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Related Experiment Videos

Nuclear calmodulin/62 kDa calmodulin-binding protein complexes in interphasic and mitotic cells

M Portolés1, M Faura, J Renau-Piqueras

  • 1Centro de Investigación, Hospital LA FE, Valencia, Spain.

Journal of Cell Science
|December 1, 1994
PubMed
Summary

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This study identifies a 62 kDa calmodulin-binding protein (p62) that binds DNA and associates with chromatin. The findings suggest p62 and calmodulin play a role in chromatin condensation within the cell nucleus.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • A 62 kDa calmodulin-binding protein (p62) has been identified in the nucleus of various rat cells.
  • p62 consists of four polypeptides with isoelectric points between 5.9 and 6.1.

Purpose of the Study:

  • To characterize the DNA-binding properties of p62.
  • To investigate the intranuclear distribution of p62 and calmodulin in different cell types and states.
  • To explore the potential role of p62 and calmodulin in chromatin condensation.

Main Methods:

  • DNA-binding overlay assay to assess DNA interaction.
  • Immunogold-labeling to analyze intranuclear localization of p62 and calmodulin.
  • In situ sequential extraction with nucleases and high-salt buffers to study complex association with the nuclear matrix.

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Main Results:

  • The two most basic p62 polypeptides bind both single- and double-stranded DNA.
  • In non-dividing cells, p62 and calmodulin are localized in heterochromatin, euchromatin, and nucleoli (calmodulin only).
  • p62/calmodulin complexes are associated with the nuclear matrix and are found on mitotic chromosomes in dividing cells, though aggregates are disrupted.

Conclusions:

  • p62 exhibits DNA-binding capabilities.
  • p62 and calmodulin form complexes associated with the nuclear matrix.
  • These findings suggest a role for calmodulin and p62 in chromatin condensation.