- EMDB-50105: Initial 3D Map of relaxosome complex with oriT DNA ds-67_+113(pol... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-50105
タイトル
Initial 3D Map of relaxosome complex with oriT DNA ds-67_+113(poly-dT15-17_-3)deltaTraM
マップデータ
3D refinement map Unsharpened
試料
複合体: Complex of the relaxosome containing oriT DNA, accessory protein TraY, host protein IHF and relaxase TraI. TraM was excluded from complex formation
キーワード
Relaxosome / Bacterial Conjugation / DNA processing / Relaxase / DNA binding proteins / DNA BINDING PROTEIN
ジャーナル: Nat Commun / 年: 2025 タイトル: Cryo-EM Structure of the relaxosome, a complex essential for bacterial mating and the spread of antibiotic resistance genes. 著者: Sunanda M Williams / Sandra Raffl / Sabine Kienesberger / Aravindan Ilangovan / Ellen L Zechner / Gabriel Waksman / 要旨: Bacterial mating, or conjugation, was discovered nearly 80 years ago as a process transferring genes from one bacterial cell (the donor) to another (the recipient). It requires three key multiprotein ...Bacterial mating, or conjugation, was discovered nearly 80 years ago as a process transferring genes from one bacterial cell (the donor) to another (the recipient). It requires three key multiprotein complexes in the donor cell: a DNA-processing machinery called the relaxosome, a double-membrane spanning type 4 secretion system (T4SS), and an extracellular appendage termed pilus. While the near-atomic resolution structures of the T4SS and pilus are already known, that of the relaxosome has not been reported to date. Here, we describe the cryo-EM structure of the fully assembled relaxosome encoded by the paradigm F plasmid in two different states corresponding to distinct functional steps along the DNA processing reaction. By varying the structures of model DNAs we delineate conformational changes required to initiate conjugation. Mutational studies of the various protein-protein and protein-DNA interaction hubs suggest a complex sensitive to trigger signals, that could arise from cell-to-cell contacts with recipient cells.
全体 : Complex of the relaxosome containing oriT DNA, accessory protein ...
全体
名称: Complex of the relaxosome containing oriT DNA, accessory protein TraY, host protein IHF and relaxase TraI. TraM was excluded from complex formation
要素
複合体: Complex of the relaxosome containing oriT DNA, accessory protein TraY, host protein IHF and relaxase TraI. TraM was excluded from complex formation
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超分子 #1: Complex of the relaxosome containing oriT DNA, accessory protein ...
超分子
名称: Complex of the relaxosome containing oriT DNA, accessory protein TraY, host protein IHF and relaxase TraI. TraM was excluded from complex formation タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#8
解像度のタイプ: BY AUTHOR / 解像度: 4.43 Å / 解像度の算出法: FSC 0.143 CUT-OFF 詳細: A reconstruction resulting from initial processing of the cryoEM dataset to yield a low resolution map showing order/disorder in the trans-esterase (TE) domain of TraI. In this initial 3D map ...詳細: A reconstruction resulting from initial processing of the cryoEM dataset to yield a low resolution map showing order/disorder in the trans-esterase (TE) domain of TraI. In this initial 3D map of the relaxosome, TE domain is ordered as the oriT DNA (ds-67_+113(poly-dT15-17_-3)deltaTraM) used was conducive to dsDNA melting. 使用した粒子像数: 346208
初期 角度割当
タイプ: MAXIMUM LIKELIHOOD / 詳細: CryoSPARC ab-initio
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD / 詳細: Homogeneous refinement