Three-dimensional nanometry of vesicle transport in living cells using dual-focus imaging optics

Tomonobu M. Watanabe, Takashi Sato, Kohsuke Gonda, Hideo Higuchi

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Dual-focus imaging optics for three-dimensional tracking of individual quantum dots has been developed to study the molecular mechanisms of motor proteins in cells. The new system has a high spatial and temporal precision, 2 nm in the x-y sample plane and 5 nm along the z-axis at a frame time of 2 ms. Three-dimensional positions of the vesicles labeled with quantum dots were detected in living cells. Vesicles were transported on the microtubules using 8-nm steps towards the nucleus. The steps had fluctuation of ∼20 nm which were perpendicular to the axis of the microtubule but with the constant distance from the microtubule. The most of perpendicular movement was not synchronized with the 8-nm steps, indicating that dynein moved on microtubules without changing the protofilaments. When the vesicles changed their direction of movement toward the cell membrane, they moved perpendicular with the constant distance from the microtubule. The present method is powerful tool to investigate three dimensional movement of molecules in cells with nanometer and millisecond accuracy.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalBiochemical and biophysical research communications
Volume359
Issue number1
DOIs
Publication statusPublished - 2007 Jul 20

Keywords

  • 3D
  • Dynein
  • Kinesin
  • Nanotechnology
  • Step size

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

Fingerprint Dive into the research topics of 'Three-dimensional nanometry of vesicle transport in living cells using dual-focus imaging optics'. Together they form a unique fingerprint.

  • Cite this