Crystal structure of porcine aminopeptidase-N

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.142 
  • R-Value Observed: 0.144 

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This is version 2.0 of the entry. See complete history


Structural basis for multifunctional roles of mammalian aminopeptidase N.

Chen, L.Lin, Y.L.Peng, G.Li, F.

(2012) Proc Natl Acad Sci U S A 109: 17966-17971

  • DOI: https://doi.org/10.1073/pnas.1210123109
  • Primary Citation of Related Structures:  
    4FKE, 4FKH, 4FKK, 4HOM, 4NAQ, 4NZ8

  • PubMed Abstract: 

    Mammalian aminopeptidase N (APN) plays multifunctional roles in many physiological processes, including peptide metabolism, cell motility and adhesion, and coronavirus entry. Here we determined crystal structures of porcine APN at 1.85 Å resolution and its complexes with a peptide substrate and a variety of inhibitors. APN is a cell surface-anchored and seahorse-shaped zinc-aminopeptidase that forms head-to-head dimers. Captured in a catalytically active state, these structures of APN illustrate a detailed catalytic mechanism for its aminopeptidase activity. The active site and peptide-binding channel of APN reside in cavities with wide openings, allowing easy access to peptides. The cavities can potentially open up further to bind the exposed N terminus of proteins. The active site anchors the N-terminal neutral residue of peptides/proteins, and the peptide-binding channel binds the remainder of the peptides/proteins in a sequence-independent fashion. APN also provides an exposed outer surface for coronavirus binding, without its physiological functions being affected. These structural features enable APN to function ubiquitously in peptide metabolism, interact with other proteins to mediate cell motility and adhesion, and serve as a coronavirus receptor. This study elucidates multifunctional roles of APN and can guide therapeutic efforts to treat APN-related diseases.

  • Organizational Affiliation

    Department of Pharmacology, University of Minnesota Medical School, Minneapolis, MN 55455, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aminopeptidase N909Sus scrofaMutation(s): 0 
Gene Names: ANPEP
Find proteins for P15145 (Sus scrofa)
Explore P15145 
Go to UniProtKB:  P15145
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP15145
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
B, C, F
Glycosylation Resources
GlyTouCan:  G47362BJ
GlyCosmos:  G47362BJ
GlyGen:  G47362BJ
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
D, E, G, H, I
D, E, G, H, I, J
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.142 
  • R-Value Observed: 0.144 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 259.971α = 90
b = 62.77β = 100.12
c = 81.794γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
HKL-2000data collection

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-10-17
    Type: Initial release
  • Version 1.1: 2012-10-31
    Changes: Database references, Structure summary
  • Version 1.2: 2012-11-14
    Changes: Database references
  • Version 1.3: 2019-07-17
    Changes: Data collection, Derived calculations, Refinement description
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary