+
データを開く
-
基本情報
登録情報 | ![]() | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
タイトル | Cryo-EM Structure of the R388 plasmid conjugative pilus reveals a helical polymer characterised by an unusual pilin/phospholipid binary complex | |||||||||
![]() | Sharpened map of the R388 Pilus filament generated using cryosparc | |||||||||
![]() |
| |||||||||
![]() | Conjugal transfer protein / VirB2 / Conjugative pilus / Type-4 secretion system fibre / Conduit for horizontal gene transfer / anti-microbial resistance / PROTEIN FIBRIL | |||||||||
機能・相同性 | Conjugal transfer TrbC/type IV secretion VirB2 / TrbC/VIRB2 pilin / membrane / TrwL protein![]() | |||||||||
生物種 | ![]() ![]() ![]() ![]() | |||||||||
手法 | らせん対称体再構成法 / クライオ電子顕微鏡法 / 解像度: 3.39 Å | |||||||||
![]() | Vadakkepat AK / Waksman G / Redzej A | |||||||||
資金援助 | ![]()
| |||||||||
![]() | ![]() タイトル: Cryo-EM structure of the R388 plasmid conjugative pilus reveals a helical polymer characterized by an unusual pilin/phospholipid binary complex. 著者: Abhinav K Vadakkepat / Songlin Xue / Adam Redzej / Terry K Smith / Brian T Ho / Gabriel Waksman / ![]() 要旨: Bacterial conjugation is a process by which DNA is transferred unidirectionally from a donor cell to a recipient cell. It is the main means by which antibiotic resistance genes spread among bacterial ...Bacterial conjugation is a process by which DNA is transferred unidirectionally from a donor cell to a recipient cell. It is the main means by which antibiotic resistance genes spread among bacterial populations. It is crucially dependent upon the elaboration of an extracellular appendage, termed "pilus," by a large double-membrane-spanning secretion system termed conjugative "type IV secretion system." Here we present the structure of the conjugative pilus encoded by the R388 plasmid. We demonstrate that, as opposed to all conjugative pili produced so far for cryoelectron microscopy (cryo-EM) structure determination, the conjugative pilus encoded by the R388 plasmid is greatly stimulated by the presence of recipient cells. Comparison of its cryo-EM structure with existing conjugative pilus structures highlights a number of important differences between the R388 pilus structure and that of its homologs, the most prominent being the highly distinctive conformation of its bound lipid. | |||||||||
履歴 |
|
-
構造の表示
添付画像 |
---|
-
ダウンロードとリンク
-EMDBアーカイブ
マップデータ | ![]() | 230.1 MB | ![]() | |
---|---|---|---|---|
ヘッダ (付随情報) | ![]() ![]() | 21.7 KB 21.7 KB | 表示 表示 | ![]() |
FSC (解像度算出) | ![]() | 18.3 KB | 表示 | ![]() |
画像 | ![]() | 159.5 KB | ||
Filedesc metadata | ![]() | 6.7 KB | ||
その他 | ![]() ![]() | 226.4 MB 226.4 MB | ||
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
関連構造データ | ![]() 8s6hMC M: このマップから作成された原子モデル C: 同じ文献を引用 ( |
---|---|
類似構造データ | 類似検索 - 機能・相同性 ![]() |
-
リンク
EMDBのページ | ![]() ![]() |
---|
-
マップ
ファイル | ![]() | ||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
注釈 | Sharpened map of the R388 Pilus filament generated using cryosparc | ||||||||||||||||||||||||||||||||||||
投影像・断面図 | 画像のコントロール
画像は Spider により作成 | ||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 1.067 Å | ||||||||||||||||||||||||||||||||||||
密度 |
| ||||||||||||||||||||||||||||||||||||
対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
|
-添付データ
-ハーフマップ: Halfmap-B of the R388 Pilus filament generated using...
ファイル | emd_19758_half_map_1.map | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
注釈 | Halfmap-B of the R388 Pilus filament generated using cryosparc and used to calculate the FSC curve using LocalResolution in Cryosparc. The resulting FSC curve shown in the associated publication. | ||||||||||||
投影像・断面図 |
| ||||||||||||
密度ヒストグラム |
-ハーフマップ: Halfmap-A of the R388 Pilus filament generated using...
