8CGP

Insulin regulated aminopeptidase (IRAP) in complex with an allosteric aryl sulfonamide inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.62 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.170 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Mechanisms of Allosteric Inhibition of Insulin-Regulated Aminopeptidase.

Mpakali, A.Barla, I.Lu, L.Ramesh, K.M.Thomaidis, N.Stern, L.J.Giastas, P.Stratikos, E.

(2024) J Mol Biol 436: 168449-168449

  • DOI: https://doi.org/10.1016/j.jmb.2024.168449
  • Primary Citation of Related Structures:  
    8CGP, 8CGW

  • PubMed Abstract: 

    Inhibition of Insulin-Regulated Aminopeptidase is being actively explored for the treatment of several human diseases and several classes of inhibitors have been developed although no clinical applications have been reported yet. Here, we combine enzymological analysis with x-ray crystallography to investigate the mechanism employed by two of the most studied inhibitors of IRAP, an aryl sulfonamide and a 2-amino-4H-benzopyran named HFI-419. Although both compounds have been hypothesized to target the enzyme's active site by competitive mechanisms, we discovered that they instead target previously unidentified proximal allosteric sites and utilize non-competitive inhibition mechanisms. X-ray crystallographic analysis demonstrated that the aryl sulfonamide stabilizes the closed, more active, conformation of the enzyme whereas HFI-419 locks the enzyme in a semi-open, and likely less active, conformation. HFI-419 potency is substrate-dependent and fails to effectively block the degradation of the physiological substrate cyclic peptide oxytocin. Our findings demonstrate alternative mechanisms for inhibiting IRAP through allosteric sites and conformational restricting and suggest that the pharmacology of HFI-419 may be more complicated than initially considered. Such conformation-specific interactions between IRAP and small molecules can be exploited for the design of more effective second-generation allosteric inhibitors.


  • Organizational Affiliation

    Laboratory of Biochemistry, Department of Chemistry, National and Kapodistrian University of Athens, Athens 15771, Greece; National Centre for Scientific Research Demokritos, Athens 15341, Greece.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Leucyl-cystinyl aminopeptidase, pregnancy serum form
A, B
873Homo sapiensMutation(s): 0 
Gene Names: LNPEPOTASE
EC: 3.4.11.3
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UIQ6 (Homo sapiens)
Explore Q9UIQ6 
Go to UniProtKB:  Q9UIQ6
PHAROS:  Q9UIQ6
GTEx:  ENSG00000113441 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UIQ6
Glycosylation
Glycosylation Sites: 13Go to GlyGen: Q9UIQ6-1
Sequence Annotations
Expand
  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
C
6N-Glycosylation
Glycosylation Resources
GlyTouCan:  G94106MV
GlyCosmos:  G94106MV
GlyGen:  G94106MV
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
D, E, F, G, J
D, E, F, G, J, K, R, S, U
2N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Entity ID: 4
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-6)-alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
H
5N-Glycosylation
Glycosylation Resources
GlyTouCan:  G94626GC
GlyCosmos:  G94626GC
GlyGen:  G94626GC
Entity ID: 5
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
I
5N-Glycosylation
Glycosylation Resources
GlyTouCan:  G22768VO
GlyCosmos:  G22768VO
GlyGen:  G22768VO
Entity ID: 6
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
L, N, O, Q, T
3N-Glycosylation
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Entity ID: 7
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-6)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
M
6N-Glycosylation
Glycosylation Resources
GlyTouCan:  G34442SS
GlyCosmos:  G34442SS
GlyGen:  G34442SS
Entity ID: 8
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
P
6N-Glycosylation
Glycosylation Resources
GlyTouCan:  G09724ZC
GlyCosmos:  G09724ZC
GlyGen:  G09724ZC
Small Molecules
Ligands 6 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
UKG (Subject of Investigation/LOI)
Query on UKG

Download Ideal Coordinates CCD File 
AA [auth A],
LA [auth B]
4-bromanyl-5-chloranyl-~{N}-[3-(1~{H}-1,2,3,4-tetrazol-5-yl)phenyl]thiophene-2-sulfonamide
C11 H7 Br Cl N5 O2 S2
LKCZAUKSYHEDJR-UHFFFAOYSA-N
NAG
Query on NAG

Download Ideal Coordinates CCD File 
FA [auth B]
GA [auth B]
HA [auth B]
IA [auth B]
V [auth A]
FA [auth B],
GA [auth B],
HA [auth B],
IA [auth B],
V [auth A],
W [auth A],
X [auth A]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
MLT
Query on MLT

Download Ideal Coordinates CCD File 
JA [auth B],
Y [auth A]
D-MALATE
C4 H6 O5
BJEPYKJPYRNKOW-UWTATZPHSA-N
PEG
Query on PEG

Download Ideal Coordinates CCD File 
BA [auth A],
NA [auth B]
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
ZN
Query on ZN

Download Ideal Coordinates CCD File 
KA [auth B],
Z [auth A]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
EDO
Query on EDO

Download Ideal Coordinates CCD File 
CA [auth A],
DA [auth A],
EA [auth A],
MA [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.62 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.170 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.443α = 90
b = 119.074β = 102.77
c = 141.643γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXrefinement
XDSdata reduction
STARANISOdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Union (EU)European Union--

Revision History  (Full details and data files)

  • Version 1.0: 2024-01-31
    Type: Initial release
  • Version 1.1: 2024-02-14
    Changes: Database references