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The beta-tubulin monomer release factor (p14) has homology with a region of the DnaJ protein

M Llosa1, K Aloria, R Campo

  • 1Departamento de Biología Molecular, Facultad de Medicina, Universidad de Cantabria, Santander, Spain.

FEBS Letters
|November 18, 1996
PubMed

Insights

p14 protein aids beta-tubulin folding by releasing monomers from complexes and dimers. A specific mutation in p14 disrupts this crucial monomer-release activity, suggesting a key interaction site.

Area of Science:

  • Molecular biology
  • Protein folding
  • Biochemistry

Background:

  • p14 is a molecular chaperone essential for beta-tubulin folding.
  • It catalyzes the release of beta-tubulin monomers from intermediate complexes.

Purpose of the Study:

  • To investigate the mechanism of p14's beta-tubulin monomer-release activity.
  • To explore the structural and functional relationship between p14 and DnaJ.

Main Methods:

  • Purification of active p14 protein from Escherichia coli.
  • Biochemical assays to assess monomer-release activity from tubulin dimers.
  • Site-directed mutagenesis and gene deletions of the p14 protein.
  • Secondary structure analysis of p14.

Main Results:

  • Active p14 releases beta-tubulin monomers from tubulin dimers with cofactor Z.
  • p14 shares structural similarities with the J-domain of DnaJ.
  • A D-to-E mutation in a conserved loop region significantly impaired p14's monomer-release activity.

Conclusions:

  • The p14 loop likely interacts with beta-tubulin, similar to DnaJ's interaction with DnaK.
  • p14 may play a critical role in the beta-tubulin folding pathway through this interaction.

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