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Related Experiment Videos

Posttranslational modification and microtubule stability.

E Schulze1, D J Asai, J C Bulinski

  • 1Department of Biochemistry and Biophysics, University of California, San Francisco 94143.

The Journal of Cell Biology
|November 1, 1987
PubMed
Summary
This summary is machine-generated.

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Microtubule stability is linked to tubulin posttranslational modification in human cells. Different cell types modulate this relationship, creating unique microtubule networks by altering modification and turnover rates.

Area of Science:

  • Cell Biology
  • Cytoskeleton Dynamics
  • Protein Biochemistry

Background:

  • Microtubules are essential cytoskeletal components involved in cell division, intracellular transport, and cell structure.
  • Tubulin, the subunit of microtubules, undergoes various posttranslational modifications (PTMs) that can influence microtubule properties.
  • The precise relationship between specific tubulin PTMs and microtubule stability remains incompletely understood across different cell types.

Purpose of the Study:

  • To investigate the correlation between tubulin posttranslational modification and microtubule stability.
  • To determine if specific PTMs are indicative of stable or dynamic microtubules.
  • To explore how this relationship varies across different cellular contexts.

Main Methods:

Related Experiment Videos

  • Utilized an antibody-blocking technique with biotin-tubulin injection to assess microtubule polymerization dynamics.
  • Analyzed human retinoblastoma cells, Potorous tridactylis kidney cells, and chick embryo fibroblast cells.
  • Examined specific tubulin PTMs, including acetylation and detyrosination, in relation to microtubule stability.

    • Main Results:

    • In human retinoblastoma cells, acetylated and detyrosinated microtubules were congruent subsets of total microtubules and were all stable.
    • Stable microtubules in these cells were consistently posttranslationally modified, while dynamic microtubules were unmodified.
    • Potorous tridactylis kidney cells showed stable microtubules without detectable acetylation, and chick embryo fibroblast cells had extensive modification but few stable microtubules.

    Conclusions:

    • In human retinoblastoma cells, stable, acetylated, and detyrosinated microtubules constitute the same cellular network subset.
    • Posttranslational modification is not strictly required for microtubule stability, nor is stability a prerequisite for modification.
    • Cell-specific modulation of PTM and microtubule turnover rates allows for the generation of distinct microtubule subsets.