1SKZ

PROTEASE INHIBITOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

X-ray structure of antistasin at 1.9 A resolution and its modelled complex with blood coagulation factor Xa.

Lapatto, R.Krengel, U.Schreuder, H.A.Arkema, A.de Boer, B.Kalk, K.H.Hol, W.G.Grootenhuis, P.D.Mulders, J.W.Dijkema, R.Theunissen, H.J.Dijkstra, B.W.

(1997) EMBO J. 16: 5151-5161

  • DOI: 10.1093/emboj/16.17.5151

  • PubMed Abstract: 
  • The three-dimensional structure of antistasin, a potent inhibitor of blood coagulation factor Xa, from the Mexican leech Haementeria officinalis was determined at 1.9 A resolution by X-ray crystallography. The structure reveals a novel protein fold c ...

    The three-dimensional structure of antistasin, a potent inhibitor of blood coagulation factor Xa, from the Mexican leech Haementeria officinalis was determined at 1.9 A resolution by X-ray crystallography. The structure reveals a novel protein fold composed of two homologous domains, each resembling the structure of hirustasin, a related 55-residue protease inhibitor. However, hirustasin has a different overall shape than the individual antistasin domains, it contains four rather than two beta-strands, and does not inhibit factor Xa. The two antistasin domains can be subdivided into two similarly sized subdomains with different relative orientations. Consequently, the domain shapes are different, the N-terminal domain being wedge-shaped and the C-terminal domain flat. Docking studies suggest that differences in domain shape enable the N-terminal, but not C-terminal, domain of antistasin to bind and inhibit factor Xa, even though both have a very similar reactive site. Furthermore, a putative exosite binding region could be defined in the N-terminal domain of antistasin, comprising residues 15-17, which is likely to interact with a cluster of positively charged residues on the factor Xa surface (Arg222/Lys223/Lys224). This exosite binding region explains the specificity and inhibitory potency of antistasin towards factor Xa. In the C-terminal domain of antistasin, these exosite interactions are prevented due to the different overall shape of this domain.


    Related Citations: 
    • Crystallization and Preliminary Crystallographic Analysis of Antistasin, a Leech-Derived Inhibitor of Blood Coagulation Factor Xa
      Schreuder, H.,Arkema, A.,De Boer, B.,Kalk, K.,Dijkema, R.,Mulders, J.,Theunissen, H.,Hol, W.
      (1993) J.Mol.Biol. 231: 1137
    • Refined X-Ray Structure of Antistasin at 1.9 A Resolution
      Krengel, U.,Lapatto, R.,Dijkstra, B.W.
      (1996) Hasylab Jahresbericht --: 331


    Organizational Affiliation

    Laboratory of Biophysical Chemistry and BIOSON Research Institute, Department of Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ANTISTASIN
A
119Haementeria officinalisN/A
Find proteins for P15358 (Haementeria officinalis)
Go to UniProtKB:  P15358
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.217 
  • Space Group: I 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 76.500α = 90.00
b = 76.500β = 90.00
c = 86.600γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
X-PLORmodel building
XSCALEdata scaling
X-PLORphasing
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-10-22
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance