- EMDB-50120: CryoEM map of the F plasmid relaxosome with TraI in its TE mode, ... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-50120
タイトル
CryoEM map of the F plasmid relaxosome with TraI in its TE mode, without accessory protein TraM. ss-27_+8ds+9_+143-R_deltaTraM Locally-refined 2.94 A Map.
マップデータ
F plasmid relaxosome without accessory protein TraM: Local refinement map
試料
複合体: Complex of the relaxosome containing oriT DNA, accessory protein TraY, host protein IHF and relaxase TraI. TraM has been omitted from complex formation
複合体: Heteroduplex OriT DNA containing the nic site
DNA: T-strand DNA (96-MER)
DNA: R-strand DNA (85-MER)
複合体: IHF heterodimer
タンパク質・ペプチド: Integration host factor subunit alpha
タンパク質・ペプチド: Integration host factor subunit beta
複合体: Train of three TraY proteins
タンパク質・ペプチド: Relaxosome protein TraY
複合体: Relaxase/helicase protein TraI
タンパク質・ペプチド: Multifunctional conjugation protein TraI
リガンド: MAGNESIUM ION
キーワード
Relaxosome / Bacterial Conjugation / DNA processing / Relaxase / DNA binding proteins / DNA BINDING PROTEIN
機能・相同性
機能・相同性情報
IHF-DNA complex / DNA topoisomerase / DNA topoisomerase type I (single strand cut, ATP-independent) activity / DNA-binding transcription activator activity / protein-DNA complex / structural constituent of chromatin / regulation of translation / chromosome / DNA recombination / DNA helicase ...IHF-DNA complex / DNA topoisomerase / DNA topoisomerase type I (single strand cut, ATP-independent) activity / DNA-binding transcription activator activity / protein-DNA complex / structural constituent of chromatin / regulation of translation / chromosome / DNA recombination / DNA helicase / forked DNA-dependent helicase activity / single-stranded 3'-5' DNA helicase activity / four-way junction helicase activity / double-stranded DNA helicase activity / DNA replication / transcription cis-regulatory region binding / DNA-templated transcription / regulation of DNA-templated transcription / ATP hydrolysis activity / DNA binding / ATP binding / metal ion binding / cytosol / cytoplasm 類似検索 - 分子機能
Relaxosome protein TraY / TraY domain / DNA helicase, TraI type / Conjugative transfer relaxase protein TraI / TraI, 2B/2B-like domain / TraI, N-terminal subdomain / : / DNA helicase TraI, C-terminal / single-stranded DNA binding TraI N-terminal subdomain / DNA relaxase TraI 2B/2B-like domain ...Relaxosome protein TraY / TraY domain / DNA helicase, TraI type / Conjugative transfer relaxase protein TraI / TraI, 2B/2B-like domain / TraI, N-terminal subdomain / : / DNA helicase TraI, C-terminal / single-stranded DNA binding TraI N-terminal subdomain / DNA relaxase TraI 2B/2B-like domain / TraI helicase-associated ssDNA bd, N-terminal / Integration host factor, alpha subunit / Integration host factor, beta subunit / Conjugative relaxase, N-terminal / TrwC relaxase / TrwC relaxase / Histone-like DNA-binding protein, conserved site / Bacterial histone-like DNA-binding proteins signature. / Histone-like DNA-binding protein / Bacterial DNA-binding protein / bacterial (prokaryotic) histone like domain / Integration host factor (IHF)-like DNA-binding domain superfamily / AAA domain / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
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 has been omitted 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 has been omitted from complex formation
複合体: Heteroduplex OriT DNA containing the nic site
DNA: T-strand DNA (96-MER)
DNA: R-strand DNA (85-MER)
複合体: IHF heterodimer
タンパク質・ペプチド: Integration host factor subunit alpha
タンパク質・ペプチド: Integration host factor subunit beta
複合体: Train of three TraY proteins
タンパク質・ペプチド: Relaxosome protein TraY
複合体: Relaxase/helicase protein TraI
タンパク質・ペプチド: Multifunctional conjugation protein TraI
リガンド: MAGNESIUM ION
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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 has been omitted from complex formation タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#6
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超分子 #2: Heteroduplex OriT DNA containing the nic site
超分子
名称: Heteroduplex OriT DNA containing the nic site / タイプ: complex / ID: 2 / 親要素: 1 / 含まれる分子: #1-#2 詳細: Prepared by annealing of chemically synthesised oligos
解像度のタイプ: BY AUTHOR / 解像度: 2.94 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 使用した粒子像数: 330708
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: Local refinement
FSC曲線 (解像度の算出)
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原子モデル構築 1
精密化
プロトコル: AB INITIO MODEL
得られたモデル
PDB-9f10: CryoEM structure of the F plasmid relaxosome with TraI in its TE mode, without accessory protein TraM. Derived from the ss-27_+8ds+9_+143-R_deltaTraM Locally-refined 2.94 A Map.