ファイル | emd_19758_half_map_2.map | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
注釈 | Halfmap-A of the R388 Pilus filament generated using cryosparc and used to calculate the FSC curve using LocalResolution in Cryosparc. The resulting FSC curve shown in the associated publication. | ||||||||||||
投影像・断面図 |
| ||||||||||||
密度ヒストグラム |
-
試料の構成要素
-全体 : Conjugative pilus from the E. coli R388 plasmid
全体 | 名称: Conjugative pilus from the E. coli R388 plasmid |
---|---|
要素 |
|
-超分子 #1: Conjugative pilus from the E. coli R388 plasmid
超分子 | 名称: Conjugative pilus from the E. coli R388 plasmid / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1 詳細: Helical filament called the conjugative pilus. This is part of the type-4 secretion system. Monomeric unit of the complex comprises of the protein VirB2/TrwL (for R388 pilus) and a lipid PG 32.1 |
---|---|
由来(天然) | 生物種: ![]() ![]() |
分子量 | 理論値: 7.39 kDa/nm |
-分子 #1: TrwL protein
分子 | 名称: TrwL protein / タイプ: protein_or_peptide / ID: 1 詳細: The first 43 amino acids have been cleaved off from the pro-pilin TrwL/VirB2 during post-translational processing for maturation. コピー数: 69 / 光学異性体: LEVO |
---|---|
由来(天然) | 生物種: ![]() ![]() |
分子量 | 理論値: 7.396732 KDa |
配列 | 文字列: AQGLEKARSV LETLQQELTT IVPIAAAVIL LCLGIAYAGR FIEKDTFVRW SIGVIIAGSA VQITAMLFT UniProtKB: TrwL protein |
-分子 #2: 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE
分子 | 名称: 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / タイプ: ligand / ID: 2 / コピー数: 69 / 式: LHG |
---|---|
分子量 | 理論値: 722.97 Da |
Chemical component information | ![]() ChemComp-LHG: |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
---|---|
![]() | らせん対称体再構成法 |
試料の集合状態 | helical array |
-
試料調製
濃度 | 0.25 mg/mL | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
緩衝液 | pH: 7.4 構成要素:
詳細: Phosphate buffer saline | |||||||||||||||
グリッド | モデル: C-flat-1.2/1.3 / 材質: COPPER/PALLADIUM / メッシュ: 400 / 支持フィルム - 材質: GRAPHENE OXIDE / 支持フィルム - トポロジー: CONTINUOUS / 支持フィルム - Film thickness: 100 / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 時間: 30 sec. | |||||||||||||||
凍結 | 凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 277.15 K / 装置: FEI VITROBOT MARK IV 詳細: C-flat grids (Protochips, US 1.2/1.3 400 mesh) were negatively glow discharged using PELCO Easiglow (Ted Pella, USA) and coated with graphene oxide. 3 microliter of the purified pili sample ...詳細: C-flat grids (Protochips, US 1.2/1.3 400 mesh) were negatively glow discharged using PELCO Easiglow (Ted Pella, USA) and coated with graphene oxide. 3 microliter of the purified pili sample was applied on each grid and a Vitrobot Mark IV (Thermo Fisher Scientific, USA) operating at 4C and 100 percent humidity was used to incubate the sample on the grid for 30 secs and blotting for 16 secs (blot force -10) prior to vitrification in liquid ethane.. | |||||||||||||||
詳細 | This specimen was purified to high levels. |
-
電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
---|---|
温度 | 最低: 80.0 K / 最高: 80.0 K |
詳細 | The R388 pilus data were collected at the ISMB Birkbeck EM facility using a Titan Krios microscope (Thermo Fisher Scientific, USA) operated at 300 keV and equipped with a BioQuantum energy filter (Gatan, USA) with a slit width of 20 eV. The images were collected with a post-GIF K3 direct electron detector (Gatan, USA) operating in super resolution mode, at a magnification of 81,000 corresponding to a pixel size of 1.067 A. The dose rate was set to 14.62 e per pixel per second and a total dose of 34.67 e per A2 was fractionated over 50 frames. |
撮影 | フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 実像数: 4884 / 平均電子線量: 34.67 e/Å2 詳細: The R388 pilus data were collected at the ISMB Birkbeck EM facility using a Titan Krios microscope (Thermo Fisher Scientific, USA) operated at 300 keV and equipped with a BioQuantum energy ...詳細: The R388 pilus data were collected at the ISMB Birkbeck EM facility using a Titan Krios microscope (Thermo Fisher Scientific, USA) operated at 300 keV and equipped with a BioQuantum energy filter (Gatan, USA) with a slit width of 20 eV. The images were collected with a post-GIF K3 direct electron detector (Gatan, USA) operating in super resolution mode, at a magnification of 81,000 corresponding to a pixel size of 1.067 A. The dose rate was set to 14.62 e per pixel per second and a total dose of 34.67 e per A2 was fractionated over 50 frames. Data were collected using the EPU software with a defocus range 0.9 micrometer to 2.4 micrometer and a total of 4884 movies were collected. |
電子線 | 加速電圧: 300 kV / 電子線源: ![]() |
電子光学系 | 最大 デフォーカス(補正後): 2.4 µm / 最小 デフォーカス(補正後): 0.9 µm / 倍率(補正後): 81000 / 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / Cs: 2.7 mm / 最大 デフォーカス(公称値): 2.4 µm / 最小 デフォーカス(公称値): 0.9 µm / 倍率(公称値): 81000 |
試料ステージ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER ホルダー冷却材: NITROGEN |
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
+
画像解析
-原子モデル構築 1
初期モデル | Chain - Source name: AlphaFold / Chain - Initial model type: in silico model |
---|---|
詳細 | Find more details in the Methods section of the publication |
精密化 | プロトコル: RIGID BODY FIT / 温度因子: 109.7 / 当てはまり具合の基準: Cross-correlation in Phenix |
得られたモデル | ![]() PDB-8s6h: |