+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 6t72 | |||||||||
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タイトル | Structure of the RsaA N-terminal domain bound to LPS | |||||||||
要素 | S-layer protein | |||||||||
キーワード | STRUCTURAL PROTEIN / S-layer LPS RsaA | |||||||||
機能・相同性 | RsaA N-terminal domain / S-layer / RTX calcium-binding nonapeptide repeat / RTX calcium-binding nonapeptide repeat (4 copies) / Serralysin-like metalloprotease, C-terminal / calcium ion binding / extracellular region / S-layer protein 機能・相同性情報 | |||||||||
生物種 | Caulobacter vibrioides CB15 (バクテリア) | |||||||||
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: 3.7 Å | |||||||||
データ登録者 | von Kuegelgen, A. / Bharat, T.A.M. | |||||||||
資金援助 | 英国, 1件
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引用 | ジャーナル: Cell / 年: 2020 タイトル: In Situ Structure of an Intact Lipopolysaccharide-Bound Bacterial Surface Layer. 著者: Andriko von Kügelgen / Haiping Tang / Gail G Hardy / Danguole Kureisaite-Ciziene / Yves V Brun / Phillip J Stansfeld / Carol V Robinson / Tanmay A M Bharat / 要旨: Most bacterial and all archaeal cells are encapsulated by a paracrystalline, protective, and cell-shape-determining proteinaceous surface layer (S-layer). On Gram-negative bacteria, S-layers are ...Most bacterial and all archaeal cells are encapsulated by a paracrystalline, protective, and cell-shape-determining proteinaceous surface layer (S-layer). On Gram-negative bacteria, S-layers are anchored to cells via lipopolysaccharide. Here, we report an electron cryomicroscopy structure of the Caulobacter crescentus S-layer bound to the O-antigen of lipopolysaccharide. Using native mass spectrometry and molecular dynamics simulations, we deduce the length of the O-antigen on cells and show how lipopolysaccharide binding and S-layer assembly is regulated by calcium. Finally, we present a near-atomic resolution in situ structure of the complete S-layer using cellular electron cryotomography, showing S-layer arrangement at the tip of the O-antigen. A complete atomic structure of the S-layer shows the power of cellular tomography for in situ structural biology and sheds light on a very abundant class of self-assembling molecules with important roles in prokaryotic physiology with marked potential for synthetic biology and surface-display applications. | |||||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 6t72.cif.gz | 63.2 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb6t72.ent.gz | 44.7 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 6t72.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 | 6t72_validation.pdf.gz | 1.1 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 6t72_full_validation.pdf.gz | 1.1 MB | 表示 | |
XML形式データ | 6t72_validation.xml.gz | 15.1 KB | 表示 | |
CIF形式データ | 6t72_validation.cif.gz | 20.4 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/t7/6t72 ftp://data.pdbj.org/pub/pdb/validation_reports/t7/6t72 | HTTPS FTP |
-関連構造データ
-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: 25820.354 Da / 分子数: 1 / 変異: TEV site added at the position 250 / 由来タイプ: 組換発現 / 詳細: LPS O-antigen bound to protein 由来: (組換発現) Caulobacter vibrioides CB15 (バクテリア) 遺伝子: rsaA, CC_1007 / 発現宿主: Caulobacter vibrioides CB15 (バクテリア) / 参照: UniProt: P35828 | ||
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#2: 多糖 | 4-acetamido-4,6-dideoxy-alpha-D-mannopyranose-(1-3)-4-acetamido-4,6-dideoxy-alpha-D-mannopyranose- ...4-acetamido-4,6-dideoxy-alpha-D-mannopyranose-(1-3)-4-acetamido-4,6-dideoxy-alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-3)-4-acetamido-4,6-dideoxy-alpha-D-mannopyranose-(1-3)-4-acetamido-4,6-dideoxy-alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-3)-4-acetamido-4,6-dideoxy-alpha-D-mannopyranose-(1-3)-4-acetamido-4,6-dideoxy-alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-3)-4-acetamido-4,6-dideoxy-alpha-D-mannopyranose-(1-3)-4-acetamido-4,6-dideoxy-alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose | ||
#3: 化合物 | 研究の焦点であるリガンドがあるか | Y | |
-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: Structure of RsaA N-terminal domain bound to LPS / タイプ: COMPLEX / 詳細: Structure of RsaA N-terminal domain bound to LPS / Entity ID: #1 / 由来: NATURAL | |||||||||||||||||||||||||
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分子量 | 値: 0.577 MDa / 実験値: YES | |||||||||||||||||||||||||
由来(天然) | 生物種: Caulobacter vibrioides CB15 (バクテリア) / 株: YB1001 | |||||||||||||||||||||||||
