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Related Concept Videos

Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Related Experiment Video

Updated: Feb 23, 2026

Extracting Modified Microtubules from Mammalian Cells to Study Microtubule-Protein Complexes by Cryo-Electron Microscopy
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Electrostatic differences: A possible source for the functional differences between MCF7 and brain microtubules.

Mitra Shojania Feizabadi1, Brandon Rosario2, Marcos A V Hernandez1

  • 1Department of Physics, Seton Hall University, South Orange, NJ 07079, USA.

Biochemical and Biophysical Research Communications
|September 10, 2017
PubMed
Summary
This summary is machine-generated.

MCF7 cancer microtubules exhibit distinct properties due to beta tubulin isotype differences. Their higher negative charge explains slower dynamics and impacts molecular motor transport, unlike brain microtubules.

Keywords:
Electro-orientationElectrostatic specificationMCF7 cellMicrotubulePorcine brain cellTubulin isotypes

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Area of Science:

  • Biophysics
  • Cell Biology
  • Cancer Research

Background:

  • Microtubule structure and dynamics are influenced by beta tubulin isotypes.
  • MCF7 cancer microtubules display different dynamics and molecular motor translocation compared to porcine brain microtubules.
  • Beta tubulin isotype diversity, particularly in carboxy-terminal tails, affects electrostatic properties.

Purpose of the Study:

  • To investigate if the negative electrostatic charge of tubulin isotypes contributes to functional differences between MCF7 and brain microtubules.
  • To experimentally assess the role of charge in microtubule dynamics and motor protein interactions.

Main Methods:

  • Electro-orientation of MCF7 and porcine brain microtubules in a uniform electric field.
  • Quantification and comparison of the average normalized polarization coefficient for both microtubule types.

Main Results:

  • MCF7 microtubules showed a significantly higher polarization coefficient than porcine brain microtubules.
  • This higher polarization indicates a greater negative charge on MCF7 microtubules.
  • The findings correlate with previously reported slower intrinsic dynamics of MCF7 microtubules in vitro.

Conclusions:

  • The increased negative electrostatic charge of MCF7 microtubules is a key factor explaining their altered dynamics.
  • This charge difference likely impacts molecular motor translocation by modifying electrostatic interactions.
  • Understanding these charge-dependent properties is crucial for comprehending cancer microtubule function and motor protein behavior.