1deq
From Proteopedia
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| , resolution 3.5Å | |||||||
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| Ligands: | |||||||
| Related: | 1FZA
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
THE CRYSTAL STRUCTURE OF MODIFIED BOVINE FIBRINOGEN (AT ~4 ANGSTROM RESOLUTION)
Overview
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.
About this Structure
1DEQ is a Protein complex structure of sequences from Bos taurus. Full crystallographic information is available from OCA.
Reference
The crystal structure of modified bovine fibrinogen., Brown JH, Volkmann N, Jun G, Henschen-Edman AH, Cohen C, Proc Natl Acad Sci U S A. 2000 Jan 4;97(1):85-90. PMID:10618375
Page seeded by OCA on Sun Mar 30 19:40:13 2008
