Single-Molecule Detection with Lightguiding Nanowires : Determination of Protein Concentration and Diffusivity in Supported Lipid Bilayers
Verardo, Damiano LU ; Agnarsson, Björn ; Zhdanov, Vladimir P. ; Höök, Fredrik LU and Linke, Heiner LU
(2019)
In Nano Letters
19(9).
p.6182-6191
- Abstract
Determining the surface concentration and diffusivity of cell-membrane-bound molecules is central to the understanding of numerous important biochemical processes taking place at cell membranes. Here we use the high aspect ratio and lightguiding properties of semiconductor nanowires (NWs) to detect the presence of single freely diffusing proteins bound to a lipid bilayer covering the NW surface. Simultaneous observation of light-emission dynamics of hundreds of individual NWs occurring on the time scale of only a few seconds is interpreted using analytical models and employed to determine both surface concentration and diffusivity of cholera toxin subunit B (CTxB) bound to GM1 gangliosides in supported lipid bilayer (SLB) at surface... (More)
Determining the surface concentration and diffusivity of cell-membrane-bound molecules is central to the understanding of numerous important biochemical processes taking place at cell membranes. Here we use the high aspect ratio and lightguiding properties of semiconductor nanowires (NWs) to detect the presence of single freely diffusing proteins bound to a lipid bilayer covering the NW surface. Simultaneous observation of light-emission dynamics of hundreds of individual NWs occurring on the time scale of only a few seconds is interpreted using analytical models and employed to determine both surface concentration and diffusivity of cholera toxin subunit B (CTxB) bound to GM1 gangliosides in supported lipid bilayer (SLB) at surface concentrations down to below one CTxB per μm2. In particular, a decrease in diffusivity was observed with increasing GM1 content in the SLB, suggesting increasing multivalent binding of CTxB to GM1. The lightguiding capability of the NWs makes the method compatible with conventional epifluorescence microscopy, and it is shown to work well for both photostable and photosensitive dyes. These features make the concept an interesting complement to existing techniques for studying the diffusivity of low-abundance cell-membrane-bound molecules, expanding the rapidly growing use of semiconductor NWs in various bioanalytical sensor applications and live cell studies.
(Less)
- author
- Verardo, Damiano
LU
; Agnarsson, Björn
; Zhdanov, Vladimir P.
; Höök, Fredrik
LU
and Linke, Heiner
LU
- organization
- publishing date
- 2019
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Biosensing, diffusivity, microscopy, nanowires, single molecule, supported lipid bilayer, waveguide
- in
- Nano Letters
- volume
- 19
- issue
- 9
- pages
- 6182 - 6191
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- pmid:31369284
- scopus:85071501063
- ISSN
- 1530-6984
- DOI
- 10.1021/acs.nanolett.9b02226
- language
- English
- LU publication?
- yes
- id
- fbe721c0-1ae3-446c-9920-6b1208143049
- date added to LUP
- 2019-09-17 13:36:59
- date last changed
- 2024-06-12 01:11:32
@article{fbe721c0-1ae3-446c-9920-6b1208143049,
abstract = {{<p>Determining the surface concentration and diffusivity of cell-membrane-bound molecules is central to the understanding of numerous important biochemical processes taking place at cell membranes. Here we use the high aspect ratio and lightguiding properties of semiconductor nanowires (NWs) to detect the presence of single freely diffusing proteins bound to a lipid bilayer covering the NW surface. Simultaneous observation of light-emission dynamics of hundreds of individual NWs occurring on the time scale of only a few seconds is interpreted using analytical models and employed to determine both surface concentration and diffusivity of cholera toxin subunit B (CTxB) bound to GM1 gangliosides in supported lipid bilayer (SLB) at surface concentrations down to below one CTxB per μm<sup>2</sup>. In particular, a decrease in diffusivity was observed with increasing GM1 content in the SLB, suggesting increasing multivalent binding of CTxB to GM1. The lightguiding capability of the NWs makes the method compatible with conventional epifluorescence microscopy, and it is shown to work well for both photostable and photosensitive dyes. These features make the concept an interesting complement to existing techniques for studying the diffusivity of low-abundance cell-membrane-bound molecules, expanding the rapidly growing use of semiconductor NWs in various bioanalytical sensor applications and live cell studies.</p>}},
author = {{Verardo, Damiano and Agnarsson, Björn and Zhdanov, Vladimir P. and Höök, Fredrik and Linke, Heiner}},
issn = {{1530-6984}},
keywords = {{Biosensing; diffusivity; microscopy; nanowires; single molecule; supported lipid bilayer; waveguide}},
language = {{eng}},
number = {{9}},
pages = {{6182--6191}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Nano Letters}},
title = {{Single-Molecule Detection with Lightguiding Nanowires : Determination of Protein Concentration and Diffusivity in Supported Lipid Bilayers}},
url = {{http://dx.doi.org/10.1021/acs.nanolett.9b02226}},
doi = {{10.1021/acs.nanolett.9b02226}},
volume = {{19}},
year = {{2019}},
}