Max Planck Society;

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Grunwald,  M.
Department of Neurobiology, MPI for biophysical chemistry, Max Planck Society;

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Jahn,  R.
Department of Neurobiology, MPI for biophysical chemistry, Max Planck Society;

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Walla,  P. J.
Research Group of Biomolecular Spectroscopy and Single-Molecule Detection, MPI for biophysical chemistry, Max Planck Society;

Fulltext (public)

1481317.pdf
(Publisher version), 2MB

Supplementary Material (public)

1481317_Supplement_1.pdf
(Supplementary material), 672KB

Citation

Vennekate, W., Schröder, S., Lin, C. C., van den Bogaart, G., Grunwald, M., Jahn, R., et al. (2012). Cis- and trans-membrane interactions of synaptotagmin-1. Proceedings of the National Academy of Siences of the United States of America, 109(27), 11037-11042. doi:10.1073/pnas.1116326109.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-A5A0-1
Abstract
In neurotransmission synaptotagmin-1 tethers synaptic vesicles to the presynaptic plasma membrane by binding to acidic membrane lipids and SNAREs and promotes rapid SNARE-mediated fusion upon Ca2+ triggering. However, recent studies suggested that upon membrane contact synaptotagmin may not only bind in trans to the target membrane but also in cis to its own membrane. Using a sensitive membrane tethering assay we have now dissected the structural requirements and concentration ranges for Ca2+-dependent and -independent cis-binding and trans-tethering in the presence and absence of acidic phospholipids and SNAREs. Using variants of membrane-anchored synaptotagmin in which the Ca2+-binding sites in the C2 domains and a basic cluster involved in membrane binding were disrupted we show that Ca2+-dependent cis-binding prevents trans-interactions if the cis-membrane contains 12–20% anionic phospholipids. Similarly, no trans-interactions were observable using soluble C2AB-domain fragments at comparable concentrations. At saturating concentrations, however, tethering was observed with soluble C2AB domains, probably due to crowding on the vesicle surface and competition for binding sites. We conclude that trans-interactions of synaptotagmin considered to be essential for its function are controlled by a delicate balance between cis- and trans-binding, which may play an important modulatory role in synaptic transmission.