3DGV image
Deposition Date 2008-06-16
Release Date 2008-07-22
Last Version Date 2024-11-13
Entry Detail
PDB ID:
3DGV
Keywords:
Title:
Crystal structure of thrombin activatable fibrinolysis inhibitor (TAFI)
Biological Source:
Source Organism:
Bos taurus (Taxon ID: 9913)
Method Details:
Experimental Method:
Resolution:
2.50 Å
R-Value Free:
0.24
R-Value Work:
0.20
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Carboxypeptidase B2
Gene (Uniprot):CPB2
Chain IDs:A, B, C
Chain Length:401
Number of Molecules:3
Biological Source:Bos taurus
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
Primary Citation
The crystal structure of thrombin-activable fibrinolysis inhibitor (TAFI) provides the structural basis for its intrinsic activity and the short half-life of TAFIa.
J.Biol.Chem. 283 29416 29423 (2008)
PMID: 18669641 DOI: 10.1074/jbc.M804003200

Abstact

Mature thrombin-activable fibrinolysis inhibitor (TAFIa) is a highly unstable metallocarboxypeptidase that stabilizes blood clots by clipping C-terminal lysine residues from partially degraded fibrin. In accordance with its in vitro antifibrinolytic activity, animal studies have reported that inhibition of mature TAFI aids in the prevention of thrombosis. The level of TAFI activity is stringently regulated through (i) controlled proteolytic truncation of the zymogen (TAFI), generating the mature enzyme, TAFIa, and (ii) the short half-life of TAFIa. TAFI itself exhibits an intrinsic enzymatic activity, which is likely required to provide a baseline level of antifibrinolytic activity. The novel crystal structure presented here reveals that the active site of TAFI is accessible, providing the structural explanation for the its intrinsic activity. It also supports the notion that an "instability region" exists, in agreement with site-directed mutagenesis studies. Sulfate ions, bound to this region, point toward a potential heparin-binding site and could explain how heparin stabilizes TAFIa.

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