Structures of CYLD USP with Met1- or Lys63-linked diubiquitin reveal mechanisms for dual specificity.Sato, Y., Goto, E., Shibata, Y., Kubota, Y., Yamagata, A., Goto-Ito, S., Kubota, K., Inoue, J., Takekawa, M., Tokunaga, F., Fukai, S.
(2015) Nat Struct Mol Biol 22: 222-229
- PubMed: 25686088
- DOI: https://doi.org/10.1038/nsmb.2970
- Primary Citation of Related Structures:
3WXE, 3WXF, 3WXG
- PubMed Abstract:
The tumor suppressor CYLD belongs to a ubiquitin (Ub)-specific protease (USP) family and specifically cleaves Met1- and Lys63-linked polyubiquitin chains to suppress inflammatory signaling pathways. Here, we report crystal structures representing the catalytic states of zebrafish CYLD for Met1- and Lys63-linked Ub chains and two distinct precatalytic states for Met1-linked chains. In both catalytic states, the distal Ub is bound to CYLD in a similar manner, and the scissile bond is located close to the catalytic residue, whereas the proximal Ub is bound in a manner specific to Met1- or Lys63-linked chains. Further structure-based mutagenesis experiments support the mechanism by which CYLD specifically cleaves both Met1- and Lys63-linked chains and provide insight into tumor-associated mutations of CYLD. This study provides new structural insight into the mechanisms by which USP family deubiquitinating enzymes recognize and cleave Ub chains with specific linkage types.
Division of Cellular and Molecular Biology, Institute of Medical Science, University of Tokyo, Tokyo, Japan.