4BQD

KD1 of human TFPI in complex with a synthetic peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.48 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.227 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Small Peptides Blocking Inhibition of Factor Xa and Tissue Factor-Factor Viia by Tissue Factor Pathway Inhibitor (Tfpi)

Dockal, M.Hartman, R.Fries, M.Christella, M.Thomassen, L.G.D.Heizman, A.Ehrlich, H.Rosing, J.Osterkamp, F.Polakowski, T.Reineke, U.Griessner, A.Brandstetter, H.Scheiflinger, F.

(2014) J.Biol.Chem. 289: 1732

  • DOI: 10.1074/jbc.M113.533836

  • PubMed Abstract: 
  • Tissue factor pathway inhibitor (TFPI) is a Kunitz-type protease inhibitor that inhibits activated factor X (FXa) via a slow-tight binding mechanism and tissue factor-activated FVII (TF-FVIIa) via formation of a quaternary FXa-TFPI-TF-FVIIa complex. ...

    Tissue factor pathway inhibitor (TFPI) is a Kunitz-type protease inhibitor that inhibits activated factor X (FXa) via a slow-tight binding mechanism and tissue factor-activated FVII (TF-FVIIa) via formation of a quaternary FXa-TFPI-TF-FVIIa complex. Inhibition of TFPI enhances coagulation in hemophilia models. Using a library approach, we selected and subsequently optimized peptides that bind TFPI and block its anticoagulant activity. One peptide (termed compound 3), bound with high affinity to the Kunitz-1 (K1) domain of TFPI (Kd ∼1 nM). We solved the crystal structure of this peptide in complex with the K1 of TFPI at 2.55-Å resolution. The structure of compound 3 can be segmented into a N-terminal anchor; an Ω-shaped loop; an intermediate segment; a tight glycine-loop; and a C-terminal α-helix that is anchored to K1 at its reactive center loop and two-stranded β-sheet. The contact surface has an overall hydrophobic character with some charged hot spots. In a model system, compound 3 blocked FXa inhibition by TFPI (EC50 = 11 nM) and inhibition of TF-FVIIa-catalyzed FX activation by TFPI (EC50 = 2 nM). The peptide prevented transition from the loose to the tight FXa-TFPI complex, but did not affect formation of the loose FXa-TFPI complex. The K1 domain of TFPI binds and inhibits FVIIa and the K2 domain similarly inhibits FXa. Because compound 3 binds to K1, our data show that K1 is not only important for FVIIa inhibition but also for FXa inhibition, i.e. for the transition of the loose to the tight FXa-TFPI complex. This mode of action translates into normalization of coagulation of hemophilia plasmas. Compound 3 thus bears potential to prevent bleeding in hemophilia patients.


    Organizational Affiliation

    From Baxter Innovations GmbH, Uferstrasse 15, A-2304 Orth/Donau, Austria.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TISSUE FACTOR PATHWAY INHIBITOR (LIPOPROTEIN-ASSOCIATED COAGULATION INHIBITOR) VARIANT
A, B
79Homo sapiensMutation(s): 0 
Gene Names: TFPI (LACI, TFPI1)
Find proteins for P10646 (Homo sapiens)
Go to Gene View: TFPI
Go to UniProtKB:  P10646
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PEPTIDE
C, D
21N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
AIB
Query on AIB
C, D
L-PEPTIDE LINKINGC4 H9 N O2ALA
ACE
Query on ACE
C, D
NON-POLYMERC2 H4 O

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.48 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.227 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 113.670α = 90.00
b = 69.320β = 92.97
c = 42.370γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-12-04
    Type: Initial release
  • Version 1.1: 2013-12-11
    Type: Database references
  • Version 1.2: 2014-02-05
    Type: Database references
  • Version 1.3: 2015-03-25
    Type: Database references