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- EMDB-28250: Local refinement of the P7 domain of LRP2 at pH 7.5 -

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Basic information

Entry
Database: EMDB / ID: EMD-28250
TitleLocal refinement of the P7 domain of LRP2 at pH 7.5
Map data
Sample
  • Complex: LRP2 at neutral pH
Biological speciesMus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsBeenken A / Shapiro L
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)DK124667 United States
CitationJournal: Cell / Year: 2023
Title: Structures of LRP2 reveal a molecular machine for endocytosis.
Authors: Andrew Beenken / Gabriele Cerutti / Julia Brasch / Yicheng Guo / Zizhang Sheng / Hediye Erdjument-Bromage / Zainab Aziz / Shelief Y Robbins-Juarez / Estefania Y Chavez / Goran Ahlsen / ...Authors: Andrew Beenken / Gabriele Cerutti / Julia Brasch / Yicheng Guo / Zizhang Sheng / Hediye Erdjument-Bromage / Zainab Aziz / Shelief Y Robbins-Juarez / Estefania Y Chavez / Goran Ahlsen / Phinikoula S Katsamba / Thomas A Neubert / Anthony W P Fitzpatrick / Jonathan Barasch / Lawrence Shapiro /
Abstract: The low-density lipoprotein (LDL) receptor-related protein 2 (LRP2 or megalin) is representative of the phylogenetically conserved subfamily of giant LDL receptor-related proteins, which function in ...The low-density lipoprotein (LDL) receptor-related protein 2 (LRP2 or megalin) is representative of the phylogenetically conserved subfamily of giant LDL receptor-related proteins, which function in endocytosis and are implicated in diseases of the kidney and brain. Here, we report high-resolution cryoelectron microscopy structures of LRP2 isolated from mouse kidney, at extracellular and endosomal pH. The structures reveal LRP2 to be a molecular machine that adopts a conformation for ligand binding at the cell surface and for ligand shedding in the endosome. LRP2 forms a homodimer, the conformational transformation of which is governed by pH-sensitive sites at both homodimer and intra-protomer interfaces. A subset of LRP2 deleterious missense variants in humans appears to impair homodimer assembly. These observations lay the foundation for further understanding the function and mechanism of LDL receptors and implicate homodimerization as a conserved feature of the LRP receptor subfamily.
History
DepositionSep 28, 2022-
Header (metadata) releaseFeb 8, 2023-
Map releaseFeb 8, 2023-
UpdateMar 8, 2023-
Current statusMar 8, 2023Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_28250.png

Downloads & links

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Map

FileDownload / File: emd_28250.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.08 Å
Density
Contour LevelBy AUTHOR: 0.6
Minimum - Maximum-0.8115702 - 2.7054143
Average (Standard dev.)0.0012148741 (±0.04633194)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 552.96 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: #1

Fileemd_28250_additional_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_28250_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_28250_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : LRP2 at neutral pH

EntireName: LRP2 at neutral pH
Components
  • Complex: LRP2 at neutral pH

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Supramolecule #1: LRP2 at neutral pH

SupramoleculeName: LRP2 at neutral pH / type: complex / ID: 1 / Chimera: Yes / Parent: 0 / Macromolecule list: #1 / Details: Endogenously purified from mouse kidney
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

Concentration2 mg/mL
BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.5 µm
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 54.87 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

1n7d

Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 165372
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementProtocol: FLEXIBLE FIT

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