6w66
The structure of the F64A, S172A mutant Keap1-BTB domain in complex with SKP1-FBXL17
Structural highlights
FunctionSKP1_HUMAN Essential component of the SCF (SKP1-CUL1-F-box protein) ubiquitin ligase complex, which mediates the ubiquitination of proteins involved in cell cycle progression, signal transduction and transcription. In the SCF complex, serves as an adapter that links the F-box protein to CUL1. SCF(BTRC) mediates the ubiquitination of NFKBIA at 'Lys-21' and 'Lys-22'; the degradation frees the associated NFKB1-RELA dimer to translocate into the nucleus and to activate transcription. SCF(Cyclin F) directs ubiquitination of CP110.[1] [2] Publication Abstract from PubMedMost quality control pathways target misfolded proteins to prevent toxic aggregation and neurodegeneration(1). Dimerization quality control further improves proteostasis by eliminating complexes of aberrant composition(2), but how it detects incorrect subunits remains unknown. Here we provide structural insight into target selection by SCF-FBXL17, a dimerization-quality-control E3 ligase that ubiquitylates and helps to degrade inactive heterodimers of BTB proteins while sparing functional homodimers. We find that SCF-FBXL17 disrupts aberrant BTB dimers that fail to stabilize an intermolecular beta-sheet around a highly divergent beta-strand of the BTB domain. Complex dissociation allows SCF-FBXL17 to wrap around a single BTB domain, resulting in robust ubiquitylation. SCF-FBXL17 therefore probes both shape and complementarity of BTB domains, a mechanism that is well suited to establish quality control of complex composition for recurrent interaction modules. Structural basis for dimerization quality control.,Mena EL, Jevtic P, Greber BJ, Gee CL, Lew BG, Akopian D, Nogales E, Kuriyan J, Rape M Nature. 2020 Aug 19. pii: 10.1038/s41586-020-2636-7. doi:, 10.1038/s41586-020-2636-7. PMID:32814905[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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