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Originally published as Biophys J. BioFAST on April 8, 2005.
doi:10.1529/biophysj.105.061937
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Biophysical Journal 88:L43-L45 (2005)
© 2005 The Biophysical Society

High Spatial Resolution Observation of Single-Molecule Dynamics in Living Cell Membranes

Joshua B. Edel *, Min Wu {dagger}, Barbara Baird {dagger} and Harold G. Craighead *

* School of Applied and Engineering Physics, and {dagger} Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York

Correspondence: Address reprint requests and inquiries to Harold G. Craighead, Tel.: 607-255-8707; E-mail: hgc1{at}cornell.edu.

Self-organized lipid bilayers together with proteins are the essential building blocks of biological membranes. Membranes are associated with all living systems as they make up cell boundaries and provide basic barriers to cellular organelles. It is of interest to study the dynamics of individual molecules in cell membranes as the mechanism of how biological membranes function at the single molecule remains to be elucidated. In this letter we describe a study in which we incubate rat basophilic leukemia cells with a fluorescently labeled cell membrane component on a surface containing zero-mode waveguides (ZMWs). We used the ZMW to confine fluorescent excitation to an ~100-nm region of the membrane to monitor lipid diffusion along the cellular membrane. We showed that confinement with a ZMW largely reduced fluorescent contributions from the cytosolic pool that is present when using a more standard technique such as laser-induced confocal microscopy. We show that optical confinement with ZMWs is a facile way to probe dynamic processes on the membrane surface.




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