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Calcium binding to tubulin.

K C Fong1, J A Babitch, F A Anthony

  • 1Chemistry of Behavior Program, Texas Christian University, Forth Worth 76129.

Biochimica Et Biophysica Acta
|January 4, 1988
PubMed
Summary
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Researchers identified distinct high- and low-affinity calcium-binding sites on tubulin dimers. These calcium-binding sites are primarily located in the carboxyl-terminal regions of tubulin subunits.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Tubulin is a key protein in the cytoskeleton, forming microtubules.
  • Calcium ions play crucial roles in various cellular processes, including microtubule dynamics.

Purpose of the Study:

  • To characterize calcium-binding sites on tubulin dimers.
  • To investigate the influence of magnesium on calcium binding to tubulin.
  • To identify the locations of calcium-binding sites within tubulin subunits.

Main Methods:

  • Flow dialysis was employed to quantify calcium-binding sites and their affinities.
  • Proteolytic digestion with trypsin and chymotrypsin was used to determine subunit-specific binding.
  • Computer analysis of amino acid sequences was performed to predict binding site locations.

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Main Results:

  • Two classes of calcium-binding sites were identified: high-affinity (Kd ~4.86 x 10^-6 M) and low-affinity (Kd ~6.4 x 10^-5 M).
  • Magnesium sulfate altered the number and affinity of calcium-binding sites.
  • Proteolytic cleavage revealed distinct fragments for alpha- and beta-tubulin subunits.
  • High-affinity calcium-binding sites were localized to the carboxyl-terminal regions of tubulin subunits.

Conclusions:

  • Tubulin dimers possess specific high- and low-affinity calcium-binding sites.
  • Magnesium influences calcium binding to tubulin.
  • The carboxyl-terminal domains of tubulin subunits are critical for high-affinity calcium binding.