1LQ8

Crystal structure of cleaved protein C inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.222 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structure of Protein C Inhibitor Provides Insights into Hormone Binding and Heparin Activation

Huntington, J.A.Kjellberg, M.Stenflo, J.

(2003) Structure 11: 205-211

  • Also Cited By: 2OL2

  • PubMed Abstract: 
  • Protein C inhibitor (PCI) is a member of the serpin family that has many biological functions. In blood it acts as a procoagulant, and, in the seminal vesicles, it is required for spermatogenesis. The activity of PCI is affected by heparin binding in ...

    Protein C inhibitor (PCI) is a member of the serpin family that has many biological functions. In blood it acts as a procoagulant, and, in the seminal vesicles, it is required for spermatogenesis. The activity of PCI is affected by heparin binding in a manner unique among the heparin binding serpins, and, in addition, PCI binds hydrophobic hormones with apparent specificity for retinoids. Here we present the 2.4 A crystallographic structure of reactive center loop (RCL) cleaved PCI. A striking feature of the structure is a two-turn N-terminal shortening of helix A, which creates a large hydrophobic pocket that docking studies indicate to be the retinoid binding site. On the basis of surface electrostatic properties, a novel mechanism for heparin activation is proposed.


    Organizational Affiliation

    Department of Haematology, Division of Structural Medicine, University of Cambridge, Cambridge Institute for Medical Research, Wellcome Trust/MRC Building, Hills Road, CB2 2XY, Cambridge, United Kingdom. jah52@cam.ac.uk




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
plasma serine protease inhibitor
A, C, E, G
346Homo sapiensMutation(s): 0 
Gene Names: SERPINA5 (PCI, PLANH3, PROCI)
Find proteins for P05154 (Homo sapiens)
Go to Gene View: SERPINA5
Go to UniProtKB:  P05154
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
plasma serine protease inhibitor
B, D, F, H
31Homo sapiensMutation(s): 0 
Gene Names: SERPINA5 (PCI, PLANH3, PROCI)
Find proteins for P05154 (Homo sapiens)
Go to Gene View: SERPINA5
Go to UniProtKB:  P05154
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MAN
Query on MAN

Download SDF File 
Download CCD File 
G
ALPHA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-PQMKYFCFSA-N
 Ligand Interaction
IPA
Query on IPA

Download SDF File 
Download CCD File 
A, C, G
ISOPROPYL ALCOHOL
2-PROPANOL
C3 H8 O
KFZMGEQAYNKOFK-UHFFFAOYSA-N
 Ligand Interaction
NDG
Query on NDG

Download SDF File 
Download CCD File 
A, C, G
2-(ACETYLAMINO)-2-DEOXY-A-D-GLUCOPYRANOSE
C8 H15 N O6
OVRNDRQMDRJTHS-PVFLNQBWSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, C
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.222 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 55.200α = 90.00
b = 244.030β = 91.98
c = 66.400γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
CNSrefinement
SCALEPACKdata scaling
MOLREPphasing
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-02-11
    Type: Initial release
  • Version 1.1: 2007-10-16
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance