Fenretinide binding to the lysosomal protein saposin D alters ceramide solubilization and hydrolysis
Literature Information
Brandon T. Milliken, Lindy Melegari, Gideon L. Smith, Kris Grohn, Fadi Bou-Abdallah
Fenretinide is a synthetic retinoid pharmaceutical linked to ceramide build-up in vivo. Saposin D is an intralysosomal protein necessary for ceramide binding/degradation. We show, via electronic absorption spectroscopy, fluorescence spectroscopy, and ceramide hydrolysis assays, that fenretinide is bound by saposin D {Ka = (1.45 ± 0.49) × 105 M−1}, and affects ceramide solubilization/degradation.
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