4P8Q

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.02 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 

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This is version 2.0 of the entry. See complete history


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

  • DOI: 10.1002/pro.2604
  • Primary Citation of Related Structures:  
    4P8Q, 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 ...

    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.


    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Leucyl-cystinyl aminopeptidaseA, B872Homo 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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UIQ6
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseC, D, E, F, G 2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.02 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.323α = 90
b = 256.051β = 115.12
c = 71.132γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-12-03
    Type: Initial release
  • Version 1.1: 2015-02-11
    Changes: Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Other, Refinement description, Source and taxonomy, Structure summary