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-Structure paper
タイトル | Three-dimensional architecture of ESCRT-III flat spirals on the membrane. |
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ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 121, Issue 20, Page e2319115121, Year 2024 |
掲載日 | 2024年5月14日 |
著者 | Mingdong Liu / Yunhui Liu / Tiefeng Song / Liuyan Yang / Lei Qi / Yu-Zhong Zhang / Yong Wang / Qing-Tao Shen / |
PubMed 要旨 | The endosomal sorting complexes required for transport (ESCRTs) are responsible for membrane remodeling in many cellular processes, such as multivesicular body biogenesis, viral budding, and ...The endosomal sorting complexes required for transport (ESCRTs) are responsible for membrane remodeling in many cellular processes, such as multivesicular body biogenesis, viral budding, and cytokinetic abscission. ESCRT-III, the most abundant ESCRT subunit, assembles into flat spirals as the primed state, essential to initiate membrane invagination. However, the three-dimensional architecture of ESCRT-III flat spirals remained vague for decades due to highly curved filaments with a small diameter and a single preferred orientation on the membrane. Here, we unveiled that yeast Snf7, a component of ESCRT-III, forms flat spirals on the lipid monolayers using cryogenic electron microscopy. We developed a geometry-constrained Euler angle-assigned reconstruction strategy and obtained moderate-resolution structures of Snf7 flat spirals with varying curvatures. Our analyses showed that Snf7 subunits recline on the membrane with N-terminal motifs α0 as anchors, adopt an open state with fused α2/3 helices, and bend α2/3 gradually from the outer to inner parts of flat spirals. In all, we provide the orientation and conformations of ESCRT-III flat spirals on the membrane and unveil the underlying assembly mechanism, which will serve as the initial step in understanding how ESCRTs drive membrane abscission. |
リンク | Proc Natl Acad Sci U S A / PubMed:38709931 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 7.1 - 7.4 Å |
構造データ | EMDB-37416, PDB-8wb6: EMDB-37417, PDB-8wb7: |
由来 |
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キーワード | PROTEIN TRANSPORT / membrane fission / spiral polymers / N-terminal domain / "open" status |