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Peripherin/rds influences membrane vesicle morphology. Implications for retinopathies
J D Wrigley1, T Ahmed, C L Nevett
1School of Biochemistry, University of Leeds, Leeds LS2 9JT, United Kingdom.
The Journal of Biological Chemistry
|April 5, 2000
Summary
Peripherin/rds protein is crucial for maintaining photoreceptor cell disc shape. Mutations in this protein cause retinitis pigmentosa by preventing proper vesicle morphology.
Area of Science:
- Ophthalmology
- Cell Biology
- Biochemistry
Background:
- Peripherin/rds is a photoreceptor glycoprotein implicated in retinal degenerative disorders.
- Its precise role in photoreceptor outer segment disc morphology remains unclear.
- The retinal degeneration slow (rds) mouse model mimics human retinitis pigmentosa.
Purpose of the Study:
- To provide direct evidence for peripherin/rds's role in maintaining photoreceptor outer segment vesicle morphology.
- To investigate the molecular mechanisms underlying peripherin/rds's function.
- To link specific mutations to the pathogenesis of retinitis pigmentosa.
Main Methods:
- In vitro expression and characterization of peripherin/rds.
- Biochemical analysis including N-glycosylation and disulfide bonding.
- Electron microscopy of microsomal vesicles treated with peripherin/rds.
- Analysis of pathogenic mutants (P216L and C165Y).
Main Results:
- Expressed peripherin/rds is a 36-kDa membrane glycoprotein undergoing N-glycosylation, disulfide bonding, and dimerization.
- Peripherin/rds directly flattens microsomal vesicles in vitro.
- This flattening effect depends on disulfide bond formation but not N-glycosylation.
- Pathogenic mutants P216L and C165Y fail to flatten vesicles.
Conclusions:
- Peripherin/rds plays a direct, essential role in maintaining the flattened morphology of photoreceptor outer segment discs.
- Disulfide bond formation is critical for this function.
- Mutations impairing vesicle flattening are a primary cause of peripherin/rds-mediated retinitis pigmentosa.