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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: 8sku | ||||||
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タイトル | Structure of human SIgA1 in complex with human CD89 (FcaR1) | ||||||
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![]() | IMMUNE SYSTEM / Secretory immunoglobulin A / SIgA / IgA / CD89 / FcaR1 / IgA Fc receptor / protein complex | ||||||
機能・相同性 | ![]() IgA receptor activity / polymeric immunoglobulin receptor activity / immunoglobulin transcytosis in epithelial cells mediated by polymeric immunoglobulin receptor / polymeric immunoglobulin binding / dimeric IgA immunoglobulin complex / secretory dimeric IgA immunoglobulin complex / pentameric IgM immunoglobulin complex / monomeric IgA immunoglobulin complex / cellular response to interferon-alpha / Fc receptor signaling pathway ...IgA receptor activity / polymeric immunoglobulin receptor activity / immunoglobulin transcytosis in epithelial cells mediated by polymeric immunoglobulin receptor / polymeric immunoglobulin binding / dimeric IgA immunoglobulin complex / secretory dimeric IgA immunoglobulin complex / pentameric IgM immunoglobulin complex / monomeric IgA immunoglobulin complex / cellular response to interferon-alpha / Fc receptor signaling pathway / secretory IgA immunoglobulin complex / immune response-regulating signaling pathway / IgA binding / positive regulation of neutrophil apoptotic process / IgA immunoglobulin complex / glomerular filtration / detection of chemical stimulus involved in sensory perception of bitter taste / neutrophil activation / cellular response to granulocyte macrophage colony-stimulating factor stimulus / cellular response to interleukin-6 / neutrophil mediated immunity / IgG immunoglobulin complex / immunoglobulin receptor binding / azurophil granule membrane / immunoglobulin complex, circulating / receptor clustering / positive regulation of respiratory burst / humoral immune response / tertiary granule membrane / ficolin-1-rich granule membrane / complement activation, classical pathway / Scavenging of heme from plasma / specific granule membrane / antigen binding / Cell surface interactions at the vascular wall / B cell receptor signaling pathway / cellular response to type II interferon / epidermal growth factor receptor signaling pathway / cellular response to tumor necrosis factor / transmembrane signaling receptor activity / antibacterial humoral response / cellular response to lipopolysaccharide / protein-containing complex assembly / blood microparticle / protein-macromolecule adaptor activity / adaptive immune response / receptor complex / immune response / innate immune response / Neutrophil degranulation / signal transduction / protein homodimerization activity / extracellular space / extracellular exosome / extracellular region / plasma membrane 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: 3.2 Å | ||||||
![]() | Liu, Q. / Stadtmueller, B.M. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: SIgA structures bound to Streptococcus pyogenes M4 and human CD89 provide insights into host-pathogen interactions. 著者: Qianqiao Liu / Beth M Stadtmueller / ![]() 要旨: Immunoglobulin (Ig) A functions as monomeric IgA in the serum and Secretory (S) IgA in mucosal secretions. Host IgA Fc receptors (FcαRs), including human FcαR1/CD89, mediate IgA effector functions; ...Immunoglobulin (Ig) A functions as monomeric IgA in the serum and Secretory (S) IgA in mucosal secretions. Host IgA Fc receptors (FcαRs), including human FcαR1/CD89, mediate IgA effector functions; however, human pathogen Streptococcus pyogenes has evolved surface-protein virulence factors, including M4, that also engage the CD89-binding site on IgA. Despite human mucosa serving as a reservoir for pathogens, SIgA interactions with CD89 and M4 remain poorly understood. Here we report cryo-EM structures of M4-SIgA and CD89-SIgA complexes, which unexpectedly reveal different SIgA-binding stoichiometry for M4 and CD89. Structural data, supporting experiments, and modeling indicate that copies of SIgA bound to S. pyogenes M4 will adopt similar orientations on the bacterium surface and leave one host FcαR binding site open. Results suggest unappreciated functional consequences associated with SIgA binding to host and bacterial FcαRs relevant to understanding host-microbe co-evolution, IgA effector functions and improving the outcomes of group A Streptococcus infection. | ||||||
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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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ダウンロード
PDBx/mmCIF形式 | ![]() | 680.2 KB | 表示 | ![]() |
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PDB形式 | ![]() | 表示 | ![]() | |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
文書・要旨 | ![]() | 1.5 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.5 MB | 表示 | |
XML形式データ | ![]() | 64.9 KB | 表示 | |
CIF形式データ | ![]() | 95.5 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 | ![]() 40567MC ![]() 8skvC 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
-Immunoglobulin ... , 3種, 7分子 ABCDRSJ
#1: タンパク質 | 分子量: 37687.488 Da / 分子数: 4 / 由来タイプ: 組換発現 詳細: The sequence of the Fab region is not included due to legal reasons. 由来: (組換発現) ![]() ![]() #3: タンパク質 | 分子量: 23615.742 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() #4: タンパク質 | | 分子量: 15611.458 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
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-タンパク質 , 1種, 1分子 E
#2: タンパク質 | 分子量: 61095.578 Da / 分子数: 1 / 由来タイプ: 組換発現 / 詳細: secretory component / 由来: (組換発現) ![]() ![]() |
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-糖 , 2種, 8分子 
#5: 多糖 | 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose #6: 糖 | ChemComp-NAG / |
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-詳細
研究の焦点であるリガンドがあるか | N |
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Has protein modification | 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 |
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試料調製
構成要素 | 名称: human SIgA1 in complex with human CD89 (FcaR1) / タイプ: COMPLEX / Entity ID: #1-#4 / 由来: RECOMBINANT |
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由来(天然) | 生物種: ![]() |
由来(組換発現) | 生物種: ![]() |
緩衝液 | pH: 7 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % |
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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 / 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 |
撮影 | 電子線照射量: 71.3 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
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解析
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
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3次元再構成 | 解像度: 3.2 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 249000 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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