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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: 9lyj | ||||||||||||
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| タイトル | Cryo-EM structure of MdtF | ||||||||||||
要素 | Multidrug resistance protein MdtF | ||||||||||||
キーワード | TRANSPORT PROTEIN / Membrane protein / E.coli. / Cryo-EM / Efflux pump. | ||||||||||||
| 機能・相同性 | 機能・相同性情報xenobiotic transmembrane transport / bile acid transmembrane transporter activity / Antimicrobial resistance / bile acid and bile salt transport / efflux transmembrane transporter activity / xenobiotic transmembrane transporter activity / xenobiotic transport / response to toxic substance / response to antibiotic / membrane ...xenobiotic transmembrane transport / bile acid transmembrane transporter activity / Antimicrobial resistance / bile acid and bile salt transport / efflux transmembrane transporter activity / xenobiotic transmembrane transporter activity / xenobiotic transport / response to toxic substance / response to antibiotic / membrane / identical protein binding / plasma 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: 3.14 Å | ||||||||||||
データ登録者 | Dutta, S. / Padmanaban, S. / Fernando, R.C. | ||||||||||||
| 資金援助 | インド, 3件
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引用 | ジャーナル: mBio / 年: 2026タイトル: Cryo-EM reveals the structural heterogeneity and conformational flexibility of multidrug efflux pumps MdtB and MdtF. 著者: Surekha Padmanaban / Clayton Fernando Rencilin / Rupam Biswas / Somnath Dutta / ![]() 要旨: Resistance-nodulation-cell division (RND) efflux pumps are the major cause of multidrug resistance in bacteria, particularly in Gram-negative bacteria. They are complex molecular machines forming ...Resistance-nodulation-cell division (RND) efflux pumps are the major cause of multidrug resistance in bacteria, particularly in Gram-negative bacteria. They are complex molecular machines forming tripartite assemblies that actively transport out a wide range of antimicrobial agents, including antibiotics, biocides, and host defense molecules. However, the presence of multiple RND transporters with overlapping functions in a single bacterium raises questions about their individual functional relevance. In this study, we determined the cryo-electron microscopy (cryo-EM) structures of two distinct hydrophobic and amphiphilic efflux (HAE)-RND transporters from MdtB and MdtF. MdtB transporter is a part of the two-RND subunit system MdtABC. MdtF is a unique class of RND transporter whose expression is regulated by oxygen availability and is crucial for the survival of in anaerobic growth conditions. The cryo-EM structures of MdtB and MdtF reveal a novel conformational state of HAE-RND efflux pumps. While the MdtB structure adopts an intermediate state, MdtF displays structural dynamics in the presence of n-dodecyl-β-D-maltoside (DDM). MdtF at 2.8 Å resolution displayed a significant conformational change in the transmembrane core helices and flexibility in the transmembrane domain. Our findings highlight the significance of the novel structural state during the substrate transport mechanism. Furthermore, our structural analysis provides insights into drug-binding sites and the transport mechanism of these important transporters. IMPORTANCE: Resistance-nodulation-cell division (RND) efflux pumps are mainly responsible for multidrug resistance by extruding a wide range of antibiotics from bacterial cells. These pumps are ...IMPORTANCE: Resistance-nodulation-cell division (RND) efflux pumps are mainly responsible for multidrug resistance by extruding a wide range of antibiotics from bacterial cells. These pumps are frequently overexpressed in multidrug-resistant strains, which are responsible for urinary tract infections and foodborne illnesses. In this current study, we resolved the structures of two hydrophobic and amphiphilic efflux (HAE)-RND transporters, MdtB and MdtF, using single-particle cryo-electron microscopy. Our study demonstrated novel structural states of MdtF during substrate transport. This knowledge provides valuable insights into the conformational transitions underlying substrate transport. Understanding these structural mechanisms fills a critical knowledge gap in the RND-mediated efflux process and lays the groundwork for structure-guided inhibitor design. Our findings contribute to ongoing efforts to develop novel therapeutic strategies to combat multidrug-resistant infections. | ||||||||||||
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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 | 9lyj.cif.gz | 483.7 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9lyj.ent.gz | 394.7 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 9lyj.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
| アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/ly/9lyj ftp://data.pdbj.org/pub/pdb/validation_reports/ly/9lyj | HTTPS FTP |
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-関連構造データ
| 関連構造データ | ![]() 63315MC ![]() 9lyqC 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: 111591.609 Da / 分子数: 3 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() #2: 糖 | 研究の焦点であるリガンドがあるか | Y | 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: 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: Membrane protein MdtF / タイプ: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1 / 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 |
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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: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: OTHER |
| 電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2700 nm / 最小 デフォーカス(公称値): 1200 nm |
| 撮影 | 電子線照射量: 30 e/Å2 フィルム・検出器のモデル: FEI FALCON II (4k x 4k) |
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解析
| EMソフトウェア |
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| CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||
| 3次元再構成 | 解像度: 3.14 Å / 解像度の算出法: OTHER / 粒子像の数: 250000 / 対称性のタイプ: POINT |
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インド, 3件
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FIELD EMISSION GUN