4PFC

Crystal structure of insulin degrading enzyme complexed with inhibitor

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.21 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.202 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Dual Exosite-binding Inhibitors of Insulin-degrading Enzyme Challenge Its Role as the Primary Mediator of Insulin Clearance in Vivo.

Durham, T.B., Toth, J.L., Klimkowski, V.J., Cao, J.X., Siesky, A.M., Alexander-Chacko, J., Wu, G.Y., Dixon, J.T., McGee, J.E., Wang, Y., Guo, S.Y., Cavitt, R.N., Schindler, J., Thibodeaux, S.J., Calvert, N.A., Coghlan, M.J., Sindelar, D.K., Christe, M., Kiselyov, V.V., Michael, M.D., Sloop, K.W.

(2015) J Biol Chem 290: 20044-20059

  • DOI: 10.1074/jbc.M115.638205
  • Primary Citation of Related Structures:  
    4PFC, 4PF7, 4PF9

  • PubMed Abstract: 

    • Insulin-degrading enzyme (IDE, insulysin) is the best characterized catabolic enzyme implicated in proteolysis of insulin. Recently, a peptide inhibitor of IDE has been shown to affect levels of insulin, amylin, and glucagon in vivo. However, IDE(-/-) mice display variable phenotypes relating to fasting plasma insulin levels, glucose tolerance, and insulin sensitivity depending on the cohort and age of animals ...

    Insulin-degrading enzyme (IDE, insulysin) is the best characterized catabolic enzyme implicated in proteolysis of insulin. Recently, a peptide inhibitor of IDE has been shown to affect levels of insulin, amylin, and glucagon in vivo. However, IDE(-/-) mice display variable phenotypes relating to fasting plasma insulin levels, glucose tolerance, and insulin sensitivity depending on the cohort and age of animals. Here, we interrogated the importance of IDE-mediated catabolism on insulin clearance in vivo. Using a structure-based design, we linked two newly identified ligands binding at unique IDE exosites together to construct a potent series of novel inhibitors. These compounds do not interact with the catalytic zinc of the protease. Because one of these inhibitors (NTE-1) was determined to have pharmacokinetic properties sufficient to sustain plasma levels >50 times its IDE IC50 value, studies in rodents were conducted. In oral glucose tolerance tests with diet-induced obese mice, NTE-1 treatment improved the glucose excursion. Yet in insulin tolerance tests and euglycemic clamp experiments, NTE-1 did not enhance insulin action or increase plasma insulin levels. Importantly, IDE inhibition with NTE-1 did result in elevated plasma amylin levels, suggesting the in vivo role of IDE action on amylin may be more significant than an effect on insulin. Furthermore, using the inhibitors described in this report, we demonstrate that in HEK cells IDE has little impact on insulin clearance. In total, evidence from our studies supports a minimal role for IDE in insulin metabolism in vivo and suggests IDE may be more important in helping regulate amylin clearance.

    Organizational Affiliation: 

    Endocrine Discovery.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Insulin-degrading enzyme A, B989Homo sapiensMutation(s): 14 
Gene Names: IDE
EC: 3.4.24.56
Find proteins for P14735 (Homo sapiens)
Explore P14735 
Go to UniProtKB:  P14735
NIH Common Fund Data Resources
PHAROS:  P14735
GTEx:  ENSG00000119912
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
2QX
Query on 2QX
Download Ideal Coordinates CCD File 
A, B
methyl [(2S)-2-(5-{5-[4-({(2S)-2-[(3S)-3-amino-2-oxopiperidin-1-yl]-2-cyclohexylacetyl}amino)phenyl]pentyl}-2-fluorophenyl)-3-(quinolin-3-yl)propyl]carbamate
C44 H54 F N5 O4
SDVPSGCYRLUZSS-WXSHXSFMSA-N		 Ligand Interaction
ZN
Query on ZN
Download Ideal Coordinates CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
2QXIC50:  4   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.21 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.202 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.944α = 90
b = 115.823β = 97.89
c = 123.966γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2014-04-28 
  • Released Date: 2015-06-17 
    • Deposition Author(s): Wang, Y., Guo, S.

Revision History  (Full details and data files)

  • Version 1.0: 2015-06-17
    Type: Initial release
  • Version 1.1: 2015-07-08
    Changes: Database references
  • Version 1.2: 2015-08-26
    Changes: Other