4AJT

The crystal structure of mouse protein-Z dependent protease inhibitor(mZPI)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.229 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Basis for Catalytic Activation of Protein Z-Dependent Protease Inhibitor (Zpi) by Protein Z.

Huang, X.Yan, Y.TU, Y.Gatti, J.Broze, G.J.J.Zhou, A.Olson, S.T.

(2012) Blood 120: 1726

  • DOI: 10.1182/blood-2012-03-419598
  • Primary Citation of Related Structures:  4AFX, 4AJU

  • PubMed Abstract: 
  • The anticoagulant serpin, protein Z-dependent protease inhibitor (ZPI), is catalytically activated by its cofactor, protein Z (PZ), to regulate the function of blood coagulation factor Xa on membrane surfaces. The X-ray structure of the ZPI-PZ comple ...

    The anticoagulant serpin, protein Z-dependent protease inhibitor (ZPI), is catalytically activated by its cofactor, protein Z (PZ), to regulate the function of blood coagulation factor Xa on membrane surfaces. The X-ray structure of the ZPI-PZ complex has shown that PZ binds to a unique site on ZPI centered on helix G. In the present study, we show by Ala-scanning mutagenesis of the ZPI-binding interface, together with native PAGE and kinetic analyses of PZ binding to ZPI, that Tyr240 and Asp293 of ZPI are crucial hot spots for PZ binding. Complementary studies with protein Z-protein C chimeras show the importance of both pseudocatalytic and EGF2 domains of PZ for the critical ZPI interactions. To understand how PZ acts catalytically, we analyzed the interaction of reactive loop-cleaved ZPI (cZPI) with PZ and determined the cZPI X-ray structure. The cZPI structure revealed changes in helices A and G of the PZ-binding site relative to native ZPI that rationalized an observed 6-fold loss in PZ affinity and PZ catalytic action. These findings identify the key determinants of catalytic activation of ZPI by PZ and suggest novel strategies for ameliorating hemophilic states through drugs that disrupt the ZPI-PZ interaction.


    Organizational Affiliation

    Center for Molecular Biology of Oral Diseases, University of Illinois at Chicago, Chicago, IL 60612, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN Z-DEPENDENT PROTEASE INHIBITOR
A
427Mus musculusGene Names: Serpina10 (Zpi)
Find proteins for Q8R121 (Mus musculus)
Go to UniProtKB:  Q8R121
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.229 
  • Space Group: P 32 1 2
Unit Cell:
Length (Å)Angle (°)
a = 83.530α = 90.00
b = 83.530β = 90.00
c = 181.260γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
CCP4data scaling
CCP4phasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2012-02-19 
  • Released Date: 2012-12-05 
  • Deposition Author(s): Yan, Y., Zhou, A.

Revision History 

  • Version 1.0: 2012-12-05
    Type: Initial release
  • Version 1.1: 2012-12-26
    Type: Database references
  • Version 1.2: 2013-04-24
    Type: Structure summary