- EMDB-22344: Structure of human CD19-CD81 co-receptor complex bound to coltuxi... -
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Basic information
Entry
Database: EMDB / ID: EMD-22344
Title
Structure of human CD19-CD81 co-receptor complex bound to coltuximab Fab fragment
Map data
Sample
Complex: Complex of B cell co-receptor CD19 bound to the tetraspanin CD81 and coltuximab Fab fragment
Complex: B cell co-receptor CD19 bound to the tetraspanin CD81
Protein or peptide: B-lymphocyte antigen CD19
Protein or peptide: CD81 antigen
Complex: coltuximab Fab fragment
Protein or peptide: Coltuximab Heavy Chain
Protein or peptide: Coltuximab Light Chain
Function / homology
Function and homology information
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 / transferrin receptor binding / immunological synapse formation / 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 Similarity search - Function
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)
HL 147459
United States
National Institutes of Health/Office of the Director
DP5 OD021345
United States
National Institutes of Health/National Cancer Institute (NIH/NCI)
R35 CA220340
United States
Citation
Journal: Science / Year: 2021 Title: Cryo-EM structure of the B cell co-receptor CD19 bound to the tetraspanin CD81. Authors: Katherine J Susa / Shaun Rawson / Andrew C Kruse / Stephen C Blacklow / Abstract: 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.
History
Deposition
Jul 23, 2020
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Header (metadata) release
Jan 20, 2021
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Map release
Jan 20, 2021
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Update
Jan 20, 2021
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Current status
Jan 20, 2021
Processing site: RCSB / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Entire : Complex of B cell co-receptor CD19 bound to the tetraspanin CD81 ...
Entire
Name: Complex of B cell co-receptor CD19 bound to the tetraspanin CD81 and coltuximab Fab fragment
Components
Complex: Complex of B cell co-receptor CD19 bound to the tetraspanin CD81 and coltuximab Fab fragment
Complex: B cell co-receptor CD19 bound to the tetraspanin CD81
Protein or peptide: B-lymphocyte antigen CD19
Protein or peptide: CD81 antigen
Complex: coltuximab Fab fragment
Protein or peptide: Coltuximab Heavy Chain
Protein or peptide: Coltuximab Light Chain
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Supramolecule #1: Complex of B cell co-receptor CD19 bound to the tetraspanin CD81 ...
Supramolecule
Name: Complex of B cell co-receptor CD19 bound to the tetraspanin CD81 and coltuximab Fab fragment type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Molecular weight
Theoretical: 110 KDa
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Supramolecule #2: B cell co-receptor CD19 bound to the tetraspanin CD81
Supramolecule
Name: B cell co-receptor CD19 bound to the tetraspanin CD81 / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1-#2
Source (natural)
Organism: Homo sapiens (human)
Recombinant expression
Organism: Homo sapiens (human) / Recombinant cell: Expi293F
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Supramolecule #3: coltuximab Fab fragment
Supramolecule
Name: coltuximab Fab fragment / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #3-#4
Source (natural)
Organism: Mus musculus (house mouse)
Recombinant expression
Organism: Homo sapiens (human) / Recombinant cell: Expi293F
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Macromolecule #1: B-lymphocyte antigen CD19
Macromolecule
Name: B-lymphocyte antigen CD19 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 295 K / Instrument: FEI VITROBOT MARK IV Details: Blot for 4.5-5.5 seconds with a blot force of 15-16..
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Electron microscopy
Microscope
FEI TITAN KRIOS
Image recording
Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 6 / Average electron dose: 55.0 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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