2CF9

Complex of recombinant human thrombin with an inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.79 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.162 

wwPDB Validation   3D Report Full Report


This is version 1.6 of the entry. See complete history


Literature

Multipolar Interactions in the D Pocket of Thrombin: Large Differences between Tricyclic Imide and Lactam Inhibitors.

Schweizer, E.Hoffmann-Roeder, A.Olsen, J.A.Seiler, P.Obst-Sander, U.Wagner, B.Kansy, M.Banner, D.W.Diederich, F.

(2006) Org Biomol Chem 4: 2364

  • DOI: 10.1039/b602585d
  • Primary Citation of Related Structures:  
    2CF9, 2CF8

  • PubMed Abstract: 
  • Two series of tricyclic inhibitors of the serine protease thrombin, imides (+/-)-1-(+/-)-8 and lactams (+/-)-9-(+/-)-13, were analysed to evaluate contributions of orthogonal multipolar interactions with the backbone C=O moiety of Asn98 to the free enthalpy of protein-ligand complexation ...

    Two series of tricyclic inhibitors of the serine protease thrombin, imides (+/-)-1-(+/-)-8 and lactams (+/-)-9-(+/-)-13, were analysed to evaluate contributions of orthogonal multipolar interactions with the backbone C=O moiety of Asn98 to the free enthalpy of protein-ligand complexation. The lactam derivatives are much more potent and more selective inhibitors (K(i) values between 0.065 and 0.005 microM, selectivity for thrombin over trypsin between 361- and 1609-fold) than the imide compounds (Ki values between 0.057 and 23.7 microM, selectivity for thrombin over trypsin between 3- and 67-fold). The increase in potency and selectivity is explained by the favorable occupancy of the P-pocket of thrombin by the additional isopropyl substituent in the lactam derivatives. The nature of the substituent on the benzyl ring filling the D pocket strongly influences binding potency in the imide series, with Ki values increasing in the sequence: F < OCH2O < Cl < H < OMe < OH < N(pyr)< Br. This sequence can be explained by both steric fit and the occurrence of orthogonal multipolar interactions with the backbone C[double bond, length as m-dash]O moiety of Asn98. In contrast, the substituent on the benzyl ring hardly affects the ligand potency in the lactam series. This discrepancy was clarified by the comparison of X-ray structures solved for co-crystals of thrombin with imide and lactam ligands. Whereas the benzyl substituents in the imide inhibitors are sufficiently close (< or =3.5 Angstroms) to the C=O group of Asn98 to allow for attractive orthogonal multipolar interactions, the distances in the lactam series are too large (> or =4 Angstroms) for attractive dipolar contacts to be effective.


    Organizational Affiliation

    Laboratorium für Organische Chemie, ETH-Zürich, Hönggerberg HCI, Switzerland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
THROMBIN HEAVY CHAIN H257Homo sapiensMutation(s): 0 
Gene Names: F2
EC: 3.4.21.5
Find proteins for P00734 (Homo sapiens)
Explore P00734 
Go to UniProtKB:  P00734
NIH Common Fund Data Resources
PHAROS:  P00734
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
HIRUDIN IIIA I11Hirudo medicinalisMutation(s): 0 
Find proteins for P28508 (Hirudo medicinalis)
Explore P28508 
Go to UniProtKB:  P28508
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
THROMBIN LIGHT CHAIN L28Homo sapiensMutation(s): 0 
Gene Names: F2
EC: 3.4.21.5
Find proteins for P00734 (Homo sapiens)
Explore P00734 
Go to UniProtKB:  P00734
NIH Common Fund Data Resources
PHAROS:  P00734
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
348
Query on 348

Download Ideal Coordinates CCD File 
H
4-[(1R,3AS,4R,8AS,8BR)-1-ISOPROPYL-2-(4-METHOXYBENZYL)-3-OXODECAHYDROPYRROLO[3,4-A]PYRROLIZIN-4-YL]BENZENECARBOXIMIDAMIDE
C27 H34 N4 O2
XETNTDPUFDNJKX-BDUWWWMKSA-N
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
H
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download Ideal Coordinates CCD File 
H
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
348Ki :  15   nM  PDBBind
348Ki:  15   nM  Binding MOAD
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.79 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.162 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.29α = 90
b = 71.84β = 100.56
c = 73.06γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-06-14
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
  • Version 1.2: 2012-11-30
    Changes: Other
  • Version 1.3: 2013-08-07
    Changes: Derived calculations, Other
  • Version 1.4: 2013-10-23
    Changes: Other
  • Version 1.5: 2017-03-29
    Changes: Structure summary
  • Version 1.6: 2017-07-05
    Changes: Data collection