Live-cell single-molecule labeling and analysis of myosin motors with quantum dots

Hiroyasu Hatakeyama, Yoshihito Nakahata, Hirokazu Yarimizu, Makoto Kanzaki

研究成果: Article査読

13 被引用数 (Scopus)


Quantum dots (QDs) are a powerful tool for quantitatively analyzing dynamic cellular processes by single-particle tracking. However, tracking of intracellular molecules with QDs is limited by their inability to penetrate the plasma membrane and bind to specific molecules of interest. Although several techniques for overcoming these problems have been proposed, they are either complicated or inconvenient. To address this issue, in this study, we developed a simple, convenient, and nontoxic method for labeling intracellular molecules in cells using HaloTag technology and electroporation. We labeled intracellular myosin motors with this approach and tracked their movement within cells. By simultaneously imaging myosin movement and F-actin architecture, we observed that F-actin serves not only as a rail but also as a barrier for myosin movement. We analyzed the effect of insulin on the movement of several myosin motors, which have been suggested to regulate intracellular trafficking of the insulin-responsive glucose transporter GLUT4, but found no significant enhancement in myosin motor motility as a result of insulin treatment. Our approach expands the repertoire of proteins for which intracellular dynamics can be analyzed at the single-molecule level.

ジャーナルMolecular biology of the cell
出版ステータスPublished - 2017 1 1

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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