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データを開く
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基本情報
登録情報 | データベース: PDB / ID: 8s50 | |||||||||||||||||||||||||||||||||||||||
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タイトル | Cryo-EM structure of the C terminal region of PTX3 with a section of coiled-coil | |||||||||||||||||||||||||||||||||||||||
![]() | Pentraxin-related protein PTX3 | |||||||||||||||||||||||||||||||||||||||
![]() | IMMUNE SYSTEM / PTX3 / Pentraxin / pattern / recognition / coiled-coil / coil / innate / immunity / extracellular / octamer / Pentraxin-related / cryo-EM | |||||||||||||||||||||||||||||||||||||||
機能・相同性 | ![]() (1->3)-beta-D-glucan binding / negative regulation by host of viral glycoprotein metabolic process / negative regulation of glycoprotein metabolic process / ovarian cumulus expansion / negative regulation by host of viral process / opsonization / complement component C1q complex binding / response to yeast / host-mediated suppression of symbiont invasion / virion binding ...(1->3)-beta-D-glucan binding / negative regulation by host of viral glycoprotein metabolic process / negative regulation of glycoprotein metabolic process / ovarian cumulus expansion / negative regulation by host of viral process / opsonization / complement component C1q complex binding / response to yeast / host-mediated suppression of symbiont invasion / virion binding / positive regulation of phagocytosis / extracellular matrix organization / extracellular matrix / specific granule lumen / positive regulation of nitric oxide biosynthetic process / tertiary granule lumen / inflammatory response / innate immune response / Neutrophil degranulation / extracellular space / extracellular region / identical protein 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: 3.33 Å | |||||||||||||||||||||||||||||||||||||||
![]() | Snee, M. / Shah, A. / Lockhart-Cairns, M. / Collins, R. / Levy, C. / Baldock, C. / Day, A. | |||||||||||||||||||||||||||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: The structural organisation of pentraxin-3 and its interactions with heavy chains of inter-α-inhibitor regulate crosslinking of the hyaluronan matrix. 著者: Anokhi Shah / Xiaoli Zhang / Matthew Snee / Michael P Lockhart-Cairns / Colin W Levy / Thomas A Jowitt / Holly L Birchenough / Louisa Dean / Richard Collins / Rebecca J Dodd / Abigail R E ...著者: Anokhi Shah / Xiaoli Zhang / Matthew Snee / Michael P Lockhart-Cairns / Colin W Levy / Thomas A Jowitt / Holly L Birchenough / Louisa Dean / Richard Collins / Rebecca J Dodd / Abigail R E Roberts / Jan J Enghild / Alberto Mantovani / Juan Fontana / Clair Baldock / Antonio Inforzato / Ralf P Richter / Anthony J Day / ![]() ![]() ![]() 要旨: Pentraxin-3 (PTX3) is an octameric protein, comprised of eight identical protomers, that has diverse functions in reproductive biology, innate immunity and cancer. PTX3 interacts with the large ...Pentraxin-3 (PTX3) is an octameric protein, comprised of eight identical protomers, that has diverse functions in reproductive biology, innate immunity and cancer. PTX3 interacts with the large polysaccharide hyaluronan (HA) to which heavy chains (HCs) of the inter-α-inhibitor (IαI) family of proteoglycans are covalently attached, playing a key role in the (non-covalent) crosslinking of HC•HA complexes. These interactions stabilise the cumulus matrix, essential for ovulation and fertilisation in mammals, and are also implicated in the formation of pathogenic matrices in the context of viral lung infections. To better understand the physiological and pathological roles of PTX3 we have analysed how its quaternary structure underpins HA crosslinking via its interactions with HCs. A combination of X-ray crystallography, cryo-electron microscopy (cryo-EM) and AlphaFold predictive modelling revealed that the C-terminal pentraxin domains of the PTX3 octamer are arranged in a central cube, with two long extensions on either side, each formed from four protomers assembled into tetrameric coiled-coil regions, essentially as described by (Noone et al., 2022; doi:10.1073/pnas.2208144119). From crystallography and cryo-EM data, we identified a network of inter-protomer salt bridges that facilitate the assembly of the octamer. Small angle X-ray scattering (SAXS) validated our model for the octameric protein, including the analysis of two PTX3 constructs: a tetrameric 'Half-PTX3' and a construct missing the 24 N-terminal residues (Δ1-24_PTX3). SAXS determined a length of ∼520 Å for PTX3 and, combined with 3D variability analysis of cryo-EM data, defined the flexibility of the N-terminal extensions. Biophysical analyses revealed that the prototypical heavy chain HC1 does not interact with PTX3 at pH 7.4, consistent with our previous studies showing that, at this pH, PTX3 only associates with HC•HA complexes if they are formed in its presence. However, PTX3 binds to HC1 at acidic pH, and can also be incorporated into pre-formed HC•HA complexes under these conditions. This provides a novel mechanism for the regulation of PTX3-mediated HA crosslinking (e.g., during inflammation), likely mediated by a pH-dependent conformational change in HC1. The PTX3 octamer was found to associate simultaneously with up to eight HC1 molecules and, thus, has the potential to form a major crosslinking node within HC•HA matrices, i.e., where the physical and biochemical properties of resulting matrices could be tuned by the HC/PTX3 composition. #1: ![]() 年: 2018 タイトル: Real-space refinement in PHENIX for cryo-EM and crystallography 著者: Afonine, P. / Poon, B. / Read, R. / Sobolev, O. / Terwilliger, T. / Urzhumtsev, A. / Adams, P. | |||||||||||||||||||||||||||||||||||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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PDBx/mmCIF形式 | ![]() | 598.4 KB | 表示 | ![]() |
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その他 | ![]() |
-検証レポート
文書・要旨 | ![]() | 426.7 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 448.3 KB | 表示 | |
XML形式データ | ![]() | 39.5 KB | 表示 | |
CIF形式データ | ![]() | 55.9 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 | ![]() 19717MC 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: 40206.141 Da / 分子数: 8 / 由来タイプ: 組換発現 詳細: Full length pentraxin 3 is cleaved by the expressing cells during secretion 由来: (組換発現) ![]() 発現宿主: ![]() ![]() 参照: UniProt: P26022 #2: 糖 | ChemComp-NAG / #3: 水 | ChemComp-HOH / | 研究の焦点であるリガンドがあるか | N | Has protein modification | 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: 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: Pentraxin 3 / タイプ: COMPLEX 詳細: Pentraxin 3 is a pattern recognition protein which forms a homo-octameric complex Entity ID: #1 / 由来: RECOMBINANT |
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分子量 | 値: 0.321 MDa / 実験値: NO |
由来(天然) | 生物種: ![]() |
由来(組換発現) | 生物種: ![]() ![]() |
緩衝液 | pH: 7.4 / 詳細: PBS pH 7.4 |
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 |
試料支持 | グリッドの材料: GOLD / 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: 277.15 K |
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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 |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 165000 X / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 1000 nm / Cs: 2.7 mm |
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 平均露光時間: 4.4 sec. / 電子線照射量: 40 e/Å2 フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) |
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解析
EMソフトウェア |
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CTF補正 | タイプ: NONE | ||||||||||||||||||||||||||||
対称性 | 点対称性: D4 (2回x4回 2面回転対称) | ||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.33 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 23457 / 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 | プロトコル: FLEXIBLE FIT / 空間: REAL / Target criteria: RSC 詳細: Initial fitting was done using chimera followed by real-space refinement in phenix and rebuilding in COOT | ||||||||||||||||||||||||||||
原子モデル構築 | PDB-ID: 8PVQ Accession code: 8PVQ / Source name: PDB / タイプ: experimental model | ||||||||||||||||||||||||||||
拘束条件 |
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