1Y5B

Dianhydrosugar-based benzamidine, factor Xa specific inhibitor in complex with bovine trypsin mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.160 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Understanding binding selectivity toward trypsin and factor Xa: the role of aromatic interactions

Di Fenza, A.Heine, A.Koert, U.Klebe, G.

(2007) ChemMedChem 2: 297-308

  • DOI: https://doi.org/10.1002/cmdc.200600185
  • Primary Citation of Related Structures:  
    1Y59, 1Y5A, 1Y5B, 1Y5U

  • PubMed Abstract: 

    A congeneric series of four bis-benzamidine inhibitors sharing a dianhydrosugar isosorbide scaffold in common has been studied by crystal structure analysis and enzyme kinetics with respect to their binding to trypsin and factor Xa. Within the series, aromatic interactions are an important determinant for selectivity discrimination among both serine proteases. To study the selectivity-determining features in detail, we used trypsin mutants in which the original binding site is gradually substituted to finally resemble the factor Xa binding pocket. The influence of these mutations has been analyzed on the binding of the closely related inhibitors. We present the crystal structures of the inhibitor complexes obtained by co-crystallizing an "intermediate" trypsin mutant. They could be determined to a resolution of up to 1.2 A, and we measured the inhibitory activity (K(i)) of each ligand against factor Xa, trypsin, and the various mutants. From these data we were able to derive a detailed structure-activity relationship which demonstrates the importance of aromatic interactions in protein-ligand recognition and their role in modulating enzyme selectivity. Pronounced preference is experienced to accommodate the benzamidine anchor with meta topology in the S(1) specificity pocket. One ligand possessing only para topology deviates strongly from the other members of the series and adopts a distinct binding mode addressing the S(1)' site instead of the distal S(3)/S(4) binding pocket.


  • Organizational Affiliation

    Institute of Pharmaceutical Chemistry, University of Marburg, Marbacher Weg 6, 35032 Marburg, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Trypsin, cationicA [auth T]223Bos taurusMutation(s): 2 
EC: 3.4.21.4
UniProt
Find proteins for P00760 (Bos taurus)
Explore P00760 
Go to UniProtKB:  P00760
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00760
Sequence Annotations
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.160 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.366α = 90
b = 54.366β = 90
c = 105.14γ = 120
Software Package:
Software NamePurpose
SHELXmodel building
SHELXL-97refinement
CrystalCleardata reduction
HKL-2000data scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-12-13
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2021-11-10
    Changes: Database references, Derived calculations