Download MendeleyStructural Basis for Recruitment of DAPK1 to the KLHL20 E3 Ligase.
Chen, Z., Picaud, S., Filippakopoulos, P., D'Angiolella, V., Bullock, A.N.(2019) Structure 27: 1395-1404.e4
- PubMed: 31279627
- DOI: https://doi.org/10.1016/j.str.2019.06.005
- Primary Citation of Related Structures:
6GY5 - PubMed Abstract:
BTB-Kelch proteins form the largest subfamily of Cullin-RING E3 ligases, yet their substrate complexes are mapped and structurally characterized only for KEAP1 and KLHL3. KLHL20 is a related CUL3-dependent ubiquitin ligase linked to autophagy, cancer, and Alzheimer's disease that promotes the ubiquitination and degradation of substrates including DAPK1, PML, and ULK1. We identified an "LPDLV"-containing motif in the DAPK1 death domain that determines its recruitment and degradation by KLHL20. A 1.1-Å crystal structure of a KLHL20 Kelch domain-DAPK1 peptide complex reveals DAPK1 binding as a loose helical turn that inserts deeply into the central pocket of the Kelch domain to contact all six blades of the β propeller. Here, KLHL20 forms salt-bridge and hydrophobic interactions including tryptophan and cysteine residues ideally positioned for covalent inhibitor development. The structure highlights the diverse binding modes of β-propeller domains versus linear grooves and suggests a new target for structure-based drug design.
Organizational Affiliation:
Structural Genomics Consortium, University of Oxford, Old Road Campus, Roosevelt Drive, Oxford OX3 7DQ, UK.
