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-Structure paper
| タイトル | Design principles of a membrane-spanning ubiquitin ligase. |
|---|---|
| ジャーナル・号・ページ | Mol Cell, Vol. 86, Issue 11, Page 2207-2222.e16, Year 2026 |
| 掲載日 | 2026年6月4日 |
著者 | Carys Williams / Laura M Nocka / George Hedger / Pragya Parashara / Els Pardon / Naomi R Latorraca / Ganesh V Pusapati / Parijat Sarkar / Dorothy Lartey / Lei Gao / Ljiljana Milenkovic / Rod Chalk / Jan Steyaert / Susan Marqusee / Loïc Carrique / J Fernando Bazan / Sarah L Rouse / Jennifer H Kong / Christian Siebold / Rajat Rohatgi / ![]() |
| PubMed 要旨 | Receptor-type E3 ubiquitin ligases enable extracellular signals to control ubiquitylation in the cytoplasm, playing widespread roles in development, metabolism, and immunity. Using cryoelectron ...Receptor-type E3 ubiquitin ligases enable extracellular signals to control ubiquitylation in the cytoplasm, playing widespread roles in development, metabolism, and immunity. Using cryoelectron microscopy, integrated with biophysical and functional studies, we visualized a human E3 complex composed of two transmembrane proteins, MEGF8 and MOSMO, and the intracellular RING-family protein MGRN1. This MEGF8-MOSMO-MGRN1 (MMM) complex attenuates Hedgehog signaling by ubiquitylating Smoothened (SMO), a G-protein-coupled receptor (GPCR) that transduces morphogen signals. A long helix in the MMM complex engages SMO using an intramembrane degron and extends into the cytoplasm to suspend an activated and precisely oriented RING domain below the plasma membrane. This architecture enables ubiquitylation of the cytoplasmic surface of SMO, reducing SMO abundance at primary cilia. Our structure provides insights into MEGF8 mutations, which cause multi-organ birth defects, and defines a paradigm for how transmembrane E3 ligases control the cell surface abundance of GPCRs and other signaling receptors. |
リンク | Mol Cell / PubMed:42190653 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.65 - 4.66 Å |
| 構造データ | EMDB-53313, PDB-9qqs: ![]() EMDB-53321: Focused refinement of the MGRN1 ubiquitin ligase in complex with MEGF8, MOSMO and nanobody 270 ![]() EMDB-53322: Structure of the MMM ubiquitin ligase complex with nanobody 270 (Consensus map) EMDB-53323, PDB-9qru: ![]() EMDB-53327: Structure of the helix-stabilized MMM ubiquitin ligase complex with nanobody 270 (Consensus map) ![]() EMDB-53328: Focused refinement of the MGRN1 ubiquitin ligase in complex with helix-stabilized MEGF8, MOSMO and nanobody 270 EMDB-53329, PDB-9qs6: ![]() EMDB-53336: Focused refinement of the MEGF8-MOSMO complex with nanobody 992 ![]() EMDB-53337: Focused refinement of the MEGF8 and MOSMO extracellular domains with nanobody 992 ![]() EMDB-53338: Focused refinement of the MGRN1 ubiquitin ligase in complex with MEGF8, MOSMO and nanobody 992 ![]() EMDB-53339: Structure of the MMM ubiquitin ligase complex with nanobody 992 (Consensus map) EMDB-53340, PDB-9qsh: EMDB-53367, PDB-9qty: ![]() EMDB-57249: Focused refinement of the helix-stabilized MEGF8-MOSMO complex with nanobody 270 |
| 化合物 | ![]() ChemComp-PLM: ![]() PDB-1jax: ![]() ChemComp-HOH: ![]() ChemComp-ZN: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / E3 Ubiquitin Ligase / Hedgehog Signaling / Single-pass Membrane Protein / Membrane Protein Complex / Smoothened / Tetraspanin / Cell Surface Receptor / Primary Cilium / Morphogen / Signal Transduction / Human / Carpenter Syndrome / Cancer / Nanobody / Palmitoylation / GDN |
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