2WK3

Crystal structure of human insulin-degrading enzyme in complex with amyloid-beta (1-42)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.59 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Molecular Basis for the Recognition and Cleavages of Igf-II, Tgf-Alpha, and Amylin by Human Insulin Degrading Enzyme.

Guo, Q.Manolopoulou, M.Bian, Y.Schilling, A.B.Tang, W.J.

(2010) J Mol Biol 395: 430

  • DOI: https://doi.org/10.1016/j.jmb.2009.10.072
  • Primary Citation of Related Structures:  
    2WK3, 3E4Z, 3E50, 3HGZ

  • PubMed Abstract: 

    Insulin-degrading enzyme (IDE) is involved in the clearance of many bioactive peptide substrates, including insulin and amyloid-beta, peptides vital to the development of diabetes and Alzheimer's disease, respectively. IDE can also rapidly degrade hormones that are held together by intramolecular disulfide bond(s) without their reduction. Furthermore, IDE exhibits a remarkable ability to preferentially degrade structurally similar peptides such as the selective degradation of insulin-like growth factor (IGF)-II and transforming growth factor-alpha (TGF-alpha) over IGF-I and epidermal growth factor, respectively. Here, we used high-accuracy mass spectrometry to identify the cleavage sites of human IGF-II, TGF-alpha, amylin, reduced amylin, and amyloid-beta by human IDE. We also determined the structures of human IDE-IGF-II and IDE-TGF-alpha at 2.3 A and IDE-amylin at 2.9 A. We found that IDE cleaves its substrates at multiple sites in a biased stochastic manner. Furthermore, the presence of a disulfide bond in amylin allows IDE to cut at an additional site in the middle of the peptide (amino acids 18-19). Our amylin-bound IDE structure offers insight into how the structural constraint from a disulfide bond in amylin can alter IDE cleavage sites. Together with NMR structures of amylin and the IGF and epidermal growth factor families, our work also reveals the structural basis of how the high dipole moment of substrates complements the charge distribution of the IDE catalytic chamber for the substrate selectivity. In addition, we show how the ability of substrates to properly anchor their N-terminus to the exosite of IDE and undergo a conformational switch upon binding to the catalytic chamber of IDE can also contribute to the selective degradation of structurally related growth factors.


  • Organizational Affiliation

    Ben-May Department for Cancer Research, The University of Chicago, Chicago, IL 60637, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
INSULIN DEGRADING ENZYME
A, B
1,019Homo sapiensMutation(s): 14 
EC: 3.4.24.56
UniProt & NIH Common Fund Data Resources
Find proteins for P14735 (Homo sapiens)
Explore P14735 
Go to UniProtKB:  P14735
PHAROS:  P14735
GTEx:  ENSG00000119912 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP14735
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
BETA-AMYLOID PROTEIN 42
C, D
42Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P05067 (Homo sapiens)
Explore P05067 
Go to UniProtKB:  P05067
PHAROS:  P05067
GTEx:  ENSG00000142192 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05067
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.59 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 261.628α = 90
b = 261.628β = 90
c = 90.675γ = 120
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-11-03
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance