Human procarboxypeptidase A4.

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.221 

wwPDB Validation   3D Report Full Report

This is version 2.0 of the entry. See complete history


Detailed Molecular Comparison between the Inhibition Mode of A/B-Type Carboxypeptidases in the Zymogen State and by the Endogenous Inhibitor Latexin.

Garcia-Castellanos, R.Bonet-Figueredo, R.Pallares, I.Ventura, S.Aviles, F.X.Vendrell, J.Gomis-Ruth, F.X.

(2005) Cell Mol Life Sci 62: 1996

  • DOI: https://doi.org/10.1007/s00018-005-5174-4
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Treatment of advanced stages of prostate carcinoma with histone-deacetylase inhibitors entails expression of human procarboxypeptidase-A4 (hPCPA4). The three-dimensional structure of hPCPA4 has been solved and shows the features of related metallocarboxypeptidase zymogens, with a preformed alpha/beta/-hydrolase active-enzyme moiety (hCPA4) and an inhibiting pro-domain (PD). The protease moiety recalls a sphere, out of which a spherical cone has been cut. This results in a funnel-like structure, at the bottom of which the active-site cleft resides. The border of this funnel is shaped by loops, which are responsible for the interaction with the PD, characterised by a large interface area and relatively few contacts. Such an inhibitory mode is evocative of the recently reported structure of the human inhibitor latexin in its complex with hCPA4. The main contacting structure of latexin is similar to the one employed for PD inhibition. In both cases, active-site blocking relies mainly on a loop provided by the central part of a beta sheet.

  • Organizational Affiliation

    Institut de Biologia Molecular de Barcelona, C.I.D. - C.S.I.C., C/Jordi Girona 18-26, 08034, Barcelona, Spain.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
404Homo sapiensMutation(s): 0 
Gene Names: CPA4CPA3UNQ694/PRO1339
EC: 3.4.17
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UI42 (Homo sapiens)
Explore Q9UI42 
Go to UniProtKB:  Q9UI42
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UI42
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.221 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 136.8α = 90
b = 87.2β = 117.2
c = 89.7γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-12-13
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-07-12
    Changes: Derived calculations
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary