2ANT

THE 2.6 A STRUCTURE OF ANTITHROMBIN INDICATES A CONFORMATIONAL CHANGE AT THE HEPARIN BINDING SITE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The 2.6 A structure of antithrombin indicates a conformational change at the heparin binding site.

Skinner, R.Abrahams, J.P.Whisstock, J.C.Lesk, A.M.Carrell, R.W.Wardell, M.R.

(1997) J.Mol.Biol. 266: 601-609

  • DOI: 10.1006/jmbi.1996.0798

  • PubMed Abstract: 
  • The crystal structure of a dimeric form of intact antithrombin has been solved to 2.6 A, representing the highest-resolution structure of an active, inhibitory serpin to date. The crystals were grown under microgravity conditions on Space Shuttle mis ...

    The crystal structure of a dimeric form of intact antithrombin has been solved to 2.6 A, representing the highest-resolution structure of an active, inhibitory serpin to date. The crystals were grown under microgravity conditions on Space Shuttle mission STS-67. The overall confidence in the structure, determined earlier from lower resolution data, is increased and new insights into the structure-function relationship are gained. Clear and continuous electron density is present for the reactive centre loop region P12 to P14 inserting into the top of the A-beta-sheet. Areas of the extended amino terminus, unique to antithrombin and important in the binding of the glycosaminoglycan heparin, can now be traced further than in the earlier structures. As in the earlier studies, the crystals contain one active and one latent molecule per asymmetric unit. Better definition of the electron density surrounding the D-helix and of the residues implicated in the binding of the heparin pentasaccharide (Arg47, Lys114, Lys125, Arg129) provides an insight into the change of affinity of binding that accompanies the change in conformation. In particular, the observed hydrogen bonding of these residues to the body of the molecule in the latent form explains the mechanism for the release of newly formed antithrombin-protease complexes into the circulation for catabolic removal.


    Related Citations: 
    • Improved Diffraction of Antithrombin Crystals Grown in Microgravity
      Wardell, M.R.,Skinner, R.,Carter, D.C.,Twigg, P.D.,Abrahams, J.-P.
      () TO BE PUBLISHED --: --


    Organizational Affiliation

    Department of Haematology, University of Cambridge, MRC Centre, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ANTITHROMBIN
L, I
432Homo sapiensMutation(s): 0 
Gene Names: SERPINC1 (AT3)
Find proteins for P01008 (Homo sapiens)
Go to Gene View: SERPINC1
Go to UniProtKB:  P01008
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAA
Query on NAA

Download SDF File 
Download CCD File 
I, L
N-ACETYL-D-ALLOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-UIAUGNHASA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.217 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 61.410α = 90.00
b = 98.310β = 103.32
c = 90.410γ = 90.00
Software Package:
Software NamePurpose
TNTrefinement
AMoREphasing
MOSFLMdata reduction
CCP4data scaling
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-06-16
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance