1I8N

CRYSTAL STRUCTURE OF LEECH ANTI-PLATELET PROTEIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The structure of leech anti-platelet protein, an inhibitor of haemostasis.

Huizinga, E.G.Schouten, A.Connolly, T.M.Kroon, J.Sixma, J.J.Gros, P.

(2001) Acta Crystallogr.,Sect.D 57: 1071-1078


  • PubMed Abstract: 
  • Leech anti-platelet protein (LAPP) from the leech Haementeria officinalis is a collagen-binding protein that inhibits the collagen-mediated adhesion of blood platelets. The crystal structure of recombinant LAPP has been determined using single isomor ...

    Leech anti-platelet protein (LAPP) from the leech Haementeria officinalis is a collagen-binding protein that inhibits the collagen-mediated adhesion of blood platelets. The crystal structure of recombinant LAPP has been determined using single isomorphous replacement with anomalous scattering combined with solvent flattening and threefold molecular averaging. The model of LAPP has been refined to 2.2 A resolution (R factor 21.5%; free R factor 24.0%). LAPP contains an 89-residue C-terminal domain consisting of a central six-stranded antiparallel beta-sheet flanked on one side by an alpha-helix and on the other side by two extended loops with little secondary structure. A 36-residue N-terminal region is not visible in the electron-density map. This region is rich in glycine and lacks hydrophobic residues. It probably does not have a compact globular fold, but instead has an extended conformation and is flexible. The crystal packing suggests that LAPP may form tightly interacting dimers. The fold of the C-terminal domain of LAPP closely resembles that of the N-domain of hepatocyte growth factor (HGF), which classifies LAPP as a PAN domain. However, no significant sequence homology exists between LAPP and other PAN domains. Common structural features between LAPP and the HGF N-domain include two disulfide bonds that link the alpha-helix to the central region of the protein and five residues with a conserved hydrophobic nature that are located in the core of the domain. These conserved structural features may be an important determinant of the PAN-domain type of fold.


    Related Citations: 
    • An inhibitor of Collagen-Stimulated Platelet Activation from the salivary glands of the Haementeria Officinalis Leech. I. Identification, Isolation, and Characterization
      Connolly, T.M.,Jacobs, J.W.,Condra, C.
      (1992) J.Biol.Chem. 267: 6893
    • An inhibitor of Collagen-Stimulated Platelet Activation from the salivary glands of the Haementeria Officinalis Leech. II. Cloning of the cDNA and Expression
      Keller, P.M.,Schultz, L.D.,Condra, C.,Karczewski, J.,Connolly, T.M.
      (1992) J.Biol.Chem. 267: 6899


    Organizational Affiliation

    Thrombosis and Haemostasis Laboratory, Department of Haematology, Institute of Biomembranes, University Medical Center Utrecht, 3508 CH Utrecht, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ANTI-PLATELET PROTEIN
A, B, C
126Haementeria officinalisGene Names: LAPP
Find proteins for Q01747 (Haementeria officinalis)
Go to UniProtKB:  Q01747
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ROP
Query on ROP

Download SDF File 
Download CCD File 
A, B, C
PROPIONAMIDE
C3 H7 N O
QLNJFJADRCOGBJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.215 
  • Space Group: P 43 2 2
Unit Cell:
Length (Å)Angle (°)
a = 73.450α = 90.00
b = 73.450β = 90.00
c = 199.490γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
PHASESphasing
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-08-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance