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Structure paper

TitleEnsemble cryoEM elucidates the mechanism of insulin capture and degradation by human insulin degrading enzyme.
Journal, issue, pagesElife, Vol. 7, Year 2018
Publish dateMar 29, 2018
AuthorsZhening 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 /
PubMed AbstractInsulin 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.
External linksElife / PubMed:29596046 / PubMed Central
MethodsEM (single particle) / X-ray diffraction
Resolution3.7 - 7.2 Å
Structure data

EMDB-7041, PDB-6b3q, PDB-6bfc:
Cryo-EM structure of human insulin degrading enzyme in complex with insulin
Method: EM (single particle) / Resolution: 3.7 Å

EMDB-7062, PDB-6b70:
Cryo-EM structure of human insulin degrading enzyme in complex with FAB H11-E heavy chain, FAB H11-E light chain and insulin
Method: EM (single particle) / Resolution: 3.7 Å

EMDB-7065: Cryo-EM structure of human insulin degrading enzyme in complex with insulin
PDB-6b7y: Cryo-EM structure of human insulin degrading enzyme
Method: EM (single particle) / Resolution: 6.5 Å

EMDB-7066: Cryo-EM structure of human insulin degrading enzyme in complex with insulin
PDB-6b7z: Cryo-EM structure of human insulin degrading enzyme in complex with FAB H11 heavy chain and FAB H11 light chain
Method: EM (single particle) / Resolution: 6.5 Å

EMDB-7090, PDB-6bf6:
Cryo-EM structure of human insulin degrading enzyme
Method: EM (single particle) / Resolution: 6.5 Å

EMDB-7091, PDB-6bf7:
Cryo-EM structure of human insulin degrading enzyme in complex with FAB H11-E heavy chain, FAB H11-E light chain
Method: EM (single particle) / Resolution: 6.5 Å

EMDB-7092, PDB-6bf8:
Cryo-EM structure of human insulin degrading enzyme in complex with insulin
Method: EM (single particle) / Resolution: 4.2 Å

EMDB-7093, PDB-6bf9:
Cryo-EM structure of human insulin degrading enzyme in complex with FAB H11-E heavy chain, FAB H11-E light chain
Method: EM (single particle) / Resolution: 7.2 Å

PDB-5wob:
Crystal Structure Analysis of Fab1-Bound Human Insulin Degrading Enzyme (IDE) in Complex with Insulin
Method: X-RAY DIFFRACTION / Resolution: 3.95 Å

Chemicals

ChemComp-ZN:
Unknown entry

Source
  • homo sapiens (human)
  • mus musculoides (Temminck's mouse)
  • mus musculus (house mouse)
KeywordsHYDROLASE / complex / HYDROLASE/HORMONE / IDE / insulin degrading enzyme / amyloid beta / HYDROLASE-HORMONE complex / HYDROLASE/IMMUNE SYSTEM/HORMONE / BIOSYNTHETIC PROTEIN / HYDROLASE-IMMUNE SYSTEM-HORMONE complex / HYDROLASE/IMMUNE SYSTEM / HYDROLASE-IMMUNE SYSTEM complex / HORMONE

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