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-Structure paper
タイトル | Doa10/MARCH6 architecture interconnects E3 ligase activity with lipid-binding transmembrane channel to regulate SQLE. |
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ジャーナル・号・ページ | Nat Commun, Vol. 15, Issue 1, Page 410, Year 2024 |
掲載日 | 2024年1月9日 |
著者 | J Josephine Botsch / Roswitha Junker / Michèle Sorgenfrei / Patricia P Ogger / Luca Stier / Susanne von Gronau / Peter J Murray / Markus A Seeger / Brenda A Schulman / Bastian Bräuning / |
PubMed 要旨 | Transmembrane E3 ligases play crucial roles in homeostasis. Much protein and organelle quality control, and metabolic regulation, are determined by ER-resident MARCH6 E3 ligases, including Doa10 in ...Transmembrane E3 ligases play crucial roles in homeostasis. Much protein and organelle quality control, and metabolic regulation, are determined by ER-resident MARCH6 E3 ligases, including Doa10 in yeast. Here, we present Doa10/MARCH6 structural analysis by cryo-EM and AlphaFold predictions, and a structure-based mutagenesis campaign. The majority of Doa10/MARCH6 adopts a unique circular structure within the membrane. This channel is established by a lipid-binding scaffold, and gated by a flexible helical bundle. The ubiquitylation active site is positioned over the channel by connections between the cytosolic E3 ligase RING domain and the membrane-spanning scaffold and gate. Here, by assaying 95 MARCH6 variants for effects on stability of the well-characterized substrate SQLE, which regulates cholesterol levels, we reveal crucial roles of the gated channel and RING domain consistent with AlphaFold-models of substrate-engaged and ubiquitylation complexes. SQLE degradation further depends on connections between the channel and RING domain, and lipid binding sites, revealing how interconnected Doa10/MARCH6 elements could orchestrate metabolic signals, substrate binding, and E3 ligase activity. |
リンク | Nat Commun / PubMed:38195637 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.58 - 6.73 Å |
構造データ | EMDB-17597, PDB-8pd0: EMDB-17608, PDB-8pda: EMDB-17609: Low resolution map of Doa10 in MSP1E3D1 EMDB-17610: Doa10 in MSP2N2 |
化合物 | ChemComp-PCW: ChemComp-PX6: |
由来 |
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キーワード | LIGASE / ERAD / Doa10 / March6 / TEB4 / retrotranslocation / ubiquitination / Ubc6 / sybody / SQLE / squalenemonooxygenase |