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Related Experiment Videos

Cargo-binding makes a wild-type single-headed myosin-VI move processively.

Mitsuhiro Iwaki1, Hiroto Tanaka, Atsuko Hikikoshi Iwane

  • 1Department of Biophysical Engineering, Osaka University, Suita, Osaka, Japan.

Biophysical Journal
|February 28, 2006
PubMed
Summary

Single-headed myosin VI, a motor protein, moves processively when attached to cargo like beads. This cargo-assisted movement differs from dimer-driven transport and may involve multiple motors for long-distance cellular transport.

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Area of Science:

  • Cell Biology
  • Molecular Motors
  • Biophysics

Background:

  • Class VI myosin is an intracellular transporter moving along actin filaments.
  • Myosin VI was expected to be a dimer for processive movement.
  • Recent findings suggest wild-type myosin VI is monomeric and single-headed, questioning its processivity.

Purpose of the Study:

  • To investigate the processivity of single-headed, wild-type myosin VI.
  • To determine if myosin VI can move processively when attached to cargo.
  • To compare monomer-driven and dimer-driven myosin VI movement.

Main Methods:

  • Single molecule techniques were employed.
  • Green-fluorescent-protein-tagged, single-headed myosin VI was used.
  • Myosin VI was coupled to 200-nm polystyrene beads to mimic intracellular vesicles.

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Main Results:

  • Single-headed myosin VI alone did not move processively.
  • Monomer-bead complexes moved processively with large steps (40 nm).
  • Monomer-driven movement showed reduced stall force, shorter run length, and load-dependent steps compared to artificial dimers.
  • Processivity increased in high viscosity solutions, suggesting a diffusional anchor effect by the bead.

Conclusions:

  • A single-headed myosin VI can achieve processive movement when attached to a large cargo.
  • The bead acts as a diffusional anchor, enhancing myosin VI rebinding and processivity.
  • Multiple myosin VI molecules may collaborate for long-distance cargo transport in cells.