ジャーナル: Nature / 年: 2020 タイトル: Structural basis for dimerization quality control. 著者: Elijah L Mena / Predrag Jevtić / Basil J Greber / Christine L Gee / Brandon G Lew / David Akopian / Eva Nogales / John Kuriyan / Michael Rape / 要旨: Most quality control pathways target misfolded proteins to prevent toxic aggregation and neurodegeneration. Dimerization quality control further improves proteostasis by eliminating complexes of ...Most quality control pathways target misfolded proteins to prevent toxic aggregation and neurodegeneration. Dimerization quality control further improves proteostasis by eliminating complexes of aberrant composition, 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 β-sheet around a highly divergent β-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.
温度: 293 K / 手法: 蒸気拡散法, ハンギングドロップ法 詳細: 160-400 mM lithium acetate and 14-18% PEG 3350 1:1 with protein at 11mg/ml in 150 mM NaCl, 25 mM Tris-HCl pH 8.0, 1 mM TCEP
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データ収集
回折
平均測定温度: 100 K / Serial crystal experiment: N
放射光源
由来: シンクロトロン / サイト: ALS / ビームライン: 8.3.1 / 波長: 1.11583 Å