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Molecular Chaperones and Protein Folding

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Using Caenorhabditis elegans to Screen for Tissue-Specific Chaperone Interactions
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Published on: June 7, 2020

Cataract-causing alphaAG98R mutant shows substrate-dependent chaperone activity.

Raju Murugesan1, Puttur Santhoshkumar, K Krishna Sharma

  • 1Department of Ophthalmology and Biochemistry, University of Missouri, Columbia, MO 65212, USA.

Molecular Vision
|January 18, 2008
PubMed
Summary
This summary is machine-generated.

The G98R mutation alters alphaA-crystallin structure and chaperone function, leading to protein aggregation and potential cataract formation. This study investigates the molecular basis of G98R-associated cataracts.

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09:37

A Phenotyping Regimen for Genetically Modified Mice Used to Study Genes Implicated in Human Diseases of Aging

Published on: July 14, 2016

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Ophthalmology

Background:

  • Autosomal dominant cataract (presenile type) is linked to the G98R mutation in human alphaA-crystallin.
  • The precise mechanisms driving cataract development in individuals with the alphaAG98R mutation remain unclear.

Purpose of the Study:

  • To investigate the stability, structural alterations, and chaperone functionality of the alphaAG98R mutant protein.
  • To elucidate the molecular basis of cataract formation associated with the G98R mutation in alphaA-crystallin.

Main Methods:

  • Site-directed mutagenesis to create alphaAG98R mutant protein.
  • Expression and purification of recombinant wild-type and mutant alphaA-crystallin in E. coli.
  • Characterization using SDS-PAGE, electron microscopy, light scattering, and spectroscopy.
  • Assessment of chaperone-like activity with various protein substrates.

Main Results:

  • The alphaAG98R mutant formed larger oligomers and exhibited altered secondary and tertiary structures compared to wild-type alphaA-crystallin.
  • Increased surface hydrophobicity was observed in the alphaAG98R mutant.
  • Chaperone activity was substrate-dependent, with diminished efficacy against aggregating alpha-lactalbumin but preserved protection for citrate synthase and alcohol dehydrogenase.

Conclusions:

  • The G98R mutation induces conformational changes in alphaA-crystallin, promoting the formation of precipitate-prone complexes with certain substrates.
  • Accumulation of these mutant protein-substrate complexes is implicated as the cause of cataract development in individuals with the G98R mutation.