3FIB: Recombinant Human Gamma-fibrinogen Carboxyl Terminal Fragment (residues 143-411) Bound To Calcium At Ph 6.0: A Further Refinement Of Pdb Entry 1fib, And Differs From 1fib By The Modelling Of A Cis Peptide Bond Between Residues K338 And C339

After vascular injury, a cascade of serine protease activations leads to the conversion of the soluble fibrinogen molecule into fibrin. The fibrin monomers then polymerize spontaneously and noncovalently to form a fibrin gel. The primary interaction of this polymerization reaction is between the newly exposed N-terminal Gly-Pro-Arg sequence of the alpha chain of one fibrin molecule and the C-terminal region of a gamma chain of an adjacent fibrin(ogen) molecule. In this report, the polymerization pocket has been identified by determining the crystal structure of a 30-kDa C-terminal fragment of the fibrin(ogen) gamma chain complexed with the peptide Gly-Pro-Arg-Pro. This peptide mimics the N terminus of the alpha chain of fibrin. The conformational change in the protein upon binding the peptide is subtle, with electrostatic interactions primarily mediating the association. This is consistent with biophysical experiments carried out over the last 50 years on this fundamental polymerization reaction.
PDB ID: 3FIBDownload
MMDB ID: 58310
PDB Deposition Date: 1997/7/14
Updated in MMDB: 2007/10
Experimental Method:
x-ray diffraction
Resolution: 2.1  Å
Source Organism:
Similar Structures:
Biological Unit for 3FIB: monomeric; determined by author
Molecular Components in 3FIB
Label Count Molecule
Protein (1 molecule)
Fibrinogen Gamma Chain Residues(Gene symbol: FGG)
Molecule annotation
Chemical (1 molecule)
* Click molecule labels to explore molecular sequence information.

Citing MMDB