Characterization of Small-Molecule-Induced Changes in Parkinson's-Related Trafficking via the Nedd4 Ubiquitin Signaling Cascade.

Journal Article (Journal Article)

The benzdiimidazole NAB2 rescues α-synuclein-associated trafficking defects associated with early onset Parkinson's disease in a Nedd4-dependent manner. Despite identification of E3 ubiquitin ligase Nedd4 as a putative target of NAB2, its molecular mechanism of action has not been elucidated. As such, the effect of NAB2 on Nedd4 activity and specificity was interrogated through biochemical, biophysical, and proteomic analyses. NAB2 was found to bind Nedd4 (KDapp = 42 nM), but this binding is side chain mediated and does not alter its conformation or ubiquitination kinetics in vitro. Nedd4 co-localizes with trafficking organelles, and NAB2 exposure did not alter its co-localization. Ubiquitin enrichment coupled proteomics revealed that NAB2 stimulates ubiquitination of trafficking-associated proteins, most likely through modulating the substrate specificity of Nedd4, providing a putative protein network involved in the NAB2 mechanism and revealing trafficking scaffold protein TFG as a Nedd4 substrate.

Full Text

Duke Authors

Cited Authors

  • Hatstat, AK; Ahrendt, HD; Foster, MW; Mayne, L; Moseley, MA; Englander, SW; McCafferty, DG

Published Date

  • January 21, 2021

Published In

Volume / Issue

  • 28 / 1

Start / End Page

  • 14 - 25.e9

PubMed ID

  • 33176158

Electronic International Standard Serial Number (EISSN)

  • 2451-9448

Digital Object Identifier (DOI)

  • 10.1016/j.chembiol.2020.10.008

Language

  • eng

Conference Location

  • United States