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3bn3

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3bn3, resolution 2.10Å ()
Ligands: , ,
Gene: ITGAL, CD11A (Homo sapiens), ICAM5, TLCN, TLN (Homo sapiens)
Resources: FirstGlance, OCA, PDBsum, RCSB
Coordinates: save as pdb, mmCIF, xml



Contents

crystal structure of ICAM-5 in complex with aL I domain

Publication Abstract from PubMed

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.

An unusual allosteric mobility of the C-terminal helix of a high-affinity alphaL integrin I domain variant bound to ICAM-5., Zhang H, Casasnovas JM, Jin M, Liu JH, Gahmberg CG, Springer TA, Wang JH, Mol Cell. 2008 Aug 8;31(3):432-7. PMID:18691975

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

About this Structure

3bn3 is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA.

See Also

Reference

  • Zhang H, Casasnovas JM, Jin M, Liu JH, Gahmberg CG, Springer TA, Wang JH. An unusual allosteric mobility of the C-terminal helix of a high-affinity alphaL integrin I domain variant bound to ICAM-5. Mol Cell. 2008 Aug 8;31(3):432-7. PMID:18691975 doi:10.1016/j.molcel.2008.06.022

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