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Related Experiment Videos

Myosins from plants.

K Yamamoto1, S Hamada, T Kashiyama

  • 1Department of Biology, Faculty of Science, Chiba University, Japan. yamamoto@bio.s.chiba-u.ac.jp

Cellular and Molecular Life Sciences : CMLS
|February 24, 2001
PubMed
Summary
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Plant unconventional myosins share structural similarities with class V myosins, featuring a two-headed structure and a tail piece likely involved in membrane interaction. Characean myosin exhibits rapid actin filament translocation, faster than muscle myosin.

Area of Science:

  • Plant molecular biology
  • Cellular motility
  • Biochemistry

Background:

  • Unconventional myosins are crucial motor proteins involved in various cellular processes.
  • Understanding plant myosin structure and function provides insights into cytoskeletal dynamics.
  • Class V myosins are known for their processive movement along actin filaments.

Purpose of the Study:

  • To investigate the structure and sequence of plant unconventional myosins.
  • To compare plant myosins with known myosin classes, particularly class V.
  • To analyze the functional properties of characean myosin.

Main Methods:

  • Molecular cloning and sequence analysis of myosin genes from Arabidopsis thaliana.
  • Electron microscopic observation of characean algal myosin.

Related Experiment Videos

  • Biophysical characterization of actin filament translocation by characean myosin.

    • Main Results:

    • Plant unconventional myosins exhibit structural homology to class V myosins, possessing two heads and a variable-length coiled-coil tail with a globular tail piece.
    • The globular tail piece is hypothesized to be involved in membrane interaction.
    • Characean myosin demonstrates significantly faster actin filament translocation velocities compared to muscle myosin.

    Conclusions:

    • Plant unconventional myosins are structurally conserved and resemble class V myosins.
    • The unique structural features of plant myosins, including the tail piece, may mediate specific cellular functions like membrane transport.
    • The high velocity of characean myosin suggests specialized roles in plant cellular dynamics, potentially related to rapid intracellular transport.