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- PDB-7wso: Structure of a membrane protein G -

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Basic information

Entry
Database: PDB / ID: 7wso
TitleStructure of a membrane protein G
Components
  • B-cell antigen receptor complex-associated protein alpha chain
  • B-cell antigen receptor complex-associated protein beta chain
  • Immunoglobulin heavy constant gamma 1
KeywordsIMMUNE SYSTEM / membrane
Function / homology
Function and homology information


IgM B cell receptor complex / B cell receptor complex / CD22 mediated BCR regulation / B cell activation / B cell proliferation / multivesicular body / B cell differentiation / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / B cell receptor signaling pathway / transmembrane signaling receptor activity ...IgM B cell receptor complex / B cell receptor complex / CD22 mediated BCR regulation / B cell activation / B cell proliferation / multivesicular body / B cell differentiation / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / B cell receptor signaling pathway / transmembrane signaling receptor activity / Potential therapeutics for SARS / adaptive immune response / membrane => GO:0016020 / immune response / membrane raft / external side of plasma membrane / signal transduction / extracellular exosome / identical protein binding / plasma membrane
Similarity search - Function
B-cell antigen receptor complex-associated protein alpha/beta chain / Immunoreceptor tyrosine-based activation motif / Phosphorylated immunoreceptor signalling ITAM / ITAM motif mammalian type profile. / Immunoreceptor tyrosine-based activation motif / Immunoglobulin / Immunoglobulin domain / Immunoglobulin subtype 2 / Immunoglobulin C-2 Type / Immunoglobulin V-set domain ...B-cell antigen receptor complex-associated protein alpha/beta chain / Immunoreceptor tyrosine-based activation motif / Phosphorylated immunoreceptor signalling ITAM / ITAM motif mammalian type profile. / Immunoreceptor tyrosine-based activation motif / Immunoglobulin / Immunoglobulin domain / Immunoglobulin subtype 2 / Immunoglobulin C-2 Type / Immunoglobulin V-set domain / Immunoglobulin V-set domain / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulin subtype / Immunoglobulins and major histocompatibility complex proteins signature. / Immunoglobulin / Immunoglobulin C-Type / Immunoglobulin C1-set / Immunoglobulin C1-set domain / Ig-like domain profile. / Immunoglobulin-like domain / Immunoglobulin-like domain superfamily / Immunoglobulin-like fold
Similarity search - Domain/homology
Immunoglobulin heavy constant gamma 1 / B-cell antigen receptor complex-associated protein alpha chain / B-cell antigen receptor complex-associated protein beta chain
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.03 Å
AuthorsMa, X. / Zhu, Y. / Chen, Y. / Huang, Z.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Science / Year: 2022
Title: Cryo-EM structures of two human B cell receptor isotypes.
Authors: Xinyu Ma / Yuwei Zhu / De Dong / Yan Chen / Shubo Wang / Dehui Yang / Zhuo Ma / Anqi Zhang / Fan Zhang / Changyou Guo / Zhiwei Huang /
Abstract: The B cell receptor (BCR) complex plays a critical role in B cell development and immune responses. The assembly mechanisms underlying the BCR complex remain unknown. We determined the cryo-electron ...The B cell receptor (BCR) complex plays a critical role in B cell development and immune responses. The assembly mechanisms underlying the BCR complex remain unknown. We determined the cryo-electron microscopy (cryo-EM) structures of human IgG-BCR and IgM-BCR, which consist of membrane-bound immunoglobulin molecules (mIg) and Igα/β subunits at a 1:1 stoichiometry. Assembly of both BCR complexes involves their extracellular domains, membrane-proximal connection peptides, and transmembrane (TM) helices. The TM helices of mIgG and mIgM share a conserved set of hydrophobic and polar interactions with Igα/β TM helices. By contrast, the IgG-Cγ3 and IgM-Cμ4 domains interact with extracellular Ig-like domains of Igα/β through head-to-tail and side-by-side modes, respectively. This work reveals the structural basis for BCR assembly and provides insights into BCR triggering.
History
DepositionJan 30, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Aug 31, 2022Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
K: Immunoglobulin heavy constant gamma 1
A: B-cell antigen receptor complex-associated protein alpha chain
B: Immunoglobulin heavy constant gamma 1
C: B-cell antigen receptor complex-associated protein beta chain


Theoretical massNumber of molelcules
Total (without water)88,7154
Polymers88,7154
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Immunoglobulin heavy constant gamma 1


Mass: 28533.205 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: IGHG1 / Production host: Homo sapiens (human) / References: UniProt: A0A0A0MS08
#2: Protein B-cell antigen receptor complex-associated protein alpha chain / Ig-alpha / MB-1 membrane glycoprotein / Membrane-bound immunoglobulin-associated protein / Surface ...Ig-alpha / MB-1 membrane glycoprotein / Membrane-bound immunoglobulin-associated protein / Surface IgM-associated protein


Mass: 15504.718 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CD79A, IGA, MB1 / Production host: Homo sapiens (human) / References: UniProt: P11912
#3: Protein B-cell antigen receptor complex-associated protein beta chain / B-cell-specific glycoprotein B29 / Ig-beta / Immunoglobulin-associated B29 protein


Mass: 16143.744 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CD79B, B29, IGB / Production host: Homo sapiens (human) / References: UniProt: P40259

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: complex / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: NITROGEN

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2500 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 1.5 e/Å2 / Film or detector model: GATAN K2 QUANTUM (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.03 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 213086 / Symmetry type: POINT

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