4KX8

Crystal structure of human aminopeptidase A complexed with amastatin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.210 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural insights into central hypertension regulation by human aminopeptidase a.

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

(2013) J.Biol.Chem. 288: 25638-25645

  • DOI: 10.1074/jbc.M113.494955
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Hypertension is regulated through both the central and systemic renin-angiotensin systems. In the central renin-angiotensin system, zinc-dependent aminopeptidase A (APA) up-regulates blood pressure by specifically cleaving the N-terminal aspartate, b ...

    Hypertension is regulated through both the central and systemic renin-angiotensin systems. In the central renin-angiotensin system, zinc-dependent aminopeptidase A (APA) up-regulates blood pressure by specifically cleaving the N-terminal aspartate, but not the adjacent arginine, from angiotensin II, a process facilitated by calcium. Here, we determined the crystal structures of human APA and its complexes with different ligands and identified a calcium-binding site in the S1 pocket of APA. Without calcium, the S1 pocket can bind both acidic and basic residues through formation of salt bridges with the charged side chains. In the presence of calcium, the binding of acidic residues is enhanced as they ligate the cation, whereas the binding of basic residues is no longer favorable due to charge repulsion. Of the peptidomimetic inhibitors of APA, amastatin has higher potency than bestatin by fitting better in the S1 pocket and interacting additionally with the S3' subsite. These results explain the calcium-modulated substrate specificity of APA in central hypertension regulation and can guide the design and development of brain-targeting antihypertensive APA inhibitors.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutamyl aminopeptidase
A
888Homo sapiensMutation(s): 0 
Gene Names: ENPEP
EC: 3.4.11.7
Find proteins for Q07075 (Homo sapiens)
Go to Gene View: ENPEP
Go to UniProtKB:  Q07075
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
amastatin
C
4N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 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
NAG
Query on NAG

Download SDF File 
Download CCD File 
A
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000415
Query on PRD_000415
CAmastatinPeptide-like / Inhibitor

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.210 
  • Space Group: P 64 2 2
Unit Cell:
Length (Å)Angle (°)
a = 142.742α = 90.00
b = 142.742β = 90.00
c = 237.811γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-07-31
    Type: Initial release
  • Version 1.1: 2013-08-07
    Type: Structure summary
  • Version 1.2: 2013-09-04
    Type: Database references
  • Version 1.3: 2013-10-09
    Type: Database references