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Multiplexed parallel single transport recordings on nanopore arrays
Alexander Kleefen1, Daniel Pedone, Christian Grunwald
1Institute of Biochemistry, Biocenter, Center for Membrane Proteomics (CMP), and Cluster of Excellence Frankfurt (CEF)-Macromolecular Complexes, Goethe-University Frankfurt, Max-von-Laue-Strasse 9, D-60438 Frankfurt/M., Germany.
Nano Letters
|October 29, 2010
Summary
We developed a silicon chip for analyzing membrane transport proteins in lipid membranes without surface modification. This chip enables simultaneous observation of over 1,000 single transmembrane events using fluorescence monitoring.
Area of Science:
- Biophysics
- Nanotechnology
- Analytical Chemistry
Background:
- Membrane proteins, including channels and transporters, are crucial for cellular functions.
- Analyzing these proteins in lipid bilayers is essential for understanding biological processes and drug development.
- Current methods often require surface modification or organic solvents, limiting throughput and native-state analysis.
Purpose of the Study:
- To introduce a novel nanofabricated silicon chip for high-throughput, label-free analysis of membrane protein activity.
- To enable the study of transmembrane transport in suspended lipid membranes without organic solvents.
- To monitor single membrane complex translocation kinetics via fluorescence.
Main Methods:
- Fabrication of a silicon chip with an array of nanopores, each forming a pyramidal back-reflecting compartment (30 fL).
- Incorporation of suspended lipid membranes across the nanopores.
- Single-molecule fluorescence detection to monitor transport events through individual membrane complexes.
- Massively multiplexed analysis of approximately 1,000 simultaneous single transmembrane events.
Main Results:
- Demonstration of a nanofabricated chip enabling massively multiplexed analysis of membrane channels and transporters.
- Successful monitoring of transport processes through single membrane complexes in suspended lipid membranes.
- Simultaneous observation of ~1,000 single transmembrane events in a single field of view.
- Acquisition of translocation kinetics data for transmembrane complexes.
Conclusions:
- The developed silicon chip offers a powerful platform for high-throughput analysis of membrane protein function.
- This method eliminates the need for surface modification and organic solvents, preserving the native environment of membrane proteins.
- The chip facilitates detailed kinetic studies of individual transmembrane transport events, advancing membrane biophysics research.
