+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 8dew | ||||||
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タイトル | Cryo-electron microscopy structure of Neisseria gonorrhoeae multidrug efflux pump MtrD with LL-37 complex | ||||||
要素 |
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キーワード | MEMBRANE PROTEIN / MtrD complex / multidrug efflux pump / Neisseria gonorrhoeae | ||||||
機能・相同性 | 機能・相同性情報 cytolysis / killing by host of symbiont cells / neutrophil activation / specific granule / cellular response to peptidoglycan / cellular response to interleukin-6 / Antimicrobial peptides / xenobiotic transport / efflux transmembrane transporter activity / cellular response to interleukin-1 ...cytolysis / killing by host of symbiont cells / neutrophil activation / specific granule / cellular response to peptidoglycan / cellular response to interleukin-6 / Antimicrobial peptides / xenobiotic transport / efflux transmembrane transporter activity / cellular response to interleukin-1 / innate immune response in mucosa / cell projection / lipopolysaccharide binding / specific granule lumen / positive regulation of angiogenesis / antimicrobial humoral immune response mediated by antimicrobial peptide / tertiary granule lumen / antibacterial humoral response / cellular response to tumor necrosis factor / cellular response to lipopolysaccharide / defense response to Gram-negative bacterium / amyloid fibril formation / defense response to Gram-positive bacterium / defense response to bacterium / positive regulation of protein phosphorylation / innate immune response / positive regulation of cell population proliferation / Neutrophil degranulation / extracellular space / extracellular exosome / extracellular region / plasma membrane 類似検索 - 分子機能 | ||||||
生物種 | Neisseria gonorrhoeae (淋菌) Homo sapiens (ヒト) | ||||||
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: 2.89 Å | ||||||
データ登録者 | Lyu, M. / Yu, E.W. | ||||||
資金援助 | 米国, 1件
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引用 | ジャーナル: Microbiol Spectr / 年: 2022 タイトル: Structural Basis of Peptide-Based Antimicrobial Inhibition of a Resistance-Nodulation-Cell Division Multidrug Efflux Pump. 著者: Meinan Lyu / Julio C Ayala / Isabella Chirakos / Chih-Chia Su / William M Shafer / Edward W Yu / 要旨: Bacterial efflux pumps in the resistance-nodulation-cell division (RND) family of Gram-negative bacteria contribute significantly to the development of antimicrobial resistance by many pathogens. In ...Bacterial efflux pumps in the resistance-nodulation-cell division (RND) family of Gram-negative bacteria contribute significantly to the development of antimicrobial resistance by many pathogens. In this study, we selected the MtrD transporter protein of Neisseria gonorrhoeae as it is the sole RND pump possessed by this strictly human pathogen and can export multiple antimicrobials, including antibiotics, bile salts, detergents, dyes, and antimicrobial peptides. Using knowledge from our previously published structures of MtrD in the presence or absence of bound antibiotics as a model and the known ability of MtrCDE to export cationic antimicrobial peptides, we hypothesized that cationic peptides could be accommodated within MtrD binding sites. Furthermore, we thought that MtrD-bound peptides lacking antibacterial action could sensitize bacteria to an antibiotic normally exported by the MtrCDE efflux pump or other similar RND-type pumps possessed by different Gram-negative bacteria. We now report the identification of a novel nonantimicrobial cyclic cationic antimicrobial peptide, which we termed CASP (ationic ntibiotic-ensitizing eptide). By single-particle cryo-electron microscopy, we found that CASP binds within the periplasmic cleft region of MtrD using overlapping and distinct amino acid contact sites that interact with another cyclic peptide (colistin) or a linear human cationic antimicrobial peptide derived from human LL-37. While CASP could not sensitize Neisseria gonorrhoeae to an antibiotic (novobiocin) that is a substrate for RND pumps, it could do so against multiple Gram-negative, rod-shaped bacteria. We propose that CASP (or future derivatives) could serve as an adjuvant for the antibiotic treatment of certain Gram-negative infections previously thwarted by RND transporters. RND efflux pumps can export numerous antimicrobials that enter Gram-negative bacteria, and their action can reduce the efficacy of antibiotics and provide decreased susceptibility to various host antimicrobials. Here, we identified a ationic ntibiotic-ensitizing eptide (CASP) that binds within the periplasmic cleft of an RND transporter protein (MtrD) produced by Neisseria gonorrhoeae. Surprisingly, CASP was able to render rod-shaped Gram-negative bacteria, but not gonococci, susceptible to an antibiotic that is a substrate for the gonococcal MtrCDE efflux pump. CASP (or its future derivatives) could be used as an adjuvant to treat infections for which RND efflux contributes to multidrug resistance. | ||||||
履歴 |
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-構造の表示
構造ビューア | 分子: MolmilJmol/JSmol |
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-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 8dew.cif.gz | 995.5 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb8dew.ent.gz | 835 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 8dew.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 | 8dew_validation.pdf.gz | 1.9 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 8dew_full_validation.pdf.gz | 1.9 MB | 表示 | |
XML形式データ | 8dew_validation.xml.gz | 97.5 KB | 表示 | |
CIF形式データ | 8dew_validation.cif.gz | 145.6 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/de/8dew ftp://data.pdbj.org/pub/pdb/validation_reports/de/8dew | HTTPS FTP |
-関連構造データ
関連構造データ | 27401MC 8deuC 8devC 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 (文献) |
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類似構造データ | 類似検索 - 機能・相同性F&H 検索 |
-リンク
-集合体
登録構造単位 |
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1 |
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-要素
#1: タンパク質 | 分子量: 113932.469 Da / 分子数: 3 / 由来タイプ: 組換発現 / 由来: (組換発現) Neisseria gonorrhoeae (淋菌) / 遺伝子: mtrD / 発現宿主: Escherichia coli BL21(DE3) (大腸菌) / 参照: UniProt: A0A6V7GUB3 #2: タンパク質・ペプチド | | 分子量: 2050.516 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: CAMP, CAP18, FALL39, HSD26 / 発現宿主: Escherichia coli BL21(DE3) (大腸菌) / 参照: UniProt: P49913 #3: 化合物 | ChemComp-PTY / 研究の焦点であるリガンドがあるか | 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 |
-試料調製
構成要素 | 名称: Multidrug efflux pump MtrD with LL37 (17-32) peptide complex タイプ: COMPLEX / Entity ID: #1-#2 / 由来: MULTIPLE SOURCES | ||||||||||||
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由来(天然) |
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由来(組換発現) | 生物種: Escherichia coli BL21(DE3) (大腸菌) | ||||||||||||
緩衝液 | pH: 7.5 | ||||||||||||
試料 | 濃度: 0.7 mg/ml / 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 |
-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: FEI TITAN KRIOS |
電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 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): 2250 nm / 最小 デフォーカス(公称値): 1000 nm / C2レンズ絞り径: 100 µm |
撮影 | 平均露光時間: 2.6 sec. / 電子線照射量: 40 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 撮影したグリッド数: 1 / 実像数: 8728 |
-解析
ソフトウェア | 名称: PHENIX / バージョン: 1.19.2_4158: / 分類: 精密化 | ||||||||||||||||||||||||
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3次元再構成 | 解像度: 2.89 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 428882 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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