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-Structure paper
| タイトル | Molecular structure of the ESCRT-III-based archaeal CdvAB cell division machinery. |
|---|---|
| ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 123, Issue 3, Page e2525941123, Year 2026 |
| 掲載日 | 2026年1月20日 |
著者 | Tina Drobnič / Ralf Salzer / Tim Nierhaus / Margaret Ke Xin Jiang / Dom Bellini / Astrid Steindorf / Sonja-Verena Albers / Buzz Baum / Jan Löwe / ![]() |
| PubMed 要旨 | Most prokaryotes divide using filaments of the tubulin-like FtsZ protein, while some archaea employ instead ESCRT-III-like proteins and their filaments for cell division and cytokinesis. The ...Most prokaryotes divide using filaments of the tubulin-like FtsZ protein, while some archaea employ instead ESCRT-III-like proteins and their filaments for cell division and cytokinesis. The alternative archaeal system comprises Cdv proteins and is thought to bear some resemblance to ESCRT-III-based membrane remodeling in other domains of life, including eukaryotes, especially during abscission. Here, we present biochemical, crystallographic, and cryo-EM studies of the Cdv machinery. CdvA, an early non-ESCRT component, adopts a PRC-domain/coiled-coil fold and polymerizes into long double-stranded helical filaments, mainly via hydrophobic interfaces. Monomeric CdvB adopts the canonical ESCRT-III fold in both a closed and a distinct "semiopen" conformation. Soluble CdvB2 filaments are composed of subunits in the closed state, appearing to transition to the open, active state only when polymerized on membranes. Short N-terminal amphipathic helices in all CdvB paralogues, B, B1, and B2, mediate membrane binding and are required for liposome recruitment in vitro. We provide a molecular overview of archaeal ESCRT-III-based cytokinesis machinery, the definitive demonstration that CdvB proteins are bona fide ESCRT-III homologues, and reveal the molecular basis for membrane engagement. Thus, we illuminate conserved principles of ESCRT-mediated membrane remodeling and extend them to an anciently diverged archaeal lineage. |
リンク | Proc Natl Acad Sci U S A / PubMed:41543908 / PubMed Central |
| 手法 | EM (らせん対称) / X線回折 |
| 解像度 | 2.2 - 4.07 Å |
| 構造データ | EMDB-54673, PDB-9s97: EMDB-54674, PDB-9s98: EMDB-54675, PDB-9s99: EMDB-54678, PDB-9s9h: ![]() PDB-9s9g: ![]() PDB-9s9i: ![]() PDB-9s9j: ![]() PDB-9s9k: |
| 化合物 | ![]() ChemComp-HOH: |
| 由来 |
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キーワード | CELL CYCLE / cell division / ESCRT-III / membrane remodelling / archaea |
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sulfolobus acidocaldarius (好気性・好酸性)
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