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基本情報
登録情報 | データベース: PDB / ID: 8ae1 | ||||||||||||
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タイトル | Structure of trimeric SlpA outer membrane protein | ||||||||||||
![]() | S-layer protein SlpA | ||||||||||||
![]() | STRUCTURAL PROTEIN / SlpA protein | ||||||||||||
機能・相同性 | ![]() porin activity / pore complex / monoatomic ion transport / cell outer membrane / lipid binding 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: 3.25 Å | ||||||||||||
![]() | von Kuegelgen, A. / Bharat, T.A.M. | ||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: A multidomain connector links the outer membrane and cell wall in phylogenetically deep-branching bacteria. 著者: Andriko von Kügelgen / Sofie van Dorst / Vikram Alva / Tanmay A M Bharat / ![]() ![]() 要旨: is a phylogenetically deep-branching extremophilic bacterium that is remarkably tolerant to numerous environmental stresses, including large doses of ultraviolet (UV) radiation and extreme ... is a phylogenetically deep-branching extremophilic bacterium that is remarkably tolerant to numerous environmental stresses, including large doses of ultraviolet (UV) radiation and extreme temperatures. It can even survive in outer space for several years. This endurance of has been partly ascribed to its atypical cell envelope comprising an inner membrane, a large periplasmic space with a thick peptidoglycan (PG) layer, and an outer membrane (OM) covered by a surface layer (S-layer). Despite intense research, molecular principles governing envelope organization and OM stabilization are unclear in and related bacteria. Here, we report a electron cryomicroscopy (cryo-EM) structure of the abundant OM protein SlpA, showing how its C-terminal segment forms homotrimers of 30-stranded β-barrels in the OM, whereas its N-terminal segment forms long, homotrimeric coiled coils linking the OM to the PG layer via S-layer homology (SLH) domains. Furthermore, using protein structure prediction and sequence-based bioinformatic analysis, we show that SlpA-like putative OM-PG connector proteins are widespread in phylogenetically deep-branching Gram-negative bacteria. Finally, combining our atomic structures with fluorescence and electron microscopy of cell envelopes of wild-type and mutant bacterial strains, we report a model for the cell surface of . Our results will have important implications for understanding the cell surface organization and hyperstability of and related bacteria and the evolutionary transition between Gram-negative and Gram-positive bacteria. | ||||||||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 483.8 KB | 表示 | ![]() |
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PDB形式 | ![]() | 391.2 KB | 表示 | ![]() |
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-検証レポート
文書・要旨 | ![]() | 1.2 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.2 MB | 表示 | |
XML形式データ | ![]() | 78.6 KB | 表示 | |
CIF形式データ | ![]() | 115.6 KB | 表示 | |
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 | ![]() 15378MC 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 ![]() |
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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: 123835.367 Da / 分子数: 3 / 由来タイプ: 天然 / 由来: (天然) ![]() 株: ATCC 13939 / DSM 20539 / JCM 16871 / LMG 4051 / NBRC 15346 / NCIMB 9279 / R1 / VKM B-1422 参照: UniProt: Q9RRB6 #2: 化合物 | ChemComp-CA / 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 |
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試料調製
構成要素 | 名称: Structure of trimeric SlpA protein / タイプ: COMPLEX / 詳細: Structure of trimeric SlpA protein / Entity ID: #1 / 由来: NATURAL | ||||||||||||||||||||
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分子量 | 実験値: NO | ||||||||||||||||||||
由来(天然) | 生物種: ![]() | ||||||||||||||||||||
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: 4.45 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: Purified SlpA protein after size-exclusion chromatography | ||||||||||||||||||||
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 4.5 seconds, Blot force -10,1, Wait time 10 seconds, Drain time 0.5 seconds |
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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 詳細: EPU software with faster acquisition mode AFIS (Aberration Free Image Shift). |
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): 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: 4.8 sec. / 電子線照射量: 47.909 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 撮影したグリッド数: 1 / 実像数: 2294 |
電子光学装置 | エネルギーフィルター名称: GIF Bioquantum / エネルギーフィルタースリット幅: 20 eV |
画像スキャン | 横: 5760 / 縦: 4092 |
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解析
ソフトウェア | 名称: PHENIX / バージョン: 1.19.1_4122: / 分類: 精密化 | ||||||||||||||||||||||||||||||||||||||||||||||||||
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EMソフトウェア |
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画像処理 | 詳細: Movies were clustered into optics groups based on the XML meta-data of the data-collection software EPU (ThermoFisher) using a k-means algorithm implemented in EPU_group_AFIS (https://github. ...詳細: Movies were clustered into optics groups based on the XML meta-data of the data-collection software EPU (ThermoFisher) using a k-means algorithm implemented in EPU_group_AFIS (https://github.com/DustinMorado/EPU_group_AFIS). Imported movies were motion-corrected, dose weighted, and Fourier cropped (2x) with MotionCor2 (Zheng et al., 2017) implemented in RELION3.1 (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: 223878 詳細: Initially, micrographs were denoised using TOPAZ (73) using the UNET neural network and 2893 particles were manually picked. Particle coordinates were used to train TOPAZ picker (74) in 5 ...詳細: Initially, micrographs were denoised using TOPAZ (73) using the UNET neural network and 2893 particles were manually picked. Particle coordinates were used to train TOPAZ picker (74) in 5 times downsampled micrographs with the neural network architecture ResNet8 and picked particles were extracted in 4 times downsampled 128 x 128 boxes and classified using reference-free 2D classification inside RELION3.1. | ||||||||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C3 (3回回転対称) | ||||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.25 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 122412 / アルゴリズム: FOURIER SPACE / クラス平均像の数: 1 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | B value: 51.67 / プロトコル: AB INITIO MODEL / 空間: REAL / Target criteria: Best Fit | ||||||||||||||||||||||||||||||||||||||||||||||||||
拘束条件 |
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