1PYT

TERNARY COMPLEX OF PROCARBOXYPEPTIDASE A, PROPROTEINASE E, AND CHYMOTRYPSINOGEN C


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The three-dimensional structure of the native ternary complex of bovine pancreatic procarboxypeptidase A with proproteinase E and chymotrypsinogen C.

Gomis-Ruth, F.X.Gomez, M.Bode, W.Huber, R.Aviles, F.X.

(1995) EMBO J. 14: 4387-4394


  • PubMed Abstract: 
  • The metalloexozymogen procarboxypeptidase A is mainly secreted in ruminants as a ternary complex with zymogens of two serine endoproteinases, chymotrypsinogen C and proproteinase E. The bovine complex has been crystallized, and its molecular structur ...

    The metalloexozymogen procarboxypeptidase A is mainly secreted in ruminants as a ternary complex with zymogens of two serine endoproteinases, chymotrypsinogen C and proproteinase E. The bovine complex has been crystallized, and its molecular structure analysed and refined at 2.6 A resolution to an R factor of 0.198. In this heterotrimer, the activation segment of procarboxypeptidase A essentially clamps the other two subunits, which shield the activation sites of the former from tryptic attack. In contrast, the propeptides of both serine proproteinases are freely accessible to trypsin. This arrangement explains the sequential and delayed activation of the constituent zymogens. Procarboxypeptidase A is virtually identical to the homologous monomeric porcine form. Chymotrypsinogen C displays structural features characteristic for chymotrypsins as well as elastases, except for its activation domain; similar to bovine chymotrypsinogen A, its binding site is not properly formed, while its surface located activation segment is disordered. The proproteinase E structure is fully ordered and strikingly similar to active porcine elastase; its specificity pocket is occluded, while the activation segment is fixed to the molecular surface. This first structure of a native zymogen from the proteinase E/elastase family does not fundamentally differ from the serine proproteinases known so far.


    Related Citations: 
    • Procarboxypeptidase A-S6 : Detailed Structure Analysis of the Constituting Subunits and Implications for Their Activation
      Gomis-Ruth, F.X.,Gomez, M.,Vendrell, J.,Ventura, S.,Bode, W.,Huber, R.,Aviles, F.X.
      () TO BE PUBLISHED --: --


    Organizational Affiliation

    Institut de Biologia Fonamental, Universitat Autònoma de Barcelona, Bellaterra, Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROCARBOXYPEPTIDASE A
A
94Bos taurusMutation(s): 0 
Gene Names: CPA1 (CPA)
EC: 3.4.17.1
Find proteins for P00730 (Bos taurus)
Go to Gene View: CPA1
Go to UniProtKB:  P00730
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROCARBOXYPEPTIDASE A
B
309Bos taurusMutation(s): 0 
Gene Names: CPA1 (CPA)
EC: 3.4.17.1
Find proteins for P00730 (Bos taurus)
Go to Gene View: CPA1
Go to UniProtKB:  P00730
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
PROPROTEINASE E
C
253Bos taurusMutation(s): 0 
Find proteins for P05805 (Bos taurus)
Go to UniProtKB:  P05805
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
CHYMOTRYPSINOGEN C
D
251Bos taurusMutation(s): 0 
Gene Names: CTRC
EC: 3.4.21.2
Find proteins for Q7M3E1 (Bos taurus)
Go to Gene View: CTRC
Go to UniProtKB:  Q7M3E1
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
C
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.192 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 188.500α = 90.00
b = 188.500β = 90.00
c = 82.500γ = 120.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
X-PLORphasing
X-PLORrefinement
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-01-27
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance