+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 7pkh | ||||||
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タイトル | C-reactive protein decamer at pH 5 with phosphocholine ligand | ||||||
要素 | C-reactive protein | ||||||
キーワード | IMMUNE SYSTEM / C-reactive protein / CRP / innate immunity | ||||||
機能・相同性 | 機能・相同性情報 regulation of interleukin-8 production / opsonization / complement component C1q complex binding / low-density lipoprotein particle binding / negative regulation of mononuclear cell proliferation / vasoconstriction / choline binding / low-density lipoprotein particle receptor binding / Classical antibody-mediated complement activation / negative regulation of macrophage derived foam cell differentiation ...regulation of interleukin-8 production / opsonization / complement component C1q complex binding / low-density lipoprotein particle binding / negative regulation of mononuclear cell proliferation / vasoconstriction / choline binding / low-density lipoprotein particle receptor binding / Classical antibody-mediated complement activation / negative regulation of macrophage derived foam cell differentiation / negative regulation of lipid storage / positive regulation of superoxide anion generation / acute-phase response / defense response to Gram-positive bacterium / inflammatory response / innate immune response / calcium ion binding / positive regulation of gene expression / extracellular space / extracellular region / identical protein binding 類似検索 - 分子機能 | ||||||
生物種 | Homo sapiens (ヒト) | ||||||
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 Å | ||||||
データ登録者 | Noone, D.P. / Sharp, T.H. | ||||||
資金援助 | European Union, 1件
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引用 | ジャーナル: Front Immunol / 年: 2021 タイトル: Cryo-Electron Microscopy and Biochemical Analysis Offer Insights Into the Effects of Acidic pH, Such as Occur During Acidosis, on the Complement Binding Properties of C-Reactive Protein. 著者: Dylan P Noone / Tijn T van der Velden / Thomas H Sharp / 要旨: The pentraxin family of proteins includes C-reactive protein (CRP), a canonical marker for the acute phase inflammatory response. As compared to normal physiological conditions in human serum, under ...The pentraxin family of proteins includes C-reactive protein (CRP), a canonical marker for the acute phase inflammatory response. As compared to normal physiological conditions in human serum, under conditions associated with damage and inflammation, such as acidosis and the oxidative burst, CRP exhibits modulated biochemical properties that may have a structural basis. Here, we explore how pH and ligand binding affect the structure and biochemical properties of CRP. Cryo-electron microscopy was used to solve structures of CRP at pH 7.5 or pH 5 and in the presence or absence of the ligand phosphocholine (PCh), which yielded 7 new high-resolution structures of CRP, including pentameric and decameric complexes. Structures previously derived from crystallography were imperfect pentagons, as shown by the variable angles between each subunit, whereas pentameric CRP derived from cryoEM was found to have C5 symmetry, with subunits forming a regular pentagon with equal angles. This discrepancy indicates flexibility at the interfaces of monomers that may relate to activation of the complement system by the C1 complex. CRP also appears to readily decamerise in solution into dimers of pentamers, which obscures the postulated binding sites for C1. Subtle structural rearrangements were observed between the conditions tested, including a putative change in histidine protonation that may prime the disulphide bridges for reduction and enhanced ability to activate the immune system. Enzyme-linked immunosorbent assays showed that CRP had markedly increased association to the C1 complex and immunoglobulins under conditions associated with acidosis, whilst a reduction in the Ca concentration lowered this pH-sensitivity for C1q, but not immunoglobulins, suggesting different modes of binding. These data suggest a model whereby a change in the ionic nature of CRP and immunological proteins can make it more adhesive to potential ligands without large structural rearrangements. | ||||||
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 | 7pkh.cif.gz | 666 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb7pkh.ent.gz | 562.4 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 7pkh.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 | 7pkh_validation.pdf.gz | 1.5 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 7pkh_full_validation.pdf.gz | 1.6 MB | 表示 | |
XML形式データ | 7pkh_validation.xml.gz | 71.8 KB | 表示 | |
CIF形式データ | 7pkh_validation.cif.gz | 104.7 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/pk/7pkh ftp://data.pdbj.org/pub/pdb/validation_reports/pk/7pkh | 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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-要素
#1: タンパク質 | 分子量: 23068.039 Da / 分子数: 10 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: CRP, PTX1 / 発現宿主: Escherichia coli (大腸菌) / 参照: UniProt: P02741 #2: 化合物 | ChemComp-CA / #3: 化合物 | ChemComp-PC / #4: 水 | ChemComp-HOH / | 研究の焦点であるリガンドがあるか | Y | 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 |
-試料調製
構成要素 | 名称: C-reactive protein decamer with phosphocholine ligand タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT | ||||||||||||||||||||||||||||||
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分子量 | 値: 0.230 MDa / 実験値: NO | ||||||||||||||||||||||||||||||
由来(天然) | 生物種: Homo sapiens (ヒト) | ||||||||||||||||||||||||||||||
由来(組換発現) | 生物種: Escherichia coli (大腸菌) | ||||||||||||||||||||||||||||||
緩衝液 | pH: 5 | ||||||||||||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 6 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: COPPER / 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: LEICA EM GP / 凍結剤: ETHANE / 湿度: 65 % / 凍結前の試料温度: 277.15 K |
-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 / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 800 nm / Cs: 2.7 mm / C2レンズ絞り径: 50 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 |
撮影 | 平均露光時間: 2.25 sec. / 電子線照射量: 50 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 撮影したグリッド数: 1 / 実像数: 9520 |
電子光学装置 | エネルギーフィルター名称: GIF Bioquantum / 詳細: Gatan BioQuantum K3 / エネルギーフィルタースリット幅: 20 eV |
-解析
ソフトウェア | 名称: PHENIX / バージョン: 1.18.2_3874: / 分類: 精密化 | ||||||||||||||||||||||||||||||||||||||||||||||||||
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EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 1805017 | ||||||||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C1 (非対称) | ||||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3 Å / 解像度の算出法: FSC 0.33 CUT-OFF / 粒子像の数: 323169 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT | ||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | PDB-ID: 1B09 Accession code: 1B09 / Source name: PDB / タイプ: experimental model | ||||||||||||||||||||||||||||||||||||||||||||||||||
拘束条件 |
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