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- PDB-8em7: Cryo-EM structure of LRP2 at pH 5.2 -

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Basic information

Entry
Database: PDB / ID: 8em7
TitleCryo-EM structure of LRP2 at pH 5.2
ComponentsLow-density lipoprotein receptor-related protein 2
KeywordsMEMBRANE PROTEIN / LRP2 / Megalin / GP330 / Endocytosis
Function / homology
Function and homology information


Transport of RCbl within the body / vitamin metabolic process / endocytic hemoglobin import into cell / Retinoid metabolism and transport / chemoattraction of axon / positive regulation of oligodendrocyte progenitor proliferation / pulmonary artery morphogenesis / secondary heart field specification / alcohol metabolic process / folate import across plasma membrane ...Transport of RCbl within the body / vitamin metabolic process / endocytic hemoglobin import into cell / Retinoid metabolism and transport / chemoattraction of axon / positive regulation of oligodendrocyte progenitor proliferation / pulmonary artery morphogenesis / secondary heart field specification / alcohol metabolic process / folate import across plasma membrane / ventricular compact myocardium morphogenesis / response to leptin / protein transporter activity / Cargo recognition for clathrin-mediated endocytosis / metal ion transport / Clathrin-mediated endocytosis / transcytosis / vitamin D metabolic process / cranial skeletal system development / neuron projection arborization / coronary artery morphogenesis / insulin-like growth factor I binding / protein import / outflow tract septum morphogenesis / coronary vasculature development / cargo receptor activity / positive regulation of neurogenesis / endosomal transport / ventricular septum development / aorta development / low-density lipoprotein particle receptor binding / hemoglobin binding / positive regulation of lipoprotein transport / forebrain development / vagina development / amyloid-beta clearance / outflow tract morphogenesis / hormone binding / brush border / positive regulation of endocytosis / endocytic vesicle / negative regulation of BMP signaling pathway / response to X-ray / axonal growth cone / clathrin-coated pit / receptor-mediated endocytosis / endosome lumen / nuclear receptor binding / PDZ domain binding / phosphatidylinositol 3-kinase/protein kinase B signal transduction / neural tube closure / kidney development / brush border membrane / sensory perception of sound / SH3 domain binding / cellular response to growth factor stimulus / male gonad development / endocytosis / apical part of cell / protein transport / protein-folding chaperone binding / heart development / gene expression / cell population proliferation / receptor complex / apical plasma membrane / endosome / axon / external side of plasma membrane / calcium ion binding / dendrite / negative regulation of apoptotic process / protein-containing complex binding / cell surface / endoplasmic reticulum / Golgi apparatus / protein-containing complex / extracellular space / membrane / plasma membrane
Similarity search - Function
: / LRP2-like, EGF-like domain / Complement Clr-like EGF domain / Complement Clr-like EGF-like / : / Low-density lipoprotein receptor repeat class B / LDL-receptor class B (LDLRB) repeat profile. / LDLR class B repeat / Low-density lipoprotein-receptor YWTD domain / Low-density lipoprotein receptor domain class A ...: / LRP2-like, EGF-like domain / Complement Clr-like EGF domain / Complement Clr-like EGF-like / : / Low-density lipoprotein receptor repeat class B / LDL-receptor class B (LDLRB) repeat profile. / LDLR class B repeat / Low-density lipoprotein-receptor YWTD domain / Low-density lipoprotein receptor domain class A / : / Calcium-binding EGF domain / Low-density lipoprotein (LDL) receptor class A, conserved site / LDL-receptor class A (LDLRA) domain signature. / LDL-receptor class A (LDLRA) domain profile. / Low-density lipoprotein receptor domain class A / Low-density lipoprotein (LDL) receptor class A repeat / LDL receptor-like superfamily / Six-bladed beta-propeller, TolB-like / Coagulation Factor Xa inhibitory site / EGF-type aspartate/asparagine hydroxylation site / EGF-like calcium-binding, conserved site / Calcium-binding EGF-like domain signature. / Aspartic acid and asparagine hydroxylation site. / EGF-like calcium-binding domain / Calcium-binding EGF-like domain / Epidermal growth factor-like domain. / EGF-like domain profile. / Growth factor receptor cysteine-rich domain superfamily / EGF-like domain signature 1. / EGF-like domain signature 2. / EGF-like domain
Similarity search - Domain/homology
2-acetamido-2-deoxy-beta-D-galactopyranose / Low-density lipoprotein receptor-related protein 2
Similarity search - Component
Biological speciesMus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.97 Å
AuthorsBeenken, A. / Cerutti, G. / Fitzpatrick, A.W. / Barasch, J. / Shapiro, L.
Funding support United States, 1items
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 27, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 8, 2023Provider: repository / Type: Initial release
Revision 1.1Feb 22, 2023Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Mar 8, 2023Group: Database references / Category: citation / Item: _citation.journal_volume / _citation.page_first
Revision 1.3Nov 13, 2024Group: Data collection / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Low-density lipoprotein receptor-related protein 2
B: Low-density lipoprotein receptor-related protein 2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)1,070,856214
Polymers1,039,4932
Non-polymers31,363212
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Low-density lipoprotein receptor-related protein 2 / LRP-2 / Glycoprotein 330 / gp330 / Megalin


Mass: 519746.500 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Mus musculus (house mouse) / References: UniProt: A2ARV4
#2: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 2 / Source method: isolated from a natural source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}}LINUCSPDB-CARE
#3: Sugar...
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 78 / Source method: obtained synthetically / Formula: C8H15NO6 / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
#4: Sugar...
ChemComp-NGA / 2-acetamido-2-deoxy-beta-D-galactopyranose / N-acetyl-beta-D-galactosamine / 2-acetamido-2-deoxy-beta-D-galactose / 2-acetamido-2-deoxy-D-galactose / 2-acetamido-2-deoxy-galactose / N-ACETYL-D-GALACTOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 44 / Source method: obtained synthetically / Formula: C8H15NO6 / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
DGalpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-galactopyranosamineCOMMON NAMEGMML 1.0
b-D-GalpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GalNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
#5: Chemical...
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 88 / Source method: obtained synthetically / Formula: Ca / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationY

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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: LRP2 at endosomal pH / Type: COMPLEX / Details: Endogenously purified from mouse kidney / Entity ID: #1 / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Mus musculus (house mouse)
Buffer solutionpH: 5.2
SpecimenConc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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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: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1500 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 58.06 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

Software
NameVersionClassificationNB
phenix.real_space_refine1.17.1_3660refinement
PHENIX1.17.1_3660refinement
EM software
IDNameCategory
2Leginonimage acquisition
4cryoSPARCCTF correction
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 2.97 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 209932 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 57.14 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.006669090
ELECTRON MICROSCOPYf_angle_d1.273894172
ELECTRON MICROSCOPYf_chiral_restr0.0710476
ELECTRON MICROSCOPYf_plane_restr0.012412438
ELECTRON MICROSCOPYf_dihedral_angle_d12.522524358

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