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- EMDB-72393: Insulin Degrading Enzyme Time-resolved O/O state -

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Basic information

Entry
Database: EMDB / ID: EMD-72393
TitleInsulin Degrading Enzyme Time-resolved O/O state
Map data
Sample
  • Complex: Cysteine-free Insulin-degrading enzyme
    • Protein or peptide: Cysteine-free Insulin-degrading enzyme
KeywordsM16A zinc metalloprotease / HYDROLASE
Function / homology
Function and homology information


insulysin / beta-endorphin binding / ubiquitin recycling / insulin catabolic process / insulin metabolic process / amyloid-beta clearance by cellular catabolic process / hormone catabolic process / bradykinin catabolic process / cytosolic proteasome complex / positive regulation of protein binding ...insulysin / beta-endorphin binding / ubiquitin recycling / insulin catabolic process / insulin metabolic process / amyloid-beta clearance by cellular catabolic process / hormone catabolic process / bradykinin catabolic process / cytosolic proteasome complex / positive regulation of protein binding / insulin binding / regulation of aerobic respiration / peptide catabolic process / peroxisomal matrix / amyloid-beta clearance / amyloid-beta metabolic process / Insulin receptor recycling / negative regulation of proteolysis / peptide binding / : / protein catabolic process / Peroxisomal protein import / antigen processing and presentation of endogenous peptide antigen via MHC class I / metalloendopeptidase activity / positive regulation of protein catabolic process / insulin receptor signaling pathway / peroxisome / amyloid-beta binding / virus receptor activity / endopeptidase activity / basolateral plasma membrane / Ub-specific processing proteases / external side of plasma membrane / protein-containing complex binding / cell surface / protein homodimerization activity / ATP hydrolysis activity / mitochondrion / proteolysis / : / extracellular exosome / zinc ion binding / ATP binding / identical protein binding / nucleus / cytoplasm / cytosol
Similarity search - Function
Peptidase M16, middle/third domain / Middle or third domain of peptidase_M16 / : / PQQ synthase PqqF-like, C-terminal lobe domain 4 / : / Peptidase M16, zinc-binding site / Insulinase family, zinc-binding region signature. / Peptidase M16, C-terminal / Peptidase M16 inactive domain / Peptidase M16, N-terminal ...Peptidase M16, middle/third domain / Middle or third domain of peptidase_M16 / : / PQQ synthase PqqF-like, C-terminal lobe domain 4 / : / Peptidase M16, zinc-binding site / Insulinase family, zinc-binding region signature. / Peptidase M16, C-terminal / Peptidase M16 inactive domain / Peptidase M16, N-terminal / Insulinase (Peptidase family M16) / Metalloenzyme, LuxS/M16 peptidase-like
Similarity search - Domain/homology
Insulin-degrading enzyme
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 5.1 Å
AuthorsMancl JM / Tang WJ
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS) United States
Citation
Journal: Elife / Year: 2026
Title: Characterization and modulation of human insulin degrading enzyme conformational dynamics to control enzyme activity.
Authors: Jordan M Mancl / Wenguang G Liang / Nicholas L Bayhi / Hui Wei / William C Budell / Joshua H Mendez / Tobin R Sosnick / Bridget Carragher / Clinton S Potter / Wei-Jen Tang /
Abstract: Insulin degrading enzyme (IDE) is a dimeric M16A zinc metalloprotease that degrades amyloidogenic peptides diverse in shape and sequence, including insulin and amyloid-β, to prevent toxic amyloid ...Insulin degrading enzyme (IDE) is a dimeric M16A zinc metalloprotease that degrades amyloidogenic peptides diverse in shape and sequence, including insulin and amyloid-β, to prevent toxic amyloid fibril formation. IDE has a hollow catalytic chamber formed by two ~55 kDa N- and C- domains (IDE-N and IDE-C, respectively), in which peptides bind, unfold, and are repositioned for proteolysis. IDE is known to transition between a closed state, poised for catalysis, and an open state, able to release cleavage products and bind a new substrate. Here, we present six cryo-EM structures of the IDE dimer at 3.0-5.1 Å resolution, obtained in the presence of a sub-saturating concentration of insulin. Combining cryo-EM heterogeneity analysis with all-atom molecular dynamics (MD) simulations, we identified the structural basis and key residues for IDE conformational dynamics that were not previously revealed by IDE static structures. Notably, R668 serves as a molecular latch mediating the open-close transition and facilitates key protein motions through charge-swapping interactions at the IDE-N/C interface. Our small-angle X-ray scattering analysis and enzymatic assays of an R668A mutant indicate a profound alteration of conformational dynamics and catalytic activity. By integrating coarse-grained MD simulations, our analysis reveals that IDE unfolds its substrates through the coordinated motion between IDE-N and IDE-C, as well as β-sheet formation between IDE and insulin. Additionally, our time-resolved cryo-EM analysis uncovers IDE allostery within the IDE dimer. Collectively, our findings demonstrate the strength of combining experimental and computational approaches to probe protein dynamics and pave the way for developing substrate-specific modulators of IDE activity.
#1: Journal: eLife / Year: 2025
Title: Characterization and modulation of human insulin degrading enzyme conformational dynamics to control enzyme activity
Authors: Mancl JM / Liang WG / Wei H / Carragher B / Potter CS / Tang WJ
History
DepositionAug 28, 2025-
Header (metadata) releaseMay 6, 2026-
Map releaseMay 6, 2026-
UpdateJun 24, 2026-
Current statusJun 24, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_72393.png

