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Toward Single-Cell Single-Molecule Pull-Down.

Xuefeng Wang1, Seongjin Park2, Lanying Zeng3

  • 1Department of Physics and Astronomy, Iowa State University, Ames, Iowa; Department of Physics, Center for the Physics of Living Cells and Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois.

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|May 29, 2018
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Summary
This summary is machine-generated.

We developed a novel single-cell analysis method to capture proteins directly from individual bacterial cells. This technique enables the study of protein complex variations at the single-cell level, advancing biomolecular research.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Single-molecule pull-down (SiMPull) analyzes protein complexes from cell lysates.
  • Current SiMPull methods require numerous cells, limiting single-cell variation studies.

Purpose of the Study:

  • To develop a single-cell SiMPull protocol for analyzing protein complex variations.
  • To enable high-throughput protein and protein-protein interaction analysis at the single-cell level.

Main Methods:

  • Developed an in situ lysis protocol for bacterial cells.
  • Utilized lysozymes for controlled protein release and a 10-μm spacer for reduced capture radius.
  • Captured released proteins on an imaging surface using antibodies for single-molecule imaging.

Main Results:

  • Successfully lysed bacterial cells in situ and captured released proteins.
  • Achieved a capture radius below 30 μm for approximately 70% of target proteins.
  • Enabled unambiguous assignment of captured proteins to their originating cell.

Conclusions:

  • The developed protocol allows for single-cell protein complex analysis.
  • This method facilitates the investigation of cell-to-cell variations in biomolecular complex stoichiometry and activity.
  • The platform supports high-throughput single-cell protein and interaction analysis.