Mechanism and regulation of the Lys6-selective deubiquitinase USP30.Gersch, M., Gladkova, C., Schubert, A.F., Michel, M.A., Maslen, S., Komander, D.
(2017) Nat Struct Mol Biol 24: 920-930
- PubMed: 28945249
- DOI: https://doi.org/10.1038/nsmb.3475
- Primary Citation of Related Structures:
5OHK, 5OHN, 5OHP
- PubMed Abstract:
Damaged mitochondria undergo mitophagy, a specialized form of autophagy that is initiated by the protein kinase PINK1 and the ubiquitin E3 ligase Parkin. Ubiquitin-specific protease USP30 antagonizes Parkin-mediated ubiquitination events on mitochondria and is a key negative regulator of mitophagy. Parkin and USP30 both show a preference for assembly or disassembly, respectively, of Lys6-linked polyubiquitin, a chain type that has not been well studied. Here we report crystal structures of human USP30 bound to monoubiquitin and Lys6-linked diubiquitin, which explain how USP30 achieves Lys6-linkage preference through unique ubiquitin binding interfaces. We assess the interplay between USP30, PINK1 and Parkin and show that distally phosphorylated ubiquitin chains impair USP30 activity. Lys6-linkage-specific affimers identify numerous mitochondrial substrates for this modification, and we show that USP30 regulates Lys6-polyubiquitinated TOM20. Our work provides insights into the architecture, activity and regulation of USP30, which will aid drug design against this and related enzymes.
Medical Research Council Laboratory of Molecular Biology, Cambridge, UK.