ジャーナル: Proc Natl Acad Sci U S A / 年: 2025 タイトル: In situ architecture of a nucleoid-associated biomolecular co-condensate that regulates bacterial cell division. 著者: Peng Xu / Dominik Schumacher / Chuan Liu / Andrea Harms / Marcel Dickmanns / Florian Beck / Jürgen M Plitzko / Wolfgang Baumeister / Lotte Søgaard-Andersen / 要旨: In most bacteria, cell division depends on the tubulin-homolog FtsZ that polymerizes in a GTP-dependent manner to form the cytokinetic Z-ring at the future division site. Subsequently, the Z-ring ...In most bacteria, cell division depends on the tubulin-homolog FtsZ that polymerizes in a GTP-dependent manner to form the cytokinetic Z-ring at the future division site. Subsequently, the Z-ring recruits, directly or indirectly, all other proteins of the divisome complex that executes cytokinesis. A critical step in this process is the precise positioning of the Z-ring at the future division site. While the divisome proteins are generally conserved, the regulatory systems that position the Z-ring are more diverse. However, these systems have in common that they modulate FtsZ polymerization. In PomX, PomY, and PomZ form precisely one MDa-sized, nonstoichiometric, nucleoid-associated assembly that spatiotemporally guides Z-ring formation. Here, using cryo-correlative light and electron microscopy together with in situ cryoelectron tomography, we determine the PomXYZ assembly's architecture at close-to-live conditions. PomX forms a porous meshwork of randomly intertwined filaments. Templated by this meshwork, the phase-separating PomY protein forms a biomolecular condensate that compacts and bends the PomX filaments, resulting in the formation of a selective PomXYZ co-condensate that is associated to the nucleoid by PomZ. These studies reveal a hitherto undescribed supramolecular structure and provide a framework for understanding how a nonstoichiometric co-condensate forms, maintains number control, and nucleates GTP-dependent FtsZ polymerization to precisely regulate cell division.
凍結剤: ETHANE-PROPANE / チャンバー内湿度: 100 % / 装置: FEI VITROBOT MARK IV
詳細
To purify PomX-His6 plasmid pEMR3 was propagated in E. coli(DE3) cells (NEB). Cells were grown in LB medium with kanamycin at 30 degree to an OD600 of 0.6. Protein accumulation was induced with 0.5mM IPTG for 16 hrs at 18 degree.