- PDB-7jic: Structure of human CD19-CD81 co-receptor complex bound to coltuxi... -
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基本情報
登録情報
データベース: PDB / ID: 7jic
タイトル
Structure of human CD19-CD81 co-receptor complex bound to coltuximab Fab fragment
要素
B-lymphocyte antigen CD19
CD81 antigen
Coltuximab Heavy Chain
Coltuximab Light Chain
キーワード
IMMUNE SYSTEM / tetraspanin / Fab / complex
機能・相同性
機能・相同性情報
regulation of B cell activation / positive regulation of adaptive immune memory response / positive regulation of protein catabolic process in the vacuole / antigen receptor-mediated signaling pathway / CD4-positive, alpha-beta T cell costimulation / osteoclast fusion / B-1 B cell differentiation / positive regulation of B cell receptor signaling pathway / myoblast fusion involved in skeletal muscle regeneration / positive regulation of inflammatory response to antigenic stimulus ...regulation of B cell activation / positive regulation of adaptive immune memory response / positive regulation of protein catabolic process in the vacuole / antigen receptor-mediated signaling pathway / CD4-positive, alpha-beta T cell costimulation / osteoclast fusion / B-1 B cell differentiation / positive regulation of B cell receptor signaling pathway / myoblast fusion involved in skeletal muscle regeneration / positive regulation of inflammatory response to antigenic stimulus / regulation of B cell receptor signaling pathway / positive regulation of T cell activation via T cell receptor contact with antigen bound to MHC molecule on antigen presenting cell / regulation of macrophage migration / macrophage fusion / immunological synapse formation / transferrin receptor binding / positive regulation of T-helper 2 cell cytokine production / protein localization to lysosome / tetraspanin-enriched microdomain / B cell proliferation involved in immune response / positive regulation of protein exit from endoplasmic reticulum / MHC class II protein binding / humoral immune response mediated by circulating immunoglobulin / positive regulation of CD4-positive, alpha-beta T cell proliferation / cholesterol binding / positive regulation of T cell receptor signaling pathway / cellular response to low-density lipoprotein particle stimulus / immunological synapse / immunoglobulin mediated immune response / positive regulation of B cell proliferation / positive regulation of receptor clustering / basal plasma membrane / positive regulation of release of sequestered calcium ion into cytosol / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / Regulation of Complement cascade / protein localization to plasma membrane / B cell receptor signaling pathway / regulation of protein stability / receptor internalization / Constitutive Signaling by Aberrant PI3K in Cancer / Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell / integrin binding / PIP3 activates AKT signaling / MHC class II protein complex binding / virus receptor activity / PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling / basolateral plasma membrane / vesicle / positive regulation of MAPK cascade / positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction / membrane raft / external side of plasma membrane / focal adhesion / positive regulation of transcription by RNA polymerase II / protein-containing complex / extracellular exosome / membrane / plasma membrane 類似検索 - 分子機能
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)
HL 147459
米国
National Institutes of Health/National Cancer Institute (NIH/NCI)
R35 CA220340
米国
National Institutes of Health/Office of the Director
DP5 OD021345
米国
引用
ジャーナル: Science / 年: 2021 タイトル: Cryo-EM structure of the B cell co-receptor CD19 bound to the tetraspanin CD81. 著者: Katherine J Susa / Shaun Rawson / Andrew C Kruse / Stephen C Blacklow / 要旨: Signaling through the CD19-CD81 co-receptor complex, in combination with the B cell receptor, is a critical determinant of B cell development and activation. It is unknown how CD81 engages CD19 to ...Signaling through the CD19-CD81 co-receptor complex, in combination with the B cell receptor, is a critical determinant of B cell development and activation. It is unknown how CD81 engages CD19 to enable co-receptor function. Here, we report a 3.8-angstrom structure of the CD19-CD81 complex bound to a therapeutic antigen-binding fragment, determined by cryo-electron microscopy (cryo-EM). The structure includes both the extracellular domains and the transmembrane helices of the complex, revealing a contact interface between the ectodomains that drives complex formation. Upon binding to CD19, CD81 opens its ectodomain to expose a hydrophobic CD19-binding surface and reorganizes its transmembrane helices to occlude a cholesterol binding pocket present in the apoprotein. Our data reveal the structural basis for CD19-CD81 complex assembly, providing a foundation for rational design of therapies for B cell dysfunction.