- PDB-5n8o: Cryo EM structure of the conjugative relaxase TraI of the F/R1 pl... -
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基本情報
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データベース: PDB / ID: 5n8o
タイトル
Cryo EM structure of the conjugative relaxase TraI of the F/R1 plasmid system
要素
DNA (5'-D(P*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*TP*T)-3')
DNA helicase I
キーワード
TRANSFERASE / Relaxase / Cryo EM / Helicase / translocase
機能・相同性
機能・相同性情報
DNA topoisomerase / DNA topoisomerase type I (single strand cut, ATP-independent) activity / hydrolase activity, acting on acid anhydrides, in phosphorus-containing anhydrides / metabolic process / DNA helicase activity / DNA helicase / ATP hydrolysis activity / DNA binding / ATP binding / metal ion binding / cytoplasm 類似検索 - 分子機能
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 / Conjugative relaxase, N-terminal / TrwC relaxase / TrwC relaxase ...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 / Conjugative relaxase, N-terminal / TrwC relaxase / TrwC relaxase / AAA domain / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
DNA / DNA (> 10) / Multifunctional conjugation protein TraI / DNA helicase I 類似検索 - 構成要素
ジャーナル: Cell / 年: 2017 タイトル: Cryo-EM Structure of a Relaxase Reveals the Molecular Basis of DNA Unwinding during Bacterial Conjugation. 著者: Aravindan Ilangovan / Christopher W M Kay / Sandro Roier / Hassane El Mkami / Enrico Salvadori / Ellen L Zechner / Giulia Zanetti / Gabriel Waksman / 要旨: Relaxases play essential roles in conjugation, the main process by which bacteria exchange genetic material, notably antibiotic resistance genes. They are bifunctional enzymes containing a trans- ...Relaxases play essential roles in conjugation, the main process by which bacteria exchange genetic material, notably antibiotic resistance genes. They are bifunctional enzymes containing a trans-esterase activity, which is responsible for nicking the DNA strand to be transferred and for covalent attachment to the resulting 5'-phosphate end, and a helicase activity, which is responsible for unwinding the DNA while it is being transported to a recipient cell. Here we show that these two activities are carried out by two conformers that can both load simultaneously on the origin of transfer DNA. We solve the structure of one of these conformers by cryo electron microscopy to near-atomic resolution, elucidating the molecular basis of helicase function by relaxases and revealing insights into the mechanistic events taking place in the cell prior to substrate transport during conjugation.
平均露光時間: 0.4 sec. / 電子線照射量: 2.5 e/Å2 / 検出モード: COUNTING フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 撮影したグリッド数: 1 / 実像数: 2900 / 詳細: Total exposure 8 sec for a total dose of 50 e-
電子光学装置
エネルギーフィルター名称: GIF / エネルギーフィルター 上限: 20 eV / エネルギーフィルター 下限: 0 eV