1ZR0

Crystal Structure of Kunitz Domain 1 of Tissue Factor Pathway Inhibitor-2 with Bovine Trypsin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.231 

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This is version 1.2 of the entry. See complete history


Literature

Crystal structure of Kunitz domain 1 (KD1) of tissue factor pathway inhibitor-2 in complex with trypsin. Implications for KD1 specificity of inhibition

Schmidt, A.E.Chand, H.S.Cascio, D.Kisiel, W.Bajaj, S.P.

(2005) J Biol Chem 280: 27832-27838

  • DOI: 10.1074/jbc.M504105200
  • Primary Citation of Related Structures:  
    1ZR0

  • PubMed Abstract: 
  • Kunitz domain 1 (KD1) of tissue factor pathway inhibitor-2 inhibits trypsin, plasmin, and factor VIIa (FVIIa)/tissue factor with Ki values of 13, 3, and 1640 nM, respectively. To investigate the molecular specificity of KD1, crystals of the complex o ...

    Kunitz domain 1 (KD1) of tissue factor pathway inhibitor-2 inhibits trypsin, plasmin, and factor VIIa (FVIIa)/tissue factor with Ki values of 13, 3, and 1640 nM, respectively. To investigate the molecular specificity of KD1, crystals of the complex of KD1 with bovine beta-trypsin were obtained that diffracted to 1.8 A. The P1 residue Arg-15 (bovine pancreatic trypsin inhibitor numbering) in KD1 interacts with Asp-189 (chymotrypsin numbering) and with the carbonyl oxygens of Gly-219 and Ogamma of Ser-190. Leu-17, Leu-18, Leu-19, and Leu-34 in KD1 make van der Waals contacts with Tyr-39, Phe-41, and Tyr-151 in trypsin, forming a hydrophobic interface. Molecular modeling indicates that this complementary hydrophobic patch is composed of Phe-37, Met-39, and Phe-41 in plasmin, whereas in FVIIa/tissue factor, it is essentially absent. Arg-20, Tyr-46, and Glu-39 in KD1 interact with trypsin through ordered water molecules. In contrast, insertions in the 60-loop in plasmin and FVIIa allow Arg-20 of KD1 to directly interact with Glu-60 in plasmin and Asp-60 in FVIIa. Moreover, Tyr-46 in KD1 electrostatically interacts with Lys-60A and Arg-60D in plasmin and Lys-60A in FVIIa. Glu-39 in KD1 interacts directly with Arg-175 of the basic patch in plasmin, whereas in FVIIa, such interactions are not possible. Thus, the specificity of KD1 for plasmin is attributable to hydrophobic and direct electrostatic interactions. For trypsin, hydrophobic interactions are intact, and electrostatic interactions are weak, whereas for FVIIa, hydrophobic interactions are missing, and electrostatic interactions are partially intact. These findings provide insight into the protease selectivity of KD1.


    Organizational Affiliation

    UCLA/Orthopedic Hospital, Department of Orthopedic Surgery, University of California, Los Angeles, California 90095, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cationic trypsinAC223Bos taurusMutation(s): 0 
EC: 3.4.21.4
Find proteins for P00760 (Bos taurus)
Explore P00760 
Go to UniProtKB:  P00760
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Tissue factor pathway inhibitor 2BD63Homo sapiensMutation(s): 0 
Gene Names: TFPI2
Find proteins for P48307 (Homo sapiens)
Explore P48307 
Go to UniProtKB:  P48307
NIH Common Fund Data Resources
PHAROS  P48307
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

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A, C
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.295 
  • R-Value Work: 0.231 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.107α = 90
b = 77.013β = 90
c = 125.424γ = 90
Software Package:
Software NamePurpose
EPMRphasing
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-06-07
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance