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- PDB-6b7y: Cryo-EM structure of human insulin degrading enzyme -

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Basic information

Database: PDB / ID: 6b7y
TitleCryo-EM structure of human insulin degrading enzyme
ComponentsInsulin-degrading enzyme
KeywordsHYDROLASE / IDE / insulin degrading enzyme / amyloid beta / BIOSYNTHETIC PROTEIN
Function / homologyPeptidase M16, N-terminal / Peptidase M16, zinc-binding site / Peroxisomal protein import / Ub-specific processing proteases / Insulinase family, zinc-binding region signature. / Middle or third domain of peptidase_M16 / Peptidase M16 inactive domain / Insulinase (Peptidase family M16) / Peptidase M16, middle/third domain / Metalloenzyme, LuxS/M16 peptidase-like ...Peptidase M16, N-terminal / Peptidase M16, zinc-binding site / Peroxisomal protein import / Ub-specific processing proteases / Insulinase family, zinc-binding region signature. / Middle or third domain of peptidase_M16 / Peptidase M16 inactive domain / Insulinase (Peptidase family M16) / Peptidase M16, middle/third domain / Metalloenzyme, LuxS/M16 peptidase-like / Peptidase M16, C-terminal / beta-endorphin binding / insulysin / bradykinin catabolic process / insulin catabolic process / insulin metabolic process / ubiquitin recycling / ubiquitin-dependent protein binding / hormone catabolic process / insulin binding / cytosolic proteasome complex / amyloid-beta clearance / determination of adult lifespan / peroxisomal matrix / positive regulation of protein oligomerization / amyloid-beta metabolic process / proteolysis involved in cellular protein catabolic process / protein targeting to peroxisome / positive regulation of protein catabolic process / negative regulation of proteolysis / protein heterooligomerization / peptide binding / peroxisome / metalloendopeptidase activity / insulin receptor signaling pathway / virus receptor activity / amyloid-beta binding / protein homotetramerization / protein homooligomerization / ATPase activity / proteolysis / signaling receptor binding / cell surface / mitochondrion / protein homodimerization activity / zinc ion binding / extracellular space / ATP binding / identical protein binding / plasma membrane / nucleus / cytosol / cytoplasm / Insulin-degrading enzyme
Function and homology information
Specimen sourceHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / 6.5 Å resolution
AuthorsLiang, W.G. / Zhang, Z. / Bailey, L.J. / Kossiakoff, A.A. / Tan, Y.Z. / Wei, H. / Carragher, B. / Potter, S.C. / Tang, W.J.
CitationJournal: Elife / Year: 2018
Title: Ensemble cryoEM elucidates the mechanism of insulin capture and degradation by human insulin degrading enzyme.
Authors: Zhening Zhang / Wenguang G Liang / Lucas J Bailey / Yong Zi Tan / Hui Wei / Andrew Wang / Mara Farcasanu / Virgil A Woods / Lauren A McCord / David Lee / Weifeng Shang / Rebecca Deprez-Poulain / Benoit Deprez / David R Liu / Akiko Koide / Shohei Koide / Anthony A Kossiakoff / Sheng Li / Bridget Carragher / Clinton S Potter / Wei-Jen Tang
Abstract: Insulin degrading enzyme (IDE) plays key roles in degrading peptides vital in type two diabetes, Alzheimer's, inflammation, and other human diseases. However, the process through which IDE recognizes ...Insulin degrading enzyme (IDE) plays key roles in degrading peptides vital in type two diabetes, Alzheimer's, inflammation, and other human diseases. However, the process through which IDE recognizes peptides that tend to form amyloid fibrils remained unsolved. We used cryoEM to understand both the apo- and insulin-bound dimeric IDE states, revealing that IDE displays a large opening between the homologous ~55 kDa N- and C-terminal halves to allow selective substrate capture based on size and charge complementarity. We also used cryoEM, X-ray crystallography, SAXS, and HDX-MS to elucidate the molecular basis of how amyloidogenic peptides stabilize the disordered IDE catalytic cleft, thereby inducing selective degradation by substrate-assisted catalysis. Furthermore, our insulin-bound IDE structures explain how IDE processively degrades insulin by stochastically cutting either chain without breaking disulfide bonds. Together, our studies provide a mechanism for how IDE selectively degrades amyloidogenic peptides and offers structural insights for developing IDE-based therapies.
Validation Report
SummaryFull reportAbout validation report
DateDeposition: Oct 5, 2017 / Release: Nov 8, 2017
RevisionDateData content typeGroupCategoryItemProviderType
1.0Nov 8, 2017Structure modelrepositoryInitial release
1.1Dec 6, 2017Structure modelAuthor supporting evidencepdbx_audit_support_pdbx_audit_support.funding_organization
1.2Apr 11, 2018Structure modelData collection / Database referencescitation / citation_author_citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.name

Structure visualization

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Deposited unit
A: Insulin-degrading enzyme
B: Insulin-degrading enzyme

Theoretical massNumber of molelcules
Total (without water)223,7332

TypeNameSymmetry operationNumber
identity operation1_5551
Buried area (Å2)2570
ΔGint (kcal/M)-3
Surface area (Å2)86270


#1: Protein/peptide Insulin-degrading enzyme / / Abeta-degrading protease / Insulin protease / Insulinase / Insulysin

Mass: 111866.484 Da / Num. of mol.: 2 / Fragment: residues 46-1011 / Source: (gene. exp.) Homo sapiens (human) / Gene: IDE / Production host: Escherichia coli (E. coli) / References: UniProt: P14735, insulysin

Experimental details


EM experimentAggregation state: PARTICLE / Reconstruction method: single particle reconstruction

Sample preparation

ComponentName: Insulin degrading enzymeInsulin-degrading enzyme / Type: COMPLEX
Details: Cryo-EM structure of human Apo insulin degrading enzyme
Entity ID: 1 / Source: RECOMBINANT
Molecular weightValue: 0.1 MDa / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli) / Strain: BL
Buffer solutionpH: 7.8
Buffer component
IDConc.NameFormulaBuffer ID
120 mmol/LHEPESC8H18N2O4S1
2300 mmol/LSodium chlorideNaCl1
320 mmol/LEDTAC10H16N2O81
SpecimenConc.: 0.3 mg/ml / Details: The sample was monodisperse / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: The grids are homemade lacey gold nanowire grids / Grid material: GOLD / Grid mesh size: 300 / Grid type: Homemade
VitrificationInstrument: HOMEMADE PLUNGER / Cryogen name: ETHANE / Humidity: 85 % / Chamber temperature: 298 kelvins / Details: The cryo grids were made using Spotiton

Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyMicroscope model: FEI TITAN KRIOS / Details: The image was collected at 20-50 degree tilt
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal magnification: 22500 / Calibrated magnification: 46598 / Nominal defocus max: 2200 nm / Nominal defocus min: 940 nm / Cs: 2.7 mm / C2 aperture diameter: 70 mm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (max): 70 kelvins / Temperature (min): 70 kelvins / Residual tilt: 10 mradians
Image recording

Imaging ID: 1 / Average exposure time: 10 sec. / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Number of grids imaged: 1

IDElectron doseNumber of real images
Image scansSampling size: 5 microns / Width: 3710 / Height: 3838 / Movie frames/image: 50 / Used frames/image: 1-50


SoftwareName: PHENIX / Version: 1.12_2829: / Classification: refinement
EM software
1DoG Pickerparticle selection
2Leginon3.3image acquisition
4GctfGctf-v0.50_sm_30_cu7.5_x86_64CTF correction
7CootCoot 0.8.9_premodel fitting
8UCSF ChimeraChimera 1.11.2model fitting
10RELION2.0initial Euler assignment
11RELION2.0final Euler assignment
13RELION2.13D reconstruction
14PHENIXPhenix-1.12-2829model refinement
Particle selectionNumber of particles selected: 762283
SymmetryPoint symmetry: C1
3D reconstructionResolution: 6.5 Å / Resolution method: FSC 0.143 CUT-OFF / Number of particles: 24425 / Algorithm: FOURIER SPACE / Number of class averages: 1 / Symmetry type: POINT
Atomic model buildingOverall b value: 92 / Ref protocol: FLEXIBLE FIT / Ref space: REAL
Refine LS restraints
Refine IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00715804
ELECTRON MICROSCOPYf_angle_d1.18021375
ELECTRON MICROSCOPYf_dihedral_angle_d8.2019561
ELECTRON MICROSCOPYf_chiral_restr0.0642302
ELECTRON MICROSCOPYf_plane_restr0.0092762

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