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データを開く
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基本情報
登録情報 | データベース: PDB / ID: 9nbl | ||||||
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タイトル | Open conformation of ArsA from L. ferriphilum in complex with MgADP determined in the presence of arsenite | ||||||
![]() | Arsenite transporter ATPase-like protein,arsA | ||||||
![]() | HYDROLASE / ATPase / open conformation / arsenite / arsenic / ADP / Intradimeric Walker A | ||||||
機能・相同性 | ![]() arsenite-transporting ATPase / ATPase-coupled arsenite transmembrane transporter activity / ATP hydrolysis activity / ATP binding 類似検索 - 分子機能 | ||||||
生物種 | ![]() | ||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.4 Å | ||||||
![]() | Mahajan, S. / Rees, D.C. / Clemons, W.M. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Nucleotide- and metalloid-driven conformational changes in the arsenite efflux ATPase ArsA. 著者: Shivansh Mahajan / Ashley E Pall / Yancheng E Li / Timothy L Stemmler / Douglas C Rees / William M Clemons / ![]() 要旨: Arsenite (As) is toxic to all organisms due to its ability to tightly bind exposed thiols within cells. An important As resistance mechanism in prokaryotes involves proteins encoded by the operon. A ...Arsenite (As) is toxic to all organisms due to its ability to tightly bind exposed thiols within cells. An important As resistance mechanism in prokaryotes involves proteins encoded by the operon. A central component of the operon in many bacteria is the cytoplasmic ATPase, ArsA, which orchestrates a series of nucleotide-dependent handoffs, starting with the capture of As by the ArsD metallochaperone and culminating in its removal from the cell by the ArsB efflux pump. Although the mechanism of ArsA has been widely studied, the molecular details of how nucleotide hydrolysis modulates these events remain unclear. ArsA is an archetypal member of the intradimeric Walker A (IWA) family of ATPases, implicated in a diversity of complex biological functions. Conformational changes typical of IWA ATPases have been postulated to drive these molecular events but have not been demonstrated. We report cryogenic electron microscopy (cryo-EM) structures of ArsA in MgADP-bound and MgATP-bound states, as well as a distinct MgATP-bound state liganded to As. X-ray absorption spectroscopy (XAS) confirmed three-coordinate binding of As to the conserved cysteines at the metalloid-binding site of the closed state. Coupled with biochemical characterization, our cryo-EM structures reveal key conformational changes in the ArsA catalytic cycle consistent with other IWA ATPases and provide the structural basis for allosteric activation of nucleotide hydrolysis by As. This work establishes how the nucleotide state of ArsA transiently creates a high-affinity binding site that can sequester metalloid within the cell, followed by a nucleotide-driven handoff to ArsB for efflux. | ||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 119.4 KB | 表示 | ![]() |
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-検証レポート
文書・要旨 | ![]() | 1.4 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.4 MB | 表示 | |
XML形式データ | ![]() | 34.5 KB | 表示 | |
CIF形式データ | ![]() | 49.4 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
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リンク
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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 63972.004 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 株: ML-04 / 遺伝子: LFML04_2459 / 発現宿主: ![]() ![]() | ||||||
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#2: 化合物 | #3: 化合物 | 研究の焦点であるリガンドがあるか | Y | Has protein modification | N | |
-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
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試料調製
構成要素 | 名称: ArsA open state in complex with MgADP / タイプ: COMPLEX 詳細: ArsA incubated with 2 mM each of MgCl2 and ADP and 5 mM of sodium arsenite for 3 hours Entity ID: #1 / 由来: RECOMBINANT |
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分子量 | 実験値: NO |
由来(天然) | 生物種: ![]() |
由来(組換発現) | 生物種: ![]() ![]() |
緩衝液 | pH: 7.5 |
試料 | 濃度: 10 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: ArsA incubated with 2 mM each of MgCl2 and ADP and 5 mM of sodium arsenite for 3 hours |
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 277 K |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: TFS KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 130000 X / 最大 デフォーカス(公称値): 2500 nm / 最小 デフォーカス(公称値): 500 nm |
試料ホルダ | 凍結剤: NITROGEN |
撮影 | 電子線照射量: 70 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
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解析
EMソフトウェア | 名称: SerialEM / カテゴリ: 画像取得 |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
対称性 | 点対称性: C1 (非対称) |
3次元再構成 | 解像度: 3.4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 103258 / 対称性のタイプ: POINT |