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• W2000232627 abstract "Photoreceptor peripherin/rds promotes membrane fusion, through a putative fusion domain located within the C-terminus (Boesze-Battaglia et al., Biochemistry 37 (1998) 9477-9487). A peptide analogue to this region, PP-5, competitively inhibits peripherin/rds mediated fusion in a cell free assay system. To characterize how this region is involved in the fusion process we investigated two of the individual steps in membrane fusion, membrane adhesion and membrane destabilization inferred from depolarization studies. Membrane depolarization was measured as the collapse of a valinomycin induced K(+) diffusion potential in model membranes, using a potential sensitive fluorescent probe, diS-C(2)-5. PP-5 induced membrane depolarization in a concentration dependent manner. PP-5 has been shown by Fourier transform infrared spectroscopy to be an amphiphilic alpha-helix. Therefore, the requirement for an amphiphilic alpha-helix to promote depolarization was tested using two mutant peptides designed to disrupt either the amphiphilic nature of PP-5 (PP-5AB) or the alpha-helical structure (PP-5HB). PP-5AB inhibited PP-5 induced depolarization when added in an equimolar ratio to PP-5. Neither mutant peptide alone or in combination with PP-5 had any effect on calcium dependent vesicle aggregation. Using non-denaturing gel electrophoresis and size exclusion chromatography techniques PP-5 was shown to form a tetrameric complex. Equimolar mixtures of PP-5 and PP-5AB formed a heterotetramer which was unable to promote membrane depolarization. The hypothesis that PP-5 tetramers promote membrane depolarization is consistent with the calculated Hill coefficient of 3.725, determined from a Hill analysis of the depolarization data." @default.
• W2000232627 created "2016-06-24" @default.
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• W2000232627 date "2000-02-01" @default.
• W2000232627 modified "2023-10-17" @default.
• W2000232627 title "A peptide analogue to a fusion domain within photoreceptor peripherin/rds promotes membrane adhesion and depolarization" @default.
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• W2000232627 doi "https://doi.org/10.1016/s0005-2736(99)00226-6" @default.
• W2000232627 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4732729" @default.
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