X-ray crystallographic studies on fibrinogen and fibrin

More than a dozen crystal structures of fibrinogen and fibrin fragments have been reported, including a structure of a native fibrinogen. The majority of the other structures are fragments D and D-dimer crystallized in the presence or absence of synthetic peptide ligands patterned on the A and B 'knobs'. Overall, fibrinogens or their fragments from four different species - human. bovine, chicken and lamprey - have been studied so far, with only minor differences in the structures being observed. Although these studies have thrown much light on the details of the fibrinogen to fibrin conversion, much remains to be found out.