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基本情報
登録情報 | データベース: PDB / ID: 6lxw | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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タイトル | Cryo-EM structure of human secretory immunoglobulin A in complex with the N-terminal domain of SpsA | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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![]() | IMMUNE SYSTEM / immunoglobulin / dimer / transcytosis / secreted | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
機能・相同性 | ![]() polymeric immunoglobulin receptor activity / immunoglobulin transcytosis in epithelial cells mediated by polymeric immunoglobulin receptor / kappa-type opioid receptor binding / response to tacrolimus / polymeric immunoglobulin binding / regulation of T cell homeostatic proliferation / regulation of CD4-positive, alpha-beta T cell proliferation / dimeric IgA immunoglobulin complex / interleukin-2 receptor binding / secretory dimeric IgA immunoglobulin complex ...polymeric immunoglobulin receptor activity / immunoglobulin transcytosis in epithelial cells mediated by polymeric immunoglobulin receptor / kappa-type opioid receptor binding / response to tacrolimus / polymeric immunoglobulin binding / regulation of T cell homeostatic proliferation / regulation of CD4-positive, alpha-beta T cell proliferation / dimeric IgA immunoglobulin complex / interleukin-2 receptor binding / secretory dimeric IgA immunoglobulin complex / pentameric IgM immunoglobulin complex / monomeric IgA immunoglobulin complex / Fc receptor signaling pathway / secretory IgA immunoglobulin complex / negative regulation of lymphocyte proliferation / glycosphingolipid binding / positive regulation of plasma cell differentiation / negative regulation of T-helper 17 cell differentiation / positive regulation of tissue remodeling / IgA binding / IgA immunoglobulin complex / RUNX1 and FOXP3 control the development of regulatory T lymphocytes (Tregs) / glomerular filtration / leukocyte activation involved in immune response / positive regulation of isotype switching to IgG isotypes / detection of chemical stimulus involved in sensory perception of bitter taste / interleukin-2-mediated signaling pathway / activated T cell proliferation / IgG immunoglobulin complex / cell surface receptor signaling pathway via STAT / kinase activator activity / natural killer cell activation / Interleukin-2 signaling / positive regulation of regulatory T cell differentiation / immunoglobulin receptor binding / azurophil granule membrane / immunoglobulin complex, circulating / negative regulation of B cell apoptotic process / positive regulation of immunoglobulin production / receptor clustering / positive regulation of dendritic spine development / positive regulation of interleukin-17 production / positive regulation of respiratory burst / positive regulation of activated T cell proliferation / humoral immune response / T cell differentiation / complement activation, classical pathway / Interleukin receptor SHC signaling / Scavenging of heme from plasma / antigen binding / extrinsic apoptotic signaling pathway in absence of ligand / positive regulation of B cell proliferation / cytokine activity / Cell surface interactions at the vascular wall / B cell receptor signaling pathway / growth factor activity / negative regulation of inflammatory response / positive regulation of type II interferon production / epidermal growth factor receptor signaling pathway / positive regulation of inflammatory response / transmembrane signaling receptor activity / antibacterial humoral response / cell-cell signaling / positive regulation of cytosolic calcium ion concentration / RAF/MAP kinase cascade / carbohydrate binding / positive regulation of cell growth / protein-containing complex assembly / blood microparticle / response to ethanol / protein-macromolecule adaptor activity / phospholipase C-activating G protein-coupled receptor signaling pathway / adaptive immune response / transcription by RNA polymerase II / receptor complex / cell adhesion / immune response / innate immune response / positive regulation of cell population proliferation / Neutrophil degranulation / negative regulation of apoptotic process / signal transduction / protein homodimerization activity / positive regulation of transcription by RNA polymerase II / 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: 3.27 Å | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | Wang, Y. / Wang, G. / Li, Y. / Xiao, J. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural insights into secretory immunoglobulin A and its interaction with a pneumococcal adhesin. 著者: Yuxin Wang / Guopeng Wang / Yaxin Li / Qinyu Zhu / Hao Shen / Ning Gao / Junyu Xiao / ![]() 要旨: Secretory Immunoglobulin A (SIgA) is the most abundant antibody at the mucosal surface. It possesses two additional subunits besides IgA: the joining chain (J-chain) and secretory component (SC). SC ...Secretory Immunoglobulin A (SIgA) is the most abundant antibody at the mucosal surface. It possesses two additional subunits besides IgA: the joining chain (J-chain) and secretory component (SC). SC is the ectodomain of the polymeric immunoglobulin receptor (pIgR), which functions to transport IgA to the mucosa. How the J-chain and pIgR/SC facilitate the assembly and secretion of SIgA remains incompletely understood. Furthermore, during the infection of Streptococcus pneumoniae, the pneumococcal adhesin SpsA hijacks pIgR/SC and SIgA to gain entry to human cells and evade host defense. How SpsA targets pIgR/SC and SIgA also remains elusive. Here we report a cryo-electron microscopy structure of the Fc region of IgA1 (Fcα) in complex with the J-chain and SC (Fcα-J-SC), which reveals the organization principle of SIgA. We also present a structure of Fcα-J-SC complexed with SpsA, which uncovers the specific interactions between SpsA and human pIgR/SC. These results advance the molecular understanding of SIgA and shed light on S. pneumoniae pathogenesis. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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構造の表示
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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 | ![]() | 294.1 KB | 表示 | ![]() |
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PDB形式 | ![]() | 228.6 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
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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 | ![]() | 56.2 KB | 表示 | |
CIF形式データ | ![]() | 88.1 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
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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: 抗体 | 分子量: 31445.693 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() #2: タンパク質 | | 分子量: 19225.762 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() #3: タンパク質 | | 分子量: 63306.336 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() #4: タンパク質 | | 分子量: 36311.113 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 遺伝子: spsA / 発現宿主: ![]() 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: Quadruple complex of human secretory immunoglobulin A with the N-terminal domain of SpsA タイプ: COMPLEX / Entity ID: all / 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: 7.4 |
試料 | 濃度: 0.2 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 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 |
撮影 | 電子線照射量: 59.74 e/Å2 / 検出モード: SUPER-RESOLUTION フィルム・検出器のモデル: GATAN K2 QUANTUM (4k x 4k) |
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解析
ソフトウェア | 名称: PHENIX / バージョン: 1.15.2_3472: / 分類: 精密化 | ||||||||||||||||||||||||
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EMソフトウェア | 名称: PHENIX / カテゴリ: モデル精密化 | ||||||||||||||||||||||||
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
対称性 | 点対称性: C1 (非対称) | ||||||||||||||||||||||||
3次元再構成 | 解像度: 3.27 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 280791 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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