+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 8c8r | |||||||||
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タイトル | In situ structure of the Nitrosopumilus maritimus S-layer - Composite map between C2 and C6 | |||||||||
要素 | Cell surface protein | |||||||||
キーワード | STRUCTURAL PROTEIN / Nmar_1547 S-layer | |||||||||
機能・相同性 | membrane / Uncharacterized protein 機能・相同性情報 | |||||||||
生物種 | Nitrosopumilus maritimus SCM1 (古細菌) | |||||||||
手法 | 電子顕微鏡法 / サブトモグラム平均法 / クライオ電子顕微鏡法 / 解像度: 3.5 Å | |||||||||
データ登録者 | von Kuegelgen, A. / Bharat, T. | |||||||||
資金援助 | 英国, 2件
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引用 | ジャーナル: Nature / 年: 2024 タイトル: Membraneless channels sieve cations in ammonia-oxidizing marine archaea. 著者: Andriko von Kügelgen / C Keith Cassidy / Sofie van Dorst / Lennart L Pagani / Christopher Batters / Zephyr Ford / Jan Löwe / Vikram Alva / Phillip J Stansfeld / Tanmay A M Bharat / 要旨: Nitrosopumilus maritimus is an ammonia-oxidizing archaeon that is crucial to the global nitrogen cycle. A critical step for nitrogen oxidation is the entrapment of ammonium ions from a dilute marine ...Nitrosopumilus maritimus is an ammonia-oxidizing archaeon that is crucial to the global nitrogen cycle. A critical step for nitrogen oxidation is the entrapment of ammonium ions from a dilute marine environment at the cell surface and their subsequent channelling to the cell membrane of N. maritimus. Here we elucidate the structure of the molecular machinery responsible for this process, comprising the surface layer (S-layer), using electron cryotomography and subtomogram averaging from cells. We supplemented our in situ structure of the ammonium-binding S-layer array with a single-particle electron cryomicroscopy structure, revealing detailed features of this immunoglobulin-rich and glycan-decorated S-layer. Biochemical analyses showed strong ammonium binding by the cell surface, which was lost after S-layer disassembly. Sensitive bioinformatic analyses identified similar S-layers in many ammonia-oxidizing archaea, with conserved sequence and structural characteristics. Moreover, molecular simulations and structure determination of ammonium-enriched specimens enabled us to examine the cation-binding properties of the S-layer, revealing how it concentrates ammonium ions on its cell-facing side, effectively acting as a multichannel sieve on the cell membrane. This in situ structural study illuminates the biogeochemically essential process of ammonium binding and channelling, common to many marine microorganisms that are fundamental to the nitrogen cycle. | |||||||||
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 | 8c8r.cif.gz | 1.4 MB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb8c8r.ent.gz | 1.1 MB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 8c8r.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 | 8c8r_validation.pdf.gz | 905.5 KB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 8c8r_full_validation.pdf.gz | 1012.2 KB | 表示 | |
XML形式データ | 8c8r_validation.xml.gz | 210.4 KB | 表示 | |
CIF形式データ | 8c8r_validation.cif.gz | 318.3 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/c8/8c8r ftp://data.pdbj.org/pub/pdb/validation_reports/c8/8c8r | HTTPS FTP |
-関連構造データ
関連構造データ | 16492MC 8c8kC 8c8lC 8c8mC 8c8nC 8c8oC 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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-要素
#1: タンパク質 | 分子量: 183156.000 Da / 分子数: 6 / 由来タイプ: 天然 / 由来: (天然) Nitrosopumilus maritimus SCM1 (古細菌) / 株: SCM1 / 参照: UniProt: A9A4Y9 |
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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: CELL / 3次元再構成法: サブトモグラム平均法 |
-試料調製
構成要素 | 名称: Nitrosopumilus maritimus S-layer / タイプ: ORGANELLE OR CELLULAR COMPONENT / 詳細: Nitrosopumilus maritimus S-layer C2 symmetrised / Entity ID: all / 由来: NATURAL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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分子量 | 実験値: NO | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
由来(天然) | 生物種: Nitrosopumilus maritimus SCM1 (古細菌) / 株: SCM1 / 細胞内の位置: extracellular | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
