1. Identification of Small-Molecule Activators of the Ubiquitin Ligase E6AP/UBE3A and Angelman Syndrome-Derived E6AP/UBE3A Variants
- Author
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Daniel Hammler, Franziska Müller, Stormy J. Chamberlain, Jasmin Jansen, Carissa L. Sirois, Andreas Marx, Florian Stengel, Kathrin H. Götz, Martin Scheffner, and Fabian Offensperger
- Subjects
Angelman syndrome ,E6AP ,UBE3A ,ubiquitin ligase ,fluorescence polarization ,high-throughput screen ,small-molecule activator ,cross-linking coupled to mass spectrometry ,XL-MS ,Protein Conformation ,Ubiquitin-Protein Ligases ,Clinical Biochemistry ,UBE3A gene ,01 natural sciences ,Biochemistry ,Small Molecule Libraries ,ddc:570 ,Drug Discovery ,Enzyme Stability ,medicine ,Point Mutation ,Molecular Biology ,Gene ,Pharmacology ,Genetics ,biology ,010405 organic chemistry ,Point mutation ,medicine.disease ,Small molecule ,0104 chemical sciences ,Ubiquitin ligase ,Enzyme Activation ,Drug Design ,biology.protein ,Molecular Medicine ,Identification (biology) ,Angelman Syndrome - Abstract
Genetic aberrations of the UBE3A gene encoding the E3 ubiquitin ligase E6AP underlie the development of Angelman syndrome (AS). Approximately 10% of AS individuals harbor UBE3A genes with point mutations, frequently resulting in the expression of full-length E6AP variants with defective E3 activity. Since E6AP exists in two states, an inactive and an active one, we hypothesized that distinct small molecules can stabilize the active state and that such molecules may rescue the E3 activity of AS-derived E6AP variants. Therefore, we established an assay that allows identifying modulators of E6AP in a high-throughput format. We identified several compounds that not only stimulate wild-type E6AP but also rescue the E3 activity of certain E6AP variants. Moreover, by chemical cross-linking coupled to mass spectrometry we provide evidence that the compounds stabilize an active conformation of E6AP. Thus, these compounds represent potential lead structures for the design of drugs for AS treatment. published
- Published
- 2020