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Related Experiment Videos

Reverse-phase HPLC analysis of human alpha crystallin.

M S Swamy1, E C Abraham

  • 1Department of Biochemistry and Molecular Biology, Medical College of Georgia, Augusta 30912-2100.

Current Eye Research
|March 1, 1991
PubMed
Summary

Modified alpha crystallin, particularly alpha A subunits, increases with age and forms high-molecular-weight aggregates. This reverse-phase HPLC method effectively separates modified alpha from unmodified subunits.

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Area of Science:

  • Ophthalmology
  • Biochemistry
  • Proteomics

Background:

  • Human alpha crystallin comprises alpha A and alpha B subunits.
  • Age-related changes in crystallin composition are linked to lens opacity.
  • Post-translational modifications of crystallins may contribute to aggregation.

Purpose of the Study:

  • To develop and validate a method for separating human alpha crystallin subunits.
  • To investigate age-related changes in alpha crystallin subunit composition.
  • To identify the components of high-molecular-weight (HMW) aggregates in the human lens.

Main Methods:

  • Reverse-phase High-Performance Liquid Chromatography (RP-HPLC) for subunit separation.
  • Electrophoretic and immunological analyses for subunit identification.
  • Molecular sieve HPLC to analyze aggregate formation.

Main Results:

  • RP-HPLC successfully separated alpha A, alpha B, and a modified alpha crystallin peak.
  • The ratio of alpha A to alpha B decreased with age, with a concurrent increase in modified alpha.
  • Modified alpha crystallin was enriched in HMW aggregates and showed altered reassociation properties.

Conclusions:

  • Modified alpha crystallin, potentially alpha A, plays a significant role in HMW aggregate formation.
  • Post-translational modifications are implicated in the formation of modified alpha crystallin.
  • The developed RP-HPLC method is valuable for studying crystallin modifications and aggregation.

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