1KTS

Thrombin Inhibitor Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Structure-based design of novel potent nonpeptide thrombin inhibitors.

Hauel, N.H.Nar, H.Priepke, H.Ries, U.Stassen, J.M.Wienen, W.

(2002) J.Med.Chem. 45: 1757-1766

  • Primary Citation of Related Structures:  1KTT

  • PubMed Abstract: 
  • The clinical syndromes of thromboembolism are evoked by an excessive stimulation of the coagulation cascade. In this context, the serine protease thrombin plays a key role. Considerable efforts have therefore been devoted to the discovery of safe, or ...

    The clinical syndromes of thromboembolism are evoked by an excessive stimulation of the coagulation cascade. In this context, the serine protease thrombin plays a key role. Considerable efforts have therefore been devoted to the discovery of safe, orally active inhibitors of this enzyme. On the basis of the X-ray crystal structure of the peptide-like thrombin inhibitor NAPAP complexed with bovine thrombin, we have designed a new structural class of nonpeptidic inhibitors employing a 1,2,5-trisubstituted benzimidazole as the central scaffold. Supported by a series of X-ray structure analyses, we optimized the activity of these compounds. Thrombin inhibition in the lower nanomolar range could be achieved although the binding energy mainly results from nonpolar, hydrophobic interactions. To improve in vivo potency, we increased the overall hydrophilicity of the molecules by introducing carboxylate groups. The very polar compound 24 (BIBR 953) exhibited the most favorable activity profile in vivo. This zwitterionic molecule was converted into the double-prodrug 31 (BIBR 1048), which showed strong oral activity in different animal species. On the basis of these results, 31 was chosen for clinical development.


    Organizational Affiliation

    Boehringer Ingelheim Pharma KG, Research Division, Birkendorfer Strasse 65, D-88397 Biberach/RISS, Germany. norbert.hauel@bc.boehringer-ingelheim.de




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
thrombin
A
36Homo sapiensGene Names: F2
EC: 3.4.21.5
Find proteins for P00734 (Homo sapiens)
Go to Gene View: F2
Go to UniProtKB:  P00734
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
thrombin
B
259Homo sapiensGene Names: F2
EC: 3.4.21.5
Find proteins for P00734 (Homo sapiens)
Go to Gene View: F2
Go to UniProtKB:  P00734
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
hirudin IIB
C
11Hirudo medicinalisN/A
Find proteins for P28506 (Hirudo medicinalis)
Go to UniProtKB:  P28506
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
C24
Query on C24

Download SDF File 
Download CCD File 
B
3-({2-[(4-CARBAMIMIDOYL-PHENYLAMINO)-METHYL]-3-METHYL-3H-BENZOIMIDAZOLE-5-CARBONYL}-PYRIDIN-2-YL-AMINO)-PROPIONIC ACID ETHYL ESTER
C27 H29 N7 O3
BGLLICFSSKPUMR-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TYS
Query on TYS
C
L-PEPTIDE LINKINGC9 H11 N O6 STYR
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
4CCIC50: 1.2 - 10 nM (100) BINDINGDB
4CCKi: 4.5 - 6.3 nM (100) BINDINGDB
C24Ki: 4.5 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.211 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 69.900α = 90.00
b = 71.000β = 99.80
c = 72.200γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
X-PLORrefinement
X-PLORphasing
X-PLORmodel building
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2002-01-17 
  • Released Date: 2002-02-06 
  • Deposition Author(s): Nar, H.

Revision History 

  • Version 1.0: 2002-02-06
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 1.3: 2012-12-12
    Type: Other
  • Version 1.4: 2013-03-13
    Type: Other