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Decrease in protein solubility and cataract formation caused by the Pro23 to Thr mutation in human gamma

Ajay Pande1, Onofrio Annunziata, Neer Asherie

  • 1Materials Processing Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Biochemistry
|February 16, 2005
PubMed
Summary
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The P23T mutation in human gammaD-crystallin causes cataracts by dramatically reducing protein solubility, leading to protein aggregation. Specific mutations can restore solubility, offering potential therapeutic strategies.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Ophthalmology

Background:

  • The P23T mutation in human gammaD-crystallin (HGD) is linked to various cataract phenotypes.
  • Understanding the molecular basis of HGD mutations is crucial for developing cataract treatments.

Purpose of the Study:

  • To investigate the molecular mechanism behind cataract formation caused by the P23T mutation in HGD.
  • To compare the structural and thermodynamic properties of native HGD and its P23T mutant.

Main Methods:

  • Expression of native HGD and P23T mutant proteins in Escherichia coli.
  • In vitro analysis of protein structure, thermodynamic properties, and solubility.
  • Examination of solubility changes with temperature and introduction of secondary mutations.

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Main Results:

  • The P23T mutation did not cause significant structural changes but drastically reduced protein solubility.
  • Reduced solubility is due to the formation of mutant protein clusters in a new condensed phase.
  • Protein cluster solubility showed inverse temperature dependence; specific mutations (P23TInsP24, P23TN24K) restored solubility.

Conclusions:

  • The P23T mutation induces cataract via protein aggregation due to decreased solubility, not structural alteration.
  • Solubility is temperature-dependent and modifiable by secondary mutations.
  • Findings may guide the development of inhibitors for this aggregation pathway.