Molecule of the Month: Integrin
Integrins forge flexible linkages between the infrastructure inside and outside of cells
Structures by Parts
Exploring the Structure
Integrin Motion (PDB entries 3fcs and 2vdo)
Researchers have not been able to crystallize the entire extracellular portion in the open, active form, but they have studied a smaller fragment, which includes just the domains near the binding site. PDB entry 2vdo shows it in the open, active state, bound to a short peptide from fibrinogen. Click on the image to get an interactive Jmol image that allows you to compare the open and closed structures.
Topics for Further Discussion
- Researchers have studied the interaction of integrins with different molecules inside and outside cells. Can you find structures that show these interactions?
- The structure of a snake toxin that attacks integrin is available in PDB entry 1v7p. Why would blocking integrins make a snake toxin more effective?
Related PDB-101 Resources
- Browse Molecular Infrastructure
- S. J. Shattil, C. Kim and M. H. Ginsberg (2010) The final steps of integrin activation: the end game. Nature Reviews Cell and Molecular Biology 11, 288-300.
- M. A. Arnaout, S. L. Goodman and J.-P. Xiong (2007) Structure and mechanics of integrin-based cell adhesion. Current Opinion in Cell Biology 19, 495-507.
- B.-H. Luo, C. V. Carman and T. A. Springer (2007) Structural basis of integrin regulation and signaling. Annual Review of Immunology 25, 619-47.
- B.-H. Luo and T. A. Springer (2006) Integrin structures and conformational signaling. Current Opinion in Cell Biology 18, 579-586.
February 2011, David Goodsellhttp://doi.org/10.2210/rcsb_pdb/mom_2011_2