PMID: 18691975 , Related PDB id: 3BN3

Authors:

Zhang H, Casasnovas JM, Jin M, Liu JH, Gahmberg CG, Springer TA, Wang JH

Title:

An unusual allosteric mobility of the C-terminal helix of a high-affinity alphaL integrin I domain variant bound to ICAM-5.

Journal:

Mol Cell. 2008 Aug 8;31(3):432-7.

Abstract:

Integrins are cell surface receptors that transduce signals bidirectionally across the plasma membrane. The key event of integrin signaling is the allosteric regulation between its ligand-binding site and the C-terminal helix (alpha7) of integrin's inserted (I) domain. A significant axial movement of the alpha7 helix is associated with the open, active conformation of integrins. We describe the crystal structure of an engineered high-affinity I domain from the integrin alpha(L)beta(2) (LFA-1) alpha subunit in complex with the N-terminal two domains of ICAM-5, an adhesion molecule expressed in telencephalic neurons. The finding that the alpha7 helix swings out and inserts into a neighboring I domain in an upside-down orientation in the crystals implies an intrinsically unusual mobility of this helix. This remarkable feature allows the alpha7 helix to trigger integrin's large-scale conformational changes with little energy penalty. It serves as a mechanistic example of how a weakly bound adhesion molecule works in signaling.