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A Rhodopsin Transport Assay by High-Content Imaging Analysis
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Misfolded rhodopsin mutants display variable aggregation properties.

Megan Gragg1, Paul S-H Park1

  • 1Department of Ophthalmology and Visual Sciences, Case Western Reserve University, Cleveland, OH 44106, USA.

Biochimica Et Biophysica Acta. Molecular Basis of Disease
|June 12, 2018
PubMed
Summary
This summary is machine-generated.

Misfolding rhodopsin mutations cause autosomal dominant retinitis pigmentosa (adRP). New FRET methods reveal varied aggregation, impacting disease understanding and suggesting retinoid chaperones may be ineffective.

Keywords:
G protein-coupled receptorPhototransductionProtein aggregationProtein misfoldingRetinal degenerationRetinitis pigmentosa

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Autosomal dominant retinitis pigmentosa (adRP) is often caused by rhodopsin mutations leading to receptor misfolding and aggregation.
  • Existing classifications of these mutants are insufficient for understanding disease mechanisms or developing therapies.

Purpose of the Study:

  • To directly assess the aggregation properties of misfolding rhodopsin mutants within cells using Förster resonance energy transfer (FRET).
  • To differentiate the behavior of partial and complete misfolding mutants and their response to pharmacological chaperones.

Main Methods:

  • Utilized Förster resonance energy transfer (FRET) to analyze rhodopsin mutant aggregation in cellular models.
  • Characterized partial (P23H, P267L) and complete (G188R, H211P, P267R) misfolding mutants.
  • Assessed mutant interactions with wild-type rhodopsin and response to 9-cis retinal.

Main Results:

  • Complete misfolding mutants consistently formed aggregates and showed minimal interaction with wild-type rhodopsin, unresponsive to 9-cis retinal.
  • Partial mutants exhibited varied aggregation: P23H behaved like complete mutants, while P267L formed aggregates and oligomers.
  • Both partial mutants improved folding with 9-cis retinal but aggregated with wild-type rhodopsin when coexpressed.

Conclusions:

  • Rhodopsin mutant aggregation properties vary, necessitating tailored therapeutic strategies for adRP.
  • The distinct behaviors of partial mutants suggest different disease pathologies.
  • Retinoid-based chaperones may be ineffective or detrimental for certain rhodopsin misfolding mutants in adRP.