1AYE

HUMAN PROCARBOXYPEPTIDASE A2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.178 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The three-dimensional structure of human procarboxypeptidase A2. Deciphering the basis of the inhibition, activation and intrinsic activity of the zymogen.

Garcia-Saez, I.Reverter, D.Vendrell, J.Aviles, F.X.Coll, M.

(1997) EMBO J. 16: 6906-6913

  • DOI: 10.1093/emboj/16.23.6906

  • PubMed Abstract: 
  • The three-dimensional structure of human procarboxypeptidase A2 has been determined using X-ray crystallography at 1.8 A resolution. This is the first detailed structural report of a human pancreatic carboxypeptidase and of its zymogen. Human procarb ...

    The three-dimensional structure of human procarboxypeptidase A2 has been determined using X-ray crystallography at 1.8 A resolution. This is the first detailed structural report of a human pancreatic carboxypeptidase and of its zymogen. Human procarboxypeptidase A2 is formed by a pro-segment of 96 residues, which inhibits the enzyme, and a carboxypeptidase moiety of 305 residues. The pro-enzyme maintains the general fold when compared with other non-human counterparts. The globular part of the pro-segment docks into the enzyme moiety and shields the S2-S4 substrate binding sites, promoting inhibition. Interestingly, important differences are found in the pro-segment which allow the identification of the structural determinants of the diverse activation behaviours of procarboxypeptidases A1, B and A2, particularly of the latter. The benzylsuccinic inhibitor is able to diffuse into the active site of procarboxypeptidase A2 in the crystals. The structure of the zymogen-inhibitor complex has been solved at 2.2 A resolution. The inhibitor enters the active site through a channel formed at the interface between the pro-segment and the enzyme regions and interacts with important elements of the active site. The derived structural features explain the intrinsic activity of A1/A2 pro-enzymes for small substrates.


    Related Citations: 
    • Three-Dimensional Structure of Porcine Pancreatic Procarboxypeptidase A. A Comparison of the a and B Zymogens and Their Determinants for Inhibition and Activation
      Guasch, A.,Coll, M.,Aviles, F.X.,Huber, R.
      (1992) J.Mol.Biol. 224: 141
    • Three-Dimensional Structure of Porcine Procarboxypeptidase B: A Structural Basis of its Inactivity
      Coll, M.,Guasch, A.,Aviles, F.X.,Huber, R.
      (1991) Embo J. 10: 1


    Organizational Affiliation

    Departament de Biologia Molecular i Cel.lular, Centre d'Investigació i Desenvolupament-CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROCARBOXYPEPTIDASE A2
A
401Homo sapiensGene Names: CPA2
EC: 3.4.17.15
Find proteins for P48052 (Homo sapiens)
Go to Gene View: CPA2
Go to UniProtKB:  P48052
Small Molecules
Ligands 1 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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.178 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 42.200α = 90.00
b = 87.070β = 99.35
c = 59.020γ = 90.00
Software Package:
Software NamePurpose
X-PLORphasing
DENZOdata reduction
X-PLORrefinement
X-PLORmodel building
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-01-13
    Type: Initial release
  • Version 1.1: 2008-03-10
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance