NDLI: Direct observation of brownian motion of lipids in a membrane.

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Two-dimensional life?

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Direct observation of brownian motion of lipids in a membrane.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Jacobson, K. A. Lee, G. M. Ishihara, A.
Description	Author Affiliation: Lee GM ( Department of Cell Biology and Anatomy, University of North Carolina, Chapel Hill 27599-7090.);
Abstract	Nanovid microscopy, which uses 30- to 40-nm colloidal gold probes combined with video-enhanced contrast, can be used to examine random and directed movements of individual molecules in the plasma membrane of living cells. To validate the technique in a model system, the movements of lipid molecules were followed in a supported, planar bilayer containing fluorescein-conjugated phosphatidylethanolamine (Fl-PtdEtn) labeled with 30-nm gold anti-fluorescein (anti-Fl). Multivalent gold probes were prepared by conjugating only anti-Fl to the gold. Paucivalent probes were prepared by mixing an irrelevant antibody with the anti-Fl prior to conjugation. The membrane-bound gold particles moved in random patterns that were indistinguishable from those produced by computer simulations of two-dimensional random motion. The multivalent gold probes had an average lateral diffusion coefficient (D) of 0.26 x 10(-8) cm2/sec, and paucivalent probes had an average D of 0.73 x 10(-8) cm2/sec. Sixteen percent of the multivalent and 50% of the paucivalent probes had values for D in excess of 0.6 x 10(-8) cm2/sec, which, after allowance for stochastic variation, are consistent with the D of 1.3 x 10(-8) cm2/sec measured by fluorescence recovery after photobleaching of Fl-PtdEtn in the planar bilayer. The effect of valency on diffusion suggests that the multivalent gold binds several lipids forming a disk up to 30-40 nm in diameter, resulting in reduced diffusion with respect to the paucivalent gold, which binds one or a very few lipids. Provided the valency of the gold probe is considered in the interpretation of the results. Nanovid microscopy is a valid method for analyzing the movements of single or small groups of molecules within membranes.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	14
Volume Number	88
Language	English
Publisher	National Academy of Sciences
Publisher Date	1991-08-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Cholesterol Chemistry Gold Colloid Liposomes Phosphatidylcholines Antibodies, Monoclonal Fluorescent Dyes Microscopy Models, Biological Phosphatidic Acids Staining And Labeling Video Recording Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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