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基本情報
登録情報 | データベース: PDB / ID: 8yvu | |||||||||||||||||||||||||||||||||
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タイトル | structure of Ige receptor | |||||||||||||||||||||||||||||||||
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![]() | MEMBRANE PROTEIN / immunology / Ige receptor / allergy | |||||||||||||||||||||||||||||||||
機能・相同性 | ![]() IgE receptor activity / Fc-epsilon receptor I complex / Fc receptor mediated stimulatory signaling pathway / T cell differentiation involved in immune response / high-affinity IgE receptor activity / negative regulation of mast cell apoptotic process / type I hypersensitivity / mast cell apoptotic process / Fc-gamma receptor III complex / eosinophil degranulation ...IgE receptor activity / Fc-epsilon receptor I complex / Fc receptor mediated stimulatory signaling pathway / T cell differentiation involved in immune response / high-affinity IgE receptor activity / negative regulation of mast cell apoptotic process / type I hypersensitivity / mast cell apoptotic process / Fc-gamma receptor III complex / eosinophil degranulation / serotonin secretion by platelet / positive regulation of mast cell cytokine production / neutrophil activation involved in immune response / positive regulation of mast cell degranulation / Fc-gamma receptor signaling pathway / positive regulation of type III hypersensitivity / regulation of platelet activation / Platelet Adhesion to exposed collagen / positive regulation of type IIa hypersensitivity / IgE binding / positive regulation of protein localization to cell surface / positive regulation of type I hypersensitivity / interleukin-3-mediated signaling pathway / Fc epsilon receptor (FCERI) signaling / type 2 immune response / IgG binding / phagocytosis, engulfment / mast cell degranulation / Dectin-2 family / positive regulation of interleukin-4 production / antigen processing and presentation of exogenous peptide antigen via MHC class I / Fc-epsilon receptor signaling pathway / immunoglobulin mediated immune response / tertiary granule membrane / positive regulation of interleukin-10 production / cellular response to low-density lipoprotein particle stimulus / ficolin-1-rich granule membrane / Role of LAT2/NTAL/LAB on calcium mobilization / GPVI-mediated activation cascade / neutrophil chemotaxis / FCERI mediated Ca+2 mobilization / positive regulation of phagocytosis / osteoclast differentiation / integrin-mediated signaling pathway / protein localization to plasma membrane / Cell surface interactions at the vascular wall / FCERI mediated MAPK activation / FCERI mediated NF-kB activation / antigen processing and presentation of exogenous peptide antigen via MHC class II / receptor internalization / positive regulation of interleukin-6 production / positive regulation of tumor necrosis factor production / cell surface receptor signaling pathway / defense response to bacterium / immune response / innate immune response / external side of plasma membrane / Neutrophil degranulation / cell surface / protein homodimerization activity / identical protein binding / plasma membrane 類似検索 - 分子機能 | |||||||||||||||||||||||||||||||||
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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: 3.9 Å | |||||||||||||||||||||||||||||||||
![]() | Chen, M.Y. / Su, Q. / Shi, Y.G. | |||||||||||||||||||||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Molecular mechanism of IgE-mediated FcεRI activation. 著者: Mengying Chen / Qiang Su / Yigong Shi / ![]() 要旨: Allergic diseases affect more than a quarter of individuals in industrialized countries, and are a major public health concern. The high-affinity Fc receptor for immunoglobulin E (FcεRI), which is ...Allergic diseases affect more than a quarter of individuals in industrialized countries, and are a major public health concern. The high-affinity Fc receptor for immunoglobulin E (FcεRI), which is mainly present on mast cells and basophils, has a crucial role in allergic diseases. Monomeric immunoglobulin E (IgE) binding to FcεRI regulates mast cell survival, differentiation and maturation. However, the underlying molecular mechanism remains unclear. Here we demonstrate that prior to IgE binding, FcεRI exists mostly as a homodimer on human mast cell membranes. The structure of human FcεRI confirms the dimeric organization, with each promoter comprising one α subunit, one β subunit and two γ subunits. The transmembrane helices of the α subunits form a layered arrangement with those of the γ and β subunits. The dimeric interface is mediated by a four-helix bundle of the α and γ subunits at the intracellular juxtamembrane region. Cholesterol-like molecules embedded within the transmembrane domain may stabilize the dimeric assembly. Upon IgE binding, the dimeric FcεRI dissociates into two protomers, each of which binds to an IgE molecule. This process elicits transcriptional activation of Egr1, Egr3 and Ccl2 in rat basophils, which can be attenuated by inhibiting the FcεRI dimer-to-monomer transition. Collectively, our study reveals the mechanism of antigen-independent, IgE-mediated FcεRI activation. | |||||||||||||||||||||||||||||||||
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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 | ![]() | 103.4 KB | 表示 | ![]() |
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PDB形式 | ![]() | 78.8 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 | ![]() | 523.7 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 532.7 KB | 表示 | |
XML形式データ | ![]() | 12.9 KB | 表示 | |
CIF形式データ | ![]() | 19.4 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 | ![]() 39614MC ![]() 8ywaC 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・ペプチド | 分子量: 4375.302 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() #2: タンパク質 | 分子量: 17309.385 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() #3: タンパク質・ペプチド | 分子量: 4552.554 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() #4: 化合物 | 研究の焦点であるリガンドがあるか | Y | Has protein modification | N | |
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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: Structure of ige receptor / タイプ: COMPLEX / Entity ID: #1-#3 / 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: 7.5 |
試料 | 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 |
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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): -1200 nm |
撮影 | 電子線照射量: 50 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOCONTINUUM (6k x 4k) |
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解析
EMソフトウェア | 名称: PHENIX / カテゴリ: モデル精密化 | ||||||||||||||||||||||||
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CTF補正 | タイプ: NONE | ||||||||||||||||||||||||
3次元再構成 | 解像度: 3.9 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 170032 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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