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Phospholipid membrane-associated brush border myosin-I activity

H G Zot1

  • 1Department of Physiology, University of Texas Southwestern Medical Center at Dallas 75235-9040, USA.

Cell Motility and the Cytoskeleton
|January 1, 1995
PubMed
Summary

Brush border myosin-I (BBMI) binds to specific phospholipids but lacks mechanical activity on membranes. Additional factors are likely needed for BBMI

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Motor Function

Background:

  • Brush border myosin-I (BBMI) is found in intestinal epithelial cells, potentially aiding structure and vesicle transport.
  • Its mechanochemical activity when bound to membranes remains largely uncharacterized.

Purpose of the Study:

  • To investigate the ATPase and actin-binding/motility functions of brush border myosin-I (BBMI) when associated with phospholipid membranes.
  • To determine the role of specific lipids, like phosphatidylserine (PS), and calcium in BBMI membrane interactions.

Main Methods:

  • Utilized pelleting and planar membrane assays to assess BBMI binding to various phospholipid compositions.
  • Measured BBMI ATPase activity on bound phospholipid vesicles.
  • Observed actin filament movement in the presence of membrane-bound BBMI using microscopy.

Main Results:

  • BBMI exhibits ATPase activity when bound to phospholipids, but fails to move actin filaments on phospholipid bilayers.
  • Significant BBMI binding to membranes requires a high concentration of phosphatidylserine (40%) and is enhanced by calcium.
  • Membrane-associated BBMI does not induce actin motility, even when binding is sufficient, and this is unaffected by reduced membrane fluidity.

Conclusions:

  • Brush border myosin-I (BBMI) possesses ATPase activity on membranes but lacks mechanical force generation in this state.
  • BBMI's interaction with brush border membrane lipids is weak, suggesting other factors are crucial for its membrane-associated motility.
  • The study highlights that membrane lipid composition alone is insufficient to confer mechanical activity to BBMI.

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