Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 205230.16 
• Atom Count: 14109 
• Residue Count: 1744 
• Unique protein chains: 1

4P8Q

Crystal Structure of Human Insulin Regulated Aminopeptidase with Alanine in Active Site

• DOI: 10.2210/pdb4P8Q/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda


• Deposited: 2014-03-31 Released: 2014-12-03 
• Deposition Author(s): Hermans, S.J., Ascher, D.B., Hancock, N.C., Holien, J.K., Michell, B., Morton, C.J., Parker, M.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.02 Å
• R-Value Free: 0.250 
• R-Value Work: 0.190 

Literature

Crystal structure of human insulin-regulated aminopeptidase with specificity for cyclic peptides.

Hermans, S.J., Ascher, D.B., Hancock, N.C., Holien, J.K., Michell, B.J., Yeen Chai, S., Morton, C.J., Parker, M.W.

(2015) Protein Sci. 24: 190-199

• PubMed: 25408552 
• DOI: 10.1002/pro.2604
• Primary Citation of Related Structures:  
  4PJ6


• PubMed Abstract: 
  

Insulin-regulated aminopeptidase (IRAP or oxytocinase) is a membrane-bound zinc-metallopeptidase that cleaves neuroactive peptides in the brain and produces memory enhancing effects when inhibited. We have determined the crystal structure of human IRAP revealing a closed, four domain arrangement with a large, mostly buried cavity abutting the active site. The structure reveals that the GAMEN exopeptidase loop adopts a very different conformation from other aminopeptidases, thus explaining IRAP's unique specificity for cyclic peptides such as oxytocin and vasopressin. Computational docking of a series of IRAP-specific cognitive enhancers into the crystal structure provides a molecular basis for their structure-activity relationships and demonstrates that the structure will be a powerful tool in the development of new classes of cognitive enhancers for treating a variety of memory disorders such as Alzheimer's disease.

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Organizational Affiliation: 

ACRF Rational Drug Discovery Centre, St. Vincent's Institute of Medical Research, Fitzroy, Melbourne, Victoria, 3065, Australia.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Leucyl-cystinyl aminopeptidase	A, B	872	Homo sapiens	Mutation(s): 0  Gene Names: LNPEP (OTASE) EC: 3.4.11.3
Find proteins for Q9UIQ6 (Homo sapiens) Go to Gene View: LNPEP Go to UniProtKB:  Q9UIQ6

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ZN	A, B	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
NAG	A, B	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.02 Å
• R-Value Free: 0.250 
• R-Value Work: 0.190 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 68.323	α = 90.00
b = 256.051	β = 115.12
c = 71.132	γ = 90.00

Software Package:

Software Name	Purpose
BUSTER	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-03-31 
• Released Date: 2014-12-03 
• Deposition Author(s): Hermans, S.J., Ascher, D.B., Hancock, N.C., Holien, J.K., Michell, B., Morton, C.J., Parker, M.W.

Revision History 

• Version 1.0: 2014-12-03
  Type: Initial release
• Version 1.1: 2015-02-11
  Type: Database references