1K1P

BOVINE TRYPSIN-INHIBITOR COMPLEX

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.170 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 

Literature

Factorising ligand affinity: a combined thermodynamic and crystallographic study of trypsin and thrombin inhibition.

Dullweber, F., Stubbs, M.T., Musil, D., Sturzebecher, J., Klebe, G.

(2001) J.Mol.Biol. 313: 593-614

  • DOI: 10.1006/jmbi.2001.5062
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • The binding of a series of low molecular weight ligands towards trypsin and thrombin has been studied by isothermal titration calorimetry and protein crystallography. In a series of congeneric ligands, surprising changes of protonation states occur a ...

    The binding of a series of low molecular weight ligands towards trypsin and thrombin has been studied by isothermal titration calorimetry and protein crystallography. In a series of congeneric ligands, surprising changes of protonation states occur and are overlaid on the binding process. They result from induced pK(a) shifts depending on the local environment experienced by the ligand and protein functional groups in the complex (induced dielectric fit). They involve additional heat effects that must be corrected before any conclusion on the binding enthalpy (DeltaH) and entropy (DeltaS) can be drawn. After correction, trends in both contributions can be interpreted in structural terms with respect to the hydrogen bond inventory or residual ligand motions. For all inhibitors studied, a strong negative heat capacity change (DeltaC(p)) is detected, thus binding becomes more exothermic and entropically less favourable with increasing temperature. Due to a mutual compensation, Gibbs free energy remains virtually unchanged. The strong negative DeltaC(p) value cannot solely be explained by the removal of hydrophobic surface portions of the protein or ligand from water exposure. Additional contributions must be considered, presumably arising from modulations of the local water structure, changes in vibrational modes or other ordering parameters. For thrombin, smaller negative DeltaC(p) values are observed for ligand binding in the presence of sodium ions compared to the other alkali ions, probably due to stabilising effects on the protein or changes in the bound water structure.

    Related Citations: 
    • Crystal Structures of Factor Xa Specific Inhibitors in Complex with Trypsin: Structural Grounds for Inhibition of Factor Xa and Selectivity Against Thrombin
      Stubbs, M.T.,Huber, R.,Bode, W.
      (1995) FEBS Lett. 375: 103
    • A Player of Many Parts: The Spotlight Falls on Thrombin'S Structure
      Stubbs, M.T.,Bode, W.
      (1993) Thromb.Res. 69: 1
    • Structural and Functional Analyses of Benzamidine-Based Inhibitors in Complex with Trypsin: Implications for the Inhibition of Factor Xa, Tpa, and Urokinase
      Renatus, M.,Bode, W.,Huber, R.,Stuerzebecher, J.,Stubbs, M.T.
      (1998) J.Med.Chem. 41: 5445

    Organizational Affiliation: 

    Philipps-Universität Marburg, Institut für Pharmazeutische Chemie, Marbacher Weg 6, D-35037 Marburg (Lahn), Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRYPSIN
A
223Bos taurusMutation(s): 0 
EC: 3.4.21.4
Find proteins for P00760 (Bos taurus)
Go to UniProtKB:  P00760
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA
Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MEL
Query on MEL
Download SDF File 
Download CCD File 
A
[((1R)-2-{(2S)-2-[({4-[AMINO(IMINO)METHYL]BENZYL}AMINO)CARBONYL]AZETIDINYL}-1-CYCLOHEXYL-2-OXOETHYL)AMINO]ACETIC ACID
MELAGATRAN (ASTRA-ZENECA)
C22 H31 N5 O4
DKWNMCUOEDMMIN-PKOBYXMFSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
MELIC50: 11 nM (100) BINDINGDB
MELIC50: 11.9 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.170 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 55.632α = 90.00
b = 55.632β = 90.00
c = 110.222γ = 120.00
Software Package:
Software NamePurpose
X-PLORrefinement
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2001-09-25 
  • Released Date: 2001-11-28 
  • Deposition Author(s): Stubbs, M.T.

Revision History 

  • Version 1.0: 2001-11-28
    Type: Initial release
  • Version 1.1: 2007-10-16
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance