4OU3

Crystal structure of porcine aminopeptidase N complexed with CNGRCG tumor-homing peptide

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.140 

wwPDB Validation 3D Report Full Report


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

Literature

A Unified Mechanism for Aminopeptidase N-based Tumor Cell Motility and Tumor-homing Therapy.

Liu, C., Yang, Y., Chen, L., Lin, Y.L., Li, F.

(2014) J.Biol.Chem. 289: 34520-34529

  • DOI: 10.1074/jbc.M114.566802

  • PubMed Abstract: 

    • Tumor cell surface aminopeptidase N (APN or CD13) has two puzzling functions unrelated to its enzymatic activity: mediating tumor cell motility and serving as a receptor for tumor-homing peptides (peptides that bring anti-cancer drugs to tumor cells) ...

    Tumor cell surface aminopeptidase N (APN or CD13) has two puzzling functions unrelated to its enzymatic activity: mediating tumor cell motility and serving as a receptor for tumor-homing peptides (peptides that bring anti-cancer drugs to tumor cells). To investigate APN-based tumor-homing therapy, we determined the crystal structure of APN complexed with a tumor-homing peptide containing a representative Asn-Gly-Arg (NGR) motif. The tumor-homing peptide binds to the APN enzymatic active site, but it resists APN degradation due to a distorted scissile peptide bond. To explore APN-based tumor cell motility, we examined the interactions between APN and extracellular matrix (ECM) proteins. APN binds to, but does not degrade, NGR motifs in ECM proteins that share similar conformations with the NGR motif in the APN-bound tumor-homing peptide. Therefore, APN-based tumor cell motility and tumor-homing therapy rely on a unified mechanism in which both functions are driven by the specific and stable interactions between APN and the NGR motifs in ECM proteins and tumor-homing peptides. This study further implicates APN as an integrin-like molecule that functions broadly in cell motility and adhesion by interacting with its signature NGR motifs in the extracellular environment.

    Organizational Affiliation: 

    From the Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota 55455.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Aminopeptidase N
A
908Sus scrofaMutation(s): 0 
Gene Names: ANPEP
EC: 3.4.11.2
Find proteins for P15145 (Sus scrofa)
Go to Gene View: ANPEP
Go to UniProtKB:  P15145
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
tumor-homing peptide
B
6N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN
Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4
Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
NAG
Query on NAG
Download SDF File 
Download CCD File 
A
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.140 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 260.323α = 90.00
b = 62.879β = 100.59
c = 82.023γ = 90.00
Software Package:
Software NamePurpose
CCP4phasing
REFMACrefinement
HKL-2000data scaling
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-11-05
    Type: Initial release
  • Version 1.1: 2014-11-19
    Type: Database references
  • Version 1.2: 2015-01-14
    Type: Database references