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基本情報
登録情報 | データベース: PDB / ID: 8s6h | ||||||
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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 | ||||||
![]() | TrwL protein | ||||||
![]() | PROTEIN FIBRIL / Conjugal transfer protein / VirB2 / Conjugative pilus / Type-4 secretion system fibre / Conduit for horizontal gene transfer / anti-microbial resistance | ||||||
機能・相同性 | Conjugal transfer TrbC/type IV secretion VirB2 / TrbC/VIRB2 pilin / membrane / 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / TrwL protein![]() | ||||||
生物種 | ![]() ![]() | ||||||
手法 | 電子顕微鏡法 / 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, A.K. / Waksman, G. / Redzej, A. | ||||||
資金援助 | ![]()
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![]() | ![]() 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. | ||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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-関連構造データ
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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: 7396.732 Da / 分子数: 69 / 由来タイプ: 天然 詳細: The first 43 amino acids have been cleaved off from the pro-pilin TrwL/VirB2 during post-translational processing for maturation. 由来: (天然) ![]() ![]() #2: 化合物 | ChemComp-LHG / 研究の焦点であるリガンドがあるか | Y | |
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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: HELICAL ARRAY / 3次元再構成法: らせん対称体再構成法 |
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試料調製
構成要素 | 名称: Conjugative pilus from the E. coli R388 plasmid / タイプ: COMPLEX 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 Entity ID: #1 / 由来: NATURAL | |||||||||||||||||||||||||
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分子量 | 値: 7.39 kDa/nm / 実験値: YES | |||||||||||||||||||||||||
由来(天然) | 生物種: ![]() ![]() | |||||||||||||||||||||||||
緩衝液 | pH: 7.4 / 詳細: Phosphate buffer saline | |||||||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 0.25 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES / 詳細: This specimen was purified to high levels. | |||||||||||||||||||||||||
試料支持 | グリッドの材料: COPPER/PALLADIUM / グリッドのサイズ: 400 divisions/in. / グリッドのタイプ: C-flat-1.2/1.3 | |||||||||||||||||||||||||
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: 277.15 K 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. |
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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: FEI TITAN KRIOS 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. |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 81000 X / 倍率(補正後): 81000 X / 最大 デフォーカス(公称値): 2400 nm / 最小 デフォーカス(公称値): 900 nm / Calibrated defocus min: 900 nm / 最大 デフォーカス(補正後): 2400 nm / Cs: 2.7 mm / アライメント法: COMA FREE |
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER 最高温度: 80 K / 最低温度: 80 K |
撮影 | 電子線照射量: 34.67 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 実像数: 4884 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. |
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解析
EMソフトウェア |
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画像処理 | 詳細: Find more details in the Methods section of the publication | ||||||||||||||||||||||||||||||||||||||||
CTF補正 | 詳細: Find more details in the Methods section of the publication タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||
らせん対称 | 回転角度/サブユニット: 28.983 ° / 軸方向距離/サブユニット: 13.241 Å / らせん対称軸の対称性: C1 | ||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 1158759 詳細: Find more details in the Methods section of the publication | ||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.39 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 209930 詳細: Find more details in the Methods section of the publication クラス平均像の数: 3 / 対称性のタイプ: HELICAL | ||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | B value: 109.7 / プロトコル: RIGID BODY FIT / Target criteria: Cross-correlation in Phenix 詳細: Find more details in the Methods section of the publication | ||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | Source name: AlphaFold / タイプ: in silico model | ||||||||||||||||||||||||||||||||||||||||
精密化 | 交差検証法: NONE 立体化学のターゲット値: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||||||||||||||||||
原子変位パラメータ | Biso mean: 90.07 Å2 | ||||||||||||||||||||||||||||||||||||||||
拘束条件 |
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