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- EMDB-28030: BCRP_delta_Fab -

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Open data


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Basic information

Entry
Database: EMDB / ID: EMD-28030
TitleBCRP_delta_Fab
Map data
Sample
  • Complex: BCR complex
Biological speciesMus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.0 Å
AuthorsDong Y / Pi X / Wu H / Reth M
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nature / Year: 2022
Title: Structural principles of B cell antigen receptor assembly.
Authors: Ying Dong / Xiong Pi / Frauke Bartels-Burgahn / Deniz Saltukoglu / Zhuoyi Liang / Jianying Yang / Frederick W Alt / Michael Reth / Hao Wu /
Abstract: The B cell antigen receptor (BCR) is composed of a membrane-bound class M, D, G, E or A immunoglobulin for antigen recognition and a disulfide-linked Igα (also known as CD79A) and Igβ (also known ...The B cell antigen receptor (BCR) is composed of a membrane-bound class M, D, G, E or A immunoglobulin for antigen recognition and a disulfide-linked Igα (also known as CD79A) and Igβ (also known as CD79B) heterodimer (Igα/β) that functions as the signalling entity through intracellular immunoreceptor tyrosine-based activation motifs (ITAMs). The organizing principle of the BCR remains unknown. Here we report cryo-electron microscopy structures of mouse full-length IgM BCR and its Fab-deleted form. At the ectodomain (ECD), the Igα/β heterodimer mainly uses Igα to associate with Cµ3 and Cµ4 domains of one heavy chain (µHC) while leaving the other heavy chain (µHC') unbound. The transmembrane domain (TMD) helices of µHC and µHC' interact with those of the Igα/β heterodimer to form a tight four-helix bundle. The asymmetry at the TMD prevents the recruitment of two Igα/β heterodimers. Notably, the connecting peptide between the ECD and TMD of µHC intervenes in between those of Igα and Igβ to guide TMD assembly through charge complementarity. Weaker but distinct density for the Igβ ITAM nestles next to the TMD, suggesting potential autoinhibition of ITAM phosphorylation. Interfacial analyses suggest that all BCR classes utilize a general organizational architecture. Our studies provide a structural platform for understanding B cell signalling and designing rational therapies against BCR-mediated diseases.
History
DepositionSep 3, 2022-
Header (metadata) releaseNov 23, 2022-
Map releaseNov 23, 2022-
UpdateDec 21, 2022-
Current statusDec 21, 2022Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_28030.png

Downloads & links

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Map

FileDownload / File: emd_28030.map.gz / Format: CCP4 / Size: 137.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 330 pix.
= 273.9 Å		0.83 Å/pix.
x 330 pix.
= 273.9 Å		0.83 Å/pix.
x 330 pix.
= 273.9 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.83 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.3
Minimum - Maximum-1.51109 - 2.5449224
Average (Standard dev.)0.0011102676 (±0.03296093)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions330330330
Spacing330330330
CellA=B=C: 273.9 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: half map A

Fileemd_28030_half_map_1.map
Annotationhalf map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half map B

Fileemd_28030_half_map_2.map
Annotationhalf map B
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : BCR complex

EntireName: BCR complex
Components
  • Complex: BCR complex

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Supramolecule #1: BCR complex

SupramoleculeName: BCR complex / type: complex / ID: 1 / Chimera: Yes / Parent: 0 / Macromolecule list: #1-#3
Source (natural)Organism: Mus musculus (house mouse)

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.9 mg/mL
BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 1.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 359236
Final reconstructionAlgorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 4.0 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 359236
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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