4CI9

Crystal structure of cathepsin A, apo-structure


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.166 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Crystal structure of cathepsin A, a novel target for the treatment of cardiovascular diseases.

Schreuder, H.A.Liesum, A.Kroll, K.Bohnisch, B.Buning, C.Ruf, S.Sadowski, T.

(2014) Biochem Biophys Res Commun 445: 451-456

  • DOI: 10.1016/j.bbrc.2014.02.014
  • Primary Citation of Related Structures:  
    4CI9, 4CIB, 4CIA

  • PubMed Abstract: 
  • The lysosomal serine carboxypeptidase cathepsin A is involved in the breakdown of peptide hormones like endothelin and bradykinin. Recent pharmacological studies with cathepsin A inhibitors in rodents showed a remarkable reduction in cardiac hypertrophy and atrial fibrillation, making cathepsin A a promising target for the treatment of heart failure ...

    The lysosomal serine carboxypeptidase cathepsin A is involved in the breakdown of peptide hormones like endothelin and bradykinin. Recent pharmacological studies with cathepsin A inhibitors in rodents showed a remarkable reduction in cardiac hypertrophy and atrial fibrillation, making cathepsin A a promising target for the treatment of heart failure. Here we describe the crystal structures of activated cathepsin A without inhibitor and with two compounds that mimic the tetrahedral intermediate and the reaction product, respectively. The structure of activated cathepsin A turned out to be very similar to the structure of the inactive precursor. The only difference was the removal of a 40 residue activation domain, partially due to proteolytic removal of the activation peptide, and partially by an order-disorder transition of the peptides flanking the removed activation peptide. The termini of the catalytic core are held together by the Cys253-Cys303 disulfide bond, just before and after the activation domain. One of the compounds we soaked in our crystals reacted covalently with the catalytic Ser150 and formed a tetrahedral intermediate. The other compound got cleaved by the enzyme and a fragment, resembling one of the natural reaction products, was found in the active site. These studies establish cathepsin A as a classical serine proteinase with a well-defined oxyanion hole. The carboxylate group of the cleavage product is bound by a hydrogen-bonding network involving one aspartate and two glutamate side chains. This network can only form if at least half of the carboxylate groups involved are protonated, which explains the acidic pH optimum of the enzyme.


    Related Citations: 
    • Novel Beta-Amino Acid Derivatives as Inhibitors of Cathepsin A.
      Ruf, S., Buning, C., Schreuder, H., Horstick, G., Linz, W., Olpp, T., Pernerstorfer, J., Hiss, K., Kroll, K., Kannt, A., Kohlmann, M., Linz, D., Hubschle, T., Rutten, H., Wirth, K., Schmidt, T., Sadowski, T.
      (2012) J Med Chem 55: 7636

    Organizational Affiliation

    Sanofi-Aventis Pharma Deutschland GmbH, Industriepark Höchst, 65926 Frankfurt am Main, Germany. Electronic address: thorsten.sadowski@sanofi.com.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
LYSOSOMAL PROTECTIVE PROTEIN A455Homo sapiensMutation(s): 0 
Gene Names: CTSAPPGB
EC: 3.4.16.5
Find proteins for P10619 (Homo sapiens)
Explore P10619 
Go to UniProtKB:  P10619
NIH Common Fund Data Resources
PHAROS:  P10619
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
B, C
2 N-Glycosylation Oligosaccharides Interaction
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

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A
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
DMS
Query on DMS

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A
DIMETHYL SULFOXIDE
C2 H6 O S
IAZDPXIOMUYVGZ-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

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A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.166 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.31α = 90
b = 102.03β = 101.27
c = 48.55γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-02-26
    Type: Initial release
  • Version 1.1: 2014-04-02
    Changes: Database references
  • Version 1.2: 2019-03-13
    Changes: Data collection, Database references, Derived calculations, Experimental preparation, Other
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Structure summary