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Related Experiment Videos

Calcium ion binding to thrombospondin 1

T M Misenheimer1, D F Mosher

  • 1Department of Medicine, University of Wisconsin-Madison 53706.

The Journal of Biological Chemistry
|January 27, 1995
PubMed
Summary

Calcium (Ca2+) binds cooperatively to platelet thrombospondin 1 (TSP1), influencing its structure and protease sensitivity. This binding is specific and high-capacity, revealing insights into TSP1

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Structure

Background:

  • Platelet thrombospondin 1 (TSP1) is a crucial extracellular matrix protein involved in various cellular processes.
  • Understanding the regulation of TSP1 conformation and function is vital for comprehending its biological roles.

Purpose of the Study:

  • To quantify the binding of calcium ions (Ca2+) to TSP1.
  • To investigate the effect of Ca2+ binding on TSP1's structural conformation and protease sensitivity.

Main Methods:

  • Equilibrium dialysis using 45CaCl2 was employed to measure Ca2+ binding to TSP1.
  • Protease sensitivity assays using trypsin were performed to assess structural changes upon Ca2+ binding.

Main Results:

  • Ca2+ binding to TSP1 is cooperative, with a Hill coefficient of 2.4 +/- 0.2 and an apparent Kd of 52 +/- 5 microM.
  • Maximum binding capacity was determined to be 35 +/- 3 Ca2+ ions per TSP1 molecule.
  • Ca2+ protected the aspartate-rich region from trypsinolysis only at high occupancy, suggesting conformational stabilization of subregions.

Conclusions:

  • TSP1 exhibits high-capacity, cooperative, and specific binding of Ca2+ to its conformationally labile aspartate-rich repeats.
  • Ca2+ binding induces conformational changes in TSP1, affecting its susceptibility to proteolysis.
  • These findings provide direct evidence for the role of Ca2+ in modulating TSP1 structure and function.

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