Downloads & links

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Map

FileDownload / File: emd_72393.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 360 pix.
= 381.6 Å		1.06 Å/pix.
x 360 pix.
= 381.6 Å		1.06 Å/pix.
x 360 pix.
= 381.6 Å

Surface

Projections

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.06 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.002
Minimum - Maximum-0.017593272 - 0.03120911
Average (Standard dev.)0.00000868285 (±0.00040714897)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 381.59998 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_72393_half_map_1.map
Projections & Slices
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Histogram

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Half map: #1

Fileemd_72393_half_map_2.map
Projections & Slices
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Sample components

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Entire : Cysteine-free Insulin-degrading enzyme

EntireName: Cysteine-free Insulin-degrading enzyme
Components
  • Complex: Cysteine-free Insulin-degrading enzyme
    • Protein or peptide: Cysteine-free Insulin-degrading enzyme

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Supramolecule #1: Cysteine-free Insulin-degrading enzyme

SupramoleculeName: Cysteine-free Insulin-degrading enzyme / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Cysteine-free Insulin-degrading enzyme

MacromoleculeName: Cysteine-free Insulin-degrading enzyme / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO / EC number: insulysin
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 117.068508 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MRYRLAWLLH PALPSTFRSV LGARLPPPER LCGFQKKTYS KMNNPAIKRI GNHITKSPED KREYRGLELA NGIKVLLISD PTTDKSSAA LDVHIGSLSD PPNIAGLSHF LEHMLFLGTK KYPKENEYSQ FLSEHAGSSN AFTSGEHTNY YFDVSHEHLE G ALDRFAQF ...String:
MRYRLAWLLH PALPSTFRSV LGARLPPPER LCGFQKKTYS KMNNPAIKRI GNHITKSPED KREYRGLELA NGIKVLLISD PTTDKSSAA LDVHIGSLSD PPNIAGLSHF LEHMLFLGTK KYPKENEYSQ FLSEHAGSSN AFTSGEHTNY YFDVSHEHLE G ALDRFAQF FLSPLFDESA KDREVNAVDS EHEKNVMNDA WRLFQLEKAT GNPKHPFSKF GTGNKYTLET RPNQEGIDVR QE LLKFHSA YYSSNLMAVV VLGRESLDDL TNLVVKLFSE VENKNVPLPE FPEHPFQEEH LKQLYKIVPI KDIRNLYVTF PIP DLQKYY KSNPGHYLGH LIGHEGPGSL LSELKSKGWV NTLVGGQKEG ARGFMFFIIN VDLTEEGLLH VEDIILHMFQ YIQK LRAEG PQEWVFQELK DLNAVAFRFK DKERPRGYTS KIAGILHYYP LEEVLTAEYL LEEFRPDLIE MVLDKLRPEN VRVAI VSKS FEGKTDRTEE WYGTQYKQEA IPDEVIKKWQ NADLNGKFKL PTKNEFIPTN FEILPLEKEA TPYPALIKDT AMSKLW FKQ DDKFFLPKAN LNFEFFSPFA YVDPLHSNMA YLYLELLKDS LNEYAYAAEL AGLSYDLQNT IYGMYLSVKG YNDKQPI LL KKIIEKMATF EIDEKRFEII KEAYMRSLNN FRAEQPHQHA MYYLRLLMTE VAWTKDELKE ALDDVTLPRL KAFIPQLL S RLHIEALLHG NITKQAALGI MQMVEDTLIE HAHTKPLLPS QLVRYREVQL PDRGWFVYQQ RNEVHNNSGI EIYYQTDMQ STSENMFLEL FAQIISEPAF NTLRTKEQLG YIVFSGPRRA NGIQGLRFII QSEKPPHYLE SRVEAFLITM EKSIEDMTEE AFQKHIQAL AIRRLDKPKK LSAESAKYWG EIISQQYNFD RDNTEVAYLK TLTKEDIIKF YKEMLAVDAP RRHKVSVHVL A REMDSSPV VGEFPSQNDI NLSQAPALPQ PEVIQNMTEF KRGLPLFPLV KPH

UniProtKB: Insulin-degrading enzyme

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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

BufferpH: 7.5
VitrificationCryogen name: ETHANE / Instrument: SPOTITON

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsEnergy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 65.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.7000000000000001 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 5.1 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 5.0.0) / Number images used: 376750
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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