1NSA

THREE-DIMENSIONAL STRUCTURE OF PORCINE PROCARBOXYPEPTIDASE B: A STRUCTURAL BASIS OF ITS INACTIVITY


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Work: 0.169 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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: 1-9


  • PubMed Abstract: 
  • Procarboxypeptidase B is converted to enzymatically active carboxypeptidase B by limited proteolysis catalysed by trypsin, removing the long N-terminal activation segment of 95 amino acids. The three-dimensional crystal structure of procarboxypeptida ...

    Procarboxypeptidase B is converted to enzymatically active carboxypeptidase B by limited proteolysis catalysed by trypsin, removing the long N-terminal activation segment of 95 amino acids. The three-dimensional crystal structure of procarboxypeptidase B from porcine pancreas has been determined at 2.3 A resolution and refined to a crystallographic R-factor of 0.169. The functional determinants of its enzymatic inactivity and of its activation by limited proteolysis have thus been unveiled. The activation segment folds in a globular region with an open sandwich antiparallel-alpha antiparallel-beta topology and in a C terminal alpha-helix which connects it to the enzyme moiety. The globular region (A7-A82) shields the preformed active site, and establishes specific interactions with residues important for substrate recognition. AspA41 forms a salt bridge with Arg145, which in active carboxypeptidase binds the C-terminal carboxyl group of substrate molecules. The connecting region occupies the putative extended substrate binding site. The scissile peptide bond cleaved by trypsin during activation is very exposed. Its cleavage leads to the release of the activation segment and to exposure of the substrate binding site. An open-sandwich folding has been observed in a number of other proteins and protein domains. One of them is the C-terminal fragment of L7/L12, a ribosomal protein from Escherichia coli that displays a topology similar to the activation domain of procarboxypeptidase.


    Organizational Affiliation

    Max-Planck-Institut für Biochemie, Martinsried bei München, FRG.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROCARBOXYPEPTIDASE B
A
395Sus scrofaGene Names: CPB1 (CPB)
EC: 3.4.17.2
Find proteins for P09955 (Sus scrofa)
Go to Gene View: CPB1
Go to UniProtKB:  P09955
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
BEN
Query on BEN

Download SDF File 
Download CCD File 
A
BENZAMIDINE
C7 H8 N2
PXXJHWLDUBFPOL-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Work: 0.169 
  • Space Group: P 43
Unit Cell:
Length (Å)Angle (°)
a = 103.100α = 90.00
b = 103.100β = 90.00
c = 46.600γ = 90.00
Software Package:
Software NamePurpose
MADNESdata collection
EREFrefinement
MADNESdata reduction
FRODOmodel building
ABSCORdata scaling
ABSCORdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1997-07-25 
  • Released Date: 1997-12-24 
  • Deposition Author(s): Huber, R.

Revision History 

  • Version 1.0: 1997-12-24
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance