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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: 9v5h | |||||||||||||||
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| タイトル | cryo-EM structure of hexameric ArnA | |||||||||||||||
要素 | (Bifunctional polymyxin resistance protein ArnA) x 2 | |||||||||||||||
キーワード | TRANSFERASE / Lipid A modification Polymyxin resistance Bifunctional enzyme UDP-glucuronic acid dehydrogenase UDP-4-amino-4-deoxy-L-arabinose / transferase Lipopolysaccharide biosynthesis Antibiotic resistance Aminotransferase Dehydrogenase LPS modification pathway L-Ara4N biosynthesis | |||||||||||||||
| 機能・相同性 | 機能・相同性情報UDP-4-deoxy-4-formamido-beta-L-arabinopyranose biosynthetic process / UDP-glucuronate dehydrogenase activity / UDP-4-amino-4-deoxy-L-arabinose formyltransferase activity / UDP-glucuronic acid dehydrogenase (UDP-4-keto-hexauronic acid decarboxylating) / UDP-4-amino-4-deoxy-L-arabinose formyltransferase / UDP-D-xylose biosynthetic process / UDP-glucuronate decarboxylase activity / lipopolysaccharide biosynthetic process / lipid A biosynthetic process / NAD+ binding ...UDP-4-deoxy-4-formamido-beta-L-arabinopyranose biosynthetic process / UDP-glucuronate dehydrogenase activity / UDP-4-amino-4-deoxy-L-arabinose formyltransferase activity / UDP-glucuronic acid dehydrogenase (UDP-4-keto-hexauronic acid decarboxylating) / UDP-4-amino-4-deoxy-L-arabinose formyltransferase / UDP-D-xylose biosynthetic process / UDP-glucuronate decarboxylase activity / lipopolysaccharide biosynthetic process / lipid A biosynthetic process / NAD+ binding / response to antibiotic / protein-containing complex / identical protein binding / membrane 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: 4 Å | |||||||||||||||
データ登録者 | Caliseki, M. / Borucu, U. / Kadapalakere, S.Y. / Schaffitzel, C. / Kabasakal, B.V. | |||||||||||||||
| 資金援助 | 英国, トルコ, 4件
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引用 | ジャーナル: Acta Crystallogr D Struct Biol / 年: 2025タイトル: Off-target structural insights: ArnA and AcrB in bacterial membrane-protein cryo-EM analysis. 著者: Mehmet Caliseki / Ufuk Borucu / Sathish K N Yadav / Christiane Schaffitzel / Burak Veli Kabasakal / ![]() 要旨: Membrane-protein quality control in Escherichia coli involves coordinated actions of the AAA+ protease FtsH, the insertase YidC and the regulatory complex HflKC. These systems maintain proteostasis ...Membrane-protein quality control in Escherichia coli involves coordinated actions of the AAA+ protease FtsH, the insertase YidC and the regulatory complex HflKC. These systems maintain proteostasis by facilitating membrane-protein insertion, folding and degradation. To gain structural insights into a putative complex formed by FtsH and YidC, we performed single-particle cryogenic electron microscopy on detergent-solubilized membrane samples, from which FtsH and YidC were purified using Ni-NTA affinity and size-exclusion chromatography. Although SDS-PAGE analysis indicated high purity of these proteins, cryo-EM data sets unexpectedly yielded high-resolution structures of ArnA and AcrB at 4.0 and 2.9 Å resolution, respectively. ArnA is a bifunctional enzyme involved in lipid A modification and polymyxin resistance, while AcrB is a multidrug efflux transporter of the AcrAB-TolC system. ArnA and AcrB, known Ni-NTA purification contaminants, were also consistently detected by mass spectrometry in Strep-Tactin affinity-purified samples, validating their presence independently of affinity-tag selection. ArnA, which is typically cytoplasmic, was consistently found in membrane-isolated samples, indicating an association with membrane components. Only 2D class averages corresponding to the cytoplasmic AAA+ domain of FtsH were observed; neither side views of full-length FtsH nor densities corresponding to an intact FtsH-YidC complex could be identified, due to the conformational flexibility of the FtsH complex and its transient interaction with YidC, which limited particle alignment and stable classification in cryo-EM data sets. Two-dimensional class averages revealed additional particles resembling GroEL and cytochrome bo oxidase. These results underscore the utility of cryo-EM in uncovering off-target yet structurally well defined complexes, which may reflect physiologically relevant interactions or purification biases during membrane-protein overexpression. #1: ジャーナル: Biorxiv / 年: 2025タイトル: Off-Target Structural Insights: ArnA and AcrB in Bacterial Membrane Protein Cryo-EM Analysis 著者: Caliseki, M. / Borucu, U. / Yadav, S.K.N. / Schaffitzel, C. / Kabasakal, B.V. | |||||||||||||||
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構造の表示
| 構造ビューア | 分子: Molmil Jmol/JSmol |
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ダウンロードとリンク
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ダウンロード
| PDBx/mmCIF形式 | 9v5h.cif.gz | 629.6 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9v5h.ent.gz | 528.9 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 9v5h.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
| その他 | その他のダウンロード |
-検証レポート
| 文書・要旨 | 9v5h_validation.pdf.gz | 1.3 MB | 表示 | wwPDB検証レポート |
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| 文書・詳細版 | 9v5h_full_validation.pdf.gz | 1.4 MB | 表示 | |
| XML形式データ | 9v5h_validation.xml.gz | 112.1 KB | 表示 | |
| CIF形式データ | 9v5h_validation.cif.gz | 169.3 KB | 表示 | |
| アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/v5/9v5h ftp://data.pdbj.org/pub/pdb/validation_reports/v5/9v5h | HTTPS FTP |
-関連構造データ
| 関連構造データ | ![]() 64789MC ![]() 9v5rC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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| 類似構造データ | 類似検索 - 機能・相同性 F&H 検索 |
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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: 32717.416 Da / 分子数: 6 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() 参照: UniProt: P77398, UDP-4-amino-4-deoxy-L-arabinose formyltransferase, UDP-glucuronic acid dehydrogenase (UDP-4-keto-hexauronic acid decarboxylating) #2: タンパク質 | 分子量: 39744.215 Da / 分子数: 6 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() 参照: UniProt: P77398, UDP-4-amino-4-deoxy-L-arabinose formyltransferase, UDP-glucuronic acid dehydrogenase (UDP-4-keto-hexauronic acid decarboxylating) Has protein modification | N | |
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-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: CELL / 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: Hexameric Bifunctional polymyxin resistance protein ArnA タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT |
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| 由来(天然) | 生物種: ![]() |
| 由来(組換発現) | 生物種: ![]() |
| 緩衝液 | pH: 7.5 |
| 試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
| 急速凍結 | 凍結剤: ETHANE-PROPANE |
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電子顕微鏡撮影
| 実験機器 | ![]() モデル: Talos Arctica / 画像提供: FEI Company |
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| 顕微鏡 | モデル: FEI TALOS ARCTICA |
| 電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 200 kV / 照射モード: FLOOD BEAM |
| 電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2200 nm / 最小 デフォーカス(公称値): 700 nm |
| 撮影 | 電子線照射量: 60.6 e/Å2 フィルム・検出器のモデル: GATAN K2 QUANTUM (4k x 4k) |
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解析
| EMソフトウェア | 名称: PHENIX / バージョン: 1.21.2_5419: / カテゴリ: モデル精密化 | ||||||||||||||||||||||||
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| CTF補正 | タイプ: NONE | ||||||||||||||||||||||||
| 3次元再構成 | 解像度: 4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 74212 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
| 原子モデル構築 | プロトコル: RIGID BODY FIT | ||||||||||||||||||||||||
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ムービー
コントローラー
万見について






英国,
トルコ, 4件
引用





PDBj

FIELD EMISSION GUN