Document Detail


FCS in STED Microscopy: Studying the Nanoscale of Lipid Membrane Dynamics.
MedLine Citation:
PMID:  23280106     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Details of molecular membrane dynamics in living cells such as lipid-protein interactions or the incorporation of molecules into lipid "rafts" are often hidden to the observer because of the limited spatial resolution of conventional far-field optical microscopy. Fortunately, the superior spatial resolution of far-field stimulated-emission-depletion (STED) nanoscopy allows gaining new insights. Applying fluorescence correlation spectroscopy (FCS) in focal spots continuously tuned down to 30nm in diameter distinguishes free from anomalous molecular diffusion due to transient binding, as for the diffusion of fluorescent phosphoglycero- and sphingolipid analogs in the plasma membrane of living cells. STED-FCS data recorded at different environmental conditions and on different lipid analogs reveal molecular details of the observed nanoscale trapping. Dependencies on the molecular structure of the lipids point to the distinct connectivity of the various lipids to initiate or assist cellular signaling events, but also outline strong differences to the characteristics of liquid-ordered and disordered phase separation in model membranes. STED-FCS is a highly sensitive and exceptional tool to study the membrane organization by introducing a new class of nanoscale biomolecular studies.
Authors:
Veronika Mueller; Alf Honigmann; Christian Ringemann; Rebecca Medda; Günter Schwarzmann; Christian Eggeling
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Methods in enzymology     Volume:  519     ISSN:  1557-7988     ISO Abbreviation:  Meth. Enzymol.     Publication Date:  2013  
Date Detail:
Created Date:  2013-01-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0212271     Medline TA:  Methods Enzymol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1-38     Citation Subset:  IM    
Copyright Information:
Copyright © 2013 Elsevier Inc. All rights reserved.
Affiliation:
Department of Nanobiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.
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