Publication Date:
2011-10-25
Description:
Neuronal exocytosis is catalysed by the SNAP receptor protein syntaxin-1A, which is clustered in the plasma membrane at sites where synaptic vesicles undergo exocytosis. However, how syntaxin-1A is sequestered is unknown. Here we show that syntaxin clustering is mediated by electrostatic interactions with the strongly anionic lipid phosphatidylinositol-4,5-bisphosphate (PIP2). Using super-resolution stimulated-emission depletion microscopy on the plasma membranes of PC12 cells, we found that PIP2 is the dominant inner-leaflet lipid in microdomains about 73 nanometres in size. This high accumulation of PIP2 was required for syntaxin-1A sequestering, as destruction of PIP2 by the phosphatase synaptojanin-1 reduced syntaxin-1A clustering. Furthermore, co-reconstitution of PIP2 and the carboxy-terminal part of syntaxin-1A in artificial giant unilamellar vesicles resulted in segregation of PIP2 and syntaxin-1A into distinct domains even when cholesterol was absent. Our results demonstrate that electrostatic protein-lipid interactions can result in the formation of microdomains independently of cholesterol or lipid phases.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3409895/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3409895/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉van den Bogaart, Geert -- Meyenberg, Karsten -- Risselada, H Jelger -- Amin, Hayder -- Willig, Katrin I -- Hubrich, Barbara E -- Dier, Markus -- Hell, Stefan W -- Grubmuller, Helmut -- Diederichsen, Ulf -- Jahn, Reinhard -- P01 GM072694/GM/NIGMS NIH HHS/ -- England -- Nature. 2011 Oct 23;479(7374):552-5. doi: 10.1038/nature10545.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Gottingen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22020284" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
Cholesterol
;
Membrane Microdomains/*chemistry/metabolism
;
Microscopy, Confocal
;
Molecular Dynamics Simulation
;
Nerve Tissue Proteins/metabolism
;
PC12 Cells
;
Phosphatidylinositol 4,5-Diphosphate/*chemistry/*metabolism
;
Phosphoric Monoester Hydrolases/metabolism
;
*Protein Binding
;
Rats
;
*Static Electricity
;
Syntaxin 1/*chemistry/*metabolism
;
Unilamellar Liposomes/chemistry/metabolism
Print ISSN:
0028-0836
Electronic ISSN:
1476-4687
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
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