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Related Experiment Videos

Dynein isoforms in sea urchin eggs.

M E Porter1, P M Grissom, J M Scholey

  • 1Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder 80309-0347.

The Journal of Biological Chemistry
|May 15, 1988
PubMed
Summary

Sea urchin eggs contain two dynein isoforms: a soluble form related to ciliary dynein and a distinct microtubule-associated protein (HMr-3) that may not be a ciliary precursor.

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Area of Science:

  • Cell Biology
  • Molecular Motors
  • Biochemistry

Background:

  • Cytoplasmic dyneins are essential molecular motors involved in intracellular transport.
  • Sea urchin eggs serve as a model system for studying cytoskeletal dynamics and protein function.
  • Understanding dynein isoforms is crucial for elucidating their diverse roles in cellular processes.

Purpose of the Study:

  • To biochemically and immunologically characterize dynein isoforms in unfertilized sea urchin eggs.
  • To compare the properties of soluble cytoplasmic dynein with a microtubule-associated dynein-like polypeptide (HMr-3).
  • To investigate the potential relationship between egg dyneins and ciliary dynein.

Main Methods:

  • Biochemical assays including MgATPase activity measurements and sucrose density gradient sedimentation.
  • Immunological techniques utilizing antibodies against flagellar dynein.
  • Analysis of polypeptide composition using high-resolution SDS-PAGE and UV-induced cleavage studies.

Main Results:

  • Two distinct cytoplasmic dynein isoforms were identified: a soluble 20S particle and a microtubule-associated polypeptide (HMr-3).
  • The soluble dynein shares characteristics with embryonic ciliary dynein, suggesting it may be a precursor.
  • HMr-3 exhibits distinct properties from soluble dynein, including weaker antibody cross-reactivity and different cleavage fragments, indicating it's a separate entity.

Conclusions:

  • Unfertilized sea urchin eggs possess at least two distinct cytoplasmic dynein isoforms.
  • Soluble egg dynein is closely related to axonemal dynein and potentially serves as a ciliary precursor.
  • The microtubule-associated polypeptide HMr-3 represents a distinct dynein-like molecule, separate from the ciliary dynein precursor pool.

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