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Related Experiment Videos

Cardiac alpha-crystallin. I. Isolation and identification.

S Longoni1, P James, M Chiesi

  • 1Department of Pharmaceutical Research, Ciba-Geigy, Basel, Switzerland.

Molecular and Cellular Biochemistry
|December 3, 1990
PubMed
Summary

A novel water-soluble protein, identified as alpha-B-crystallin, is a major component of rat heart cells. This lens protein is abundant in the heart, red muscles, and kidneys.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Proteomics

Context:

  • Cytosolic fraction of rat heart cells contains a major water-soluble protein.
  • Protein purification via HPLC and antibody affinity chromatography.
  • Characterization of a 24 kDa protein, existing as a homomultimer under native conditions.

Purpose:

  • To purify and characterize a major water-soluble protein from rat heart cells.
  • To determine the tissue distribution of this protein.
  • To identify the protein by comparing its structure and immunological properties to known proteins.

Summary:

  • A 24 kDa water-soluble protein was purified from rat heart cytosol.
  • The protein exists as a homomultimer (400-650 kDa) under non-denaturing conditions.
  • Tissue distribution analysis revealed abundance in heart, red muscles, and kidneys.
  • Primary structure analysis and immunological assays identified the protein as alpha-B-crystallin.
  • This study establishes alpha-B-crystallin as a significant cytosolic component in heart cells.

Impact:

  • Demonstrates that alpha-B-crystallin, a known lens protein, is a major cytosolic component of heart cells.
  • Highlights the presence and abundance of alpha-B-crystallin in cardiac tissue.
  • Provides insights into the cellular localization and tissue-specific expression of alpha-B-crystallin.

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