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Related Experiment Videos

S100A13. Biochemical characterization and subcellular localization in different cell lines.

K Ridinger1, B W Schäfer, I Durussel

  • 1Department of Pediatrics, Division of Clinical Chemistry and Biochemistry, University of Zurich, 8032 Zurich, Switzerland.

The Journal of Biological Chemistry
|March 18, 2000
PubMed
Summary

Researchers purified and characterized human recombinant S100A13, revealing its calcium-binding properties and widespread tissue distribution, particularly in the thyroid gland. This study provides insights into S100A13

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • S100 proteins are significant due to their diverse expression, disease association, and diagnostic utility.
  • The specific functions and distribution of S100A13 have remained largely uncharacterized.

Purpose of the Study:

  • To purify and characterize human recombinant S100A13.
  • To investigate the calcium-binding properties of S100A13.
  • To determine the tissue distribution and subcellular localization of S100A13.

Main Methods:

  • Purification of human recombinant S100A13.
  • Flow dialysis for calcium-binding studies.
  • Fluorescence, difference spectrophotometry, and circular dichroism for protein characterization.
  • Immunohistochemistry using specific antisera for tissue distribution analysis.

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Main Results:

  • S100A13 homodimer binds four Ca(2+) with positive cooperativity at two sets of sites with differing affinities.
  • Calcium binding significantly alters Trp/Tyr signals and far-UV circular dichroic signals, primarily at high-affinity sites.
  • S100A13 is widely expressed across tissues, with high levels in the thyroid gland, testis, and brain.
  • Unique perinuclear localization observed in human smooth muscle cells.

Conclusions:

  • Human recombinant S100A13 exhibits distinct calcium-binding characteristics.
  • S100A13 is broadly distributed in human tissues, with notable expression in the thyroid.
  • The unique localization and calcium-binding properties suggest diverse roles for S100A13 in cellular processes, potentially in signal transduction.