緩衝液 | pH: 7.4 / 詳細: Modified Syntheic Crenarchaeota medium | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
緩衝液成分 |
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試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES / 詳細: Nitrosopumilus maritimus cells | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
試料支持 | 詳細: 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: NITROGEN / 湿度: 100 % / 凍結前の試料温度: 283.15 K 詳細: absorption for 60 sec and blotted for 5 sec with blot force -10 |
-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 / 倍率(公称値): 105000 X / 倍率(補正後): 105000 X / 最大 デフォーカス(公称値): 5000 nm / 最小 デフォーカス(公称値): 2000 nm / Calibrated defocus min: 2000 nm / 最大 デフォーカス(補正後): 5000 nm / Cs: 2.7 mm / C2レンズ絞り径: 70 µm / 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: 70 K / 最低温度: 70 K |
撮影 | 平均露光時間: 0.9 sec. / 電子線照射量: 2.96 e/Å2 / Avg electron dose per subtomogram: 121 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) 実像数: 1 / 詳細: Dose-symmetric tilt scheme (Hagen et al, JSB) |
電子光学装置 | エネルギーフィルター名称: GIF Quantum LS / 色収差補正装置: not used / エネルギーフィルタースリット幅: 20 eV / 球面収差補正装置: not used |
画像スキャン | 動画フレーム数/画像: 10 / 利用したフレーム数/画像: 1-10 |
-解析
EMソフトウェア |
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画像処理 | 詳細: Movies collected at the scope were clustered into optics groups based on the XML meta-data of the data-collection software EPU (Thermo Fisher Scientific) using a k-means algorithm implemented ...詳細: Movies collected at the scope were clustered into optics groups based on the XML meta-data of the data-collection software EPU (Thermo Fisher Scientific) 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 implemented in RELION-3.1. Contrast transfer functions (CTFs) of the resulting motion-corrected micrographs were estimated using CTFFIND4. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
CTF補正 | 詳細: PseudoSubtomograms as described in Zivanov 2022 (https://elifesciences.org/articles/83724) タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 1971908 詳細: Initially, side views of S-layer sheets were first manually picked along the edge of the lattice using the helical picking tab in RELION while setting the helical rise to 60 angstrom. Top and ...詳細: Initially, side views of S-layer sheets were first manually picked along the edge of the lattice using the helical picking tab in RELION while setting the helical rise to 60 angstrom. Top and tilted views were manually picked at the central hexameric axis. Manually picked particles were extracted in 4x downsampled 128x128 pixel2 boxes and classified using reference-free 2D classification inside RELION-3.1. Class averages centered at a hexameric axis were used to automatically pick particles inside RELION-3.1. Automatically picked particles were extracted in 4x downsampled 128x128 pixel2 boxes and classified using reference-free 2D classification. Particle coordinates belonging to class averages centered at the hexameric axis were used to train TOPAZ in 5x downsampled micrographs with the neural network architecture conv127. For the final reconstruction, particles were picked using TOPAZ and the previously trained neural network above. Additionally, top, bottom, and side views were picked using the reference-based autopicker inside RELION-3.1, which TOPAZ did not readily identify. Particles were extracted in 4x downsampled 128x128 pixel2 boxes and classified using reference-free 2D classification inside RELION-3.1. Particles belonging to class averages centered at the hexameric axis were combined, and particles within 30 angstrom were removed to prevent duplication after alignment. All resulting particles were then re-extracted in 4x downsampled 128x128 pixel2 boxes. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.5 Å / 解像度の算出法: OTHER / 粒子像の数: 108621 / アルゴリズム: FOURIER SPACE / 詳細: Composite map between C2 and C6 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
EM volume selection | Num. of tomograms: 153 / Num. of volumes extracted: 138532 / Reference model: None | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: AB INITIO MODEL / 空間: RECIPROCAL / Target criteria: Best Fit | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
拘束条件 |
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