The crystal structure of modified bovine fibrinogen.Brown, J.H., Volkmann, N., Jun, G., Henschen-Edman, A.H., Cohen, C.
(2000) Proc.Natl.Acad.Sci.USA 97: 85-90
- PubMed: 10618375
- PubMed Abstract:
- Crystalline States of a Modified Fibrinogen
Tooney, N.M.,Cohen, C.
(1977) J.Mol.Biol. 110: 363
- Crystals of Modified Fibrinogen: Size, Shape and Packing of Molecules
Weisel, J.W.,Warren, S.G.,Cohen, C.
(1978) J.Mol.Biol. 126: 159
- Fibrinogen Structure in Projection at 18 Angstroms Resolution
Rao, S.P.S.,Poojary, M.D.,Elliott Jr., B.W.,Melanson, L.A.,Oriel, B.,Cohen, C.
(1991) J.Mol.Biol. 222: 89
Here we report the crystal structure at approximately 4-A resolution of a selectively proteolyzed bovine fibrinogen. This key component in hemostasis is an elongated 340-kDa glycoprotein in the plasma that upon activation by thrombin self-assembles t ...
Here we report the crystal structure at approximately 4-A resolution of a selectively proteolyzed bovine fibrinogen. This key component in hemostasis is an elongated 340-kDa glycoprotein in the plasma that upon activation by thrombin self-assembles to form the fibrin clot. The crystals are unusual because they are made up of end-to-end bonded molecules that form flexible filaments. We have visualized the entire coiled-coil region of the molecule, which has a planar sigmoidal shape. The primary polymerization receptor pockets at the ends of the molecule face the same way throughout the end-to-end bonded filaments, and based on this conformation, we have developed an improved model of the two-stranded protofibril that is the basic building block in fibrin. Near the middle of the coiled-coil region, the plasmin-sensitive segment is a hinge about which the molecule adopts different conformations. This segment also includes the boundary between the three- and four-stranded portions of the coiled coil, indicating the location on the backbone that anchors the extended flexible Aalpha arm. We suggest that a flexible branch point in the molecule may help accommodate variability in the structure of the fibrin clot.
Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, MA 02454-9110, USA.