緩衝液 | pH: 7.5 詳細: Buffer solutions were prepared fresh from sterile filtered concentrated stocksolutions. Solutions were filtered through a 0.22 um filter to avoid microbial contamination and degassed using a ...詳細: Buffer solutions were prepared fresh from sterile filtered concentrated stocksolutions. Solutions were filtered through a 0.22 um filter to avoid microbial contamination and degassed using a vacuum fold pump. The pH of the HEPES stock solution was adjusted with sodium hydroxide at 4 deg C. | |||||||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 2.5 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES / 詳細: RsaA N-terminal domain with LPS | |||||||||||||||||||||||||
試料支持 | 詳細: 20 seconds, 15 mA / グリッドの材料: COPPER/RHODIUM / グリッドのサイズ: 200 divisions/in. / グリッドのタイプ: Quantifoil R2/2 | |||||||||||||||||||||||||
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: 283.15 K 詳細: Vitrobot options: Blot time 3 seconds, Blot force -13,1, Wait time 10 seconds, Drain time 0.5 seconds, |
-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: EPU software |
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 / 倍率(公称値): 130000 X / 倍率(補正後): 130000 X / 最大 デフォーカス(公称値): -4000 nm / 最小 デフォーカス(公称値): -1000 nm / Calibrated defocus min: -1000 nm / 最大 デフォーカス(補正後): -4000 nm / Cs: 2.7 mm / C2レンズ絞り径: 50 µm / アライメント法: ZEMLIN TABLEAU |
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: 70 K / 最低温度: 70 K |
撮影 | 平均露光時間: 8 sec. / 電子線照射量: 43 e/Å2 / 検出モード: COUNTING フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 撮影したグリッド数: 1 / 実像数: 2422 詳細: Images were collected in movie-mode and subjected to 8 seconds of exposure where a total dose of 43 e-/A2 was applied, and 20 frames were recorded per movie. |
電子光学装置 | エネルギーフィルター名称: GIF Quantum LS / エネルギーフィルタースリット幅: 20 eV |
画像スキャン | 横: 3838 / 縦: 3710 / 動画フレーム数/画像: 20 / 利用したフレーム数/画像: 1-20 |
-解析
EMソフトウェア |
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画像処理 | 詳細: Movies were motion corrected and dose weighted with MotionCor2 (Zheng et al., 2017) implemented in Relion 3.0 (Zivanov et al., 2018). Contrast transfer functions (CTFs) of the resulting ...詳細: Movies were motion corrected and dose weighted with MotionCor2 (Zheng et al., 2017) implemented in Relion 3.0 (Zivanov et al., 2018). Contrast transfer functions (CTFs) of the resulting motion corrected micrographs were estimated using CTFFIND4 (Rohou and Grigorieff, 2015). | ||||||||||||||||||||||||||||||||||||||||||||||||||
CTF補正 | 詳細: RELION refinement with in-built CTF correction. The function is similar to a Wiener filter, so amplitude correction included. タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 129633 詳細: Particles were automatically picked from the motion and CTF corrected micrographs using the AutoPick function in Relion 3.0 (Zivanov et al., 2018). As particle reference a 3 dimensional ...詳細: Particles were automatically picked from the motion and CTF corrected micrographs using the AutoPick function in Relion 3.0 (Zivanov et al., 2018). As particle reference a 3 dimensional reconstruction from an earlier dataset with different pixelsize was used which was reconstructed using an unbiased subtomogram average structure of the same sample. | ||||||||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C1 (非対称) | ||||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.7 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 115776 / アルゴリズム: FOURIER SPACE 詳細: Particles from two main 3D classes containing 21 or 20 RsaA subunits were combined for a focused 3D auto refinement on the central 14 subunits using the output from the 3D classification as a ...詳細: Particles from two main 3D classes containing 21 or 20 RsaA subunits were combined for a focused 3D auto refinement on the central 14 subunits using the output from the 3D classification as a starting model. The final map was obtained from 115,776 particles and post-processed using a soft mask focused on the inner fourteen subunits. クラス平均像の数: 2 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | B value: 85.819 / プロトコル: BACKBONE TRACE / 空間: RECIPROCAL / Target criteria: Best fit 詳細: The carbon backbone of the RsaA protein was manually traced through a single subunit of the cryo-EM density using Coot (Emsley et al., 2010). Initially, side chains were assigned in regions ...詳細: The carbon backbone of the RsaA protein was manually traced through a single subunit of the cryo-EM density using Coot (Emsley et al., 2010). Initially, side chains were assigned in regions with density corresponding to characteristic aromatic residues allowing us to deduce the register of the amino acid sequence in the map. Side chains for residues 2-243 of RsaA were thus assigned unambiguously and the structure was refined and manually rebuilt using Refmac5 (Murshudov et al., 2011) inside the CCP-EM (Burnley et al., 2017) software suite and Coot. |