2J3S image
Deposition Date 2006-08-23
Release Date 2007-10-16
Last Version Date 2023-12-13
Entry Detail
PDB ID:
2J3S
Title:
Crystal structure of the human filamin A Ig domains 19 to 21
Biological Source:
Source Organism:
HOMO SAPIENS (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.50 Å
R-Value Free:
0.29
R-Value Work:
0.25
R-Value Observed:
0.25
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:FILAMIN-A
Gene (Uniprot):FLNA
Chain IDs:A, B
Chain Length:288
Number of Molecules:2
Biological Source:HOMO SAPIENS
Primary Citation
Structure of Three Tandem Filamin Domains Reveals Auto-Inhibition of Ligand-Binding.
Embo J. 26 3993 ? (2007)
PMID: 17690686 DOI: 10.1038/SJ.EMBOJ.7601827

Abstact

Human filamins are large actin-crosslinking proteins composed of an N-terminal actin-binding domain followed by 24 Ig-like domains (IgFLNs), which interact with numerous transmembrane receptors and cytosolic signaling proteins. Here we report the 2.5 A resolution structure of a three-domain fragment of human filamin A (IgFLNa19-21). The structure reveals an unexpected domain arrangement, with IgFLNa20 partially unfolded bringing IgFLNa21 into close proximity to IgFLNa19. Notably the N-terminus of IgFLNa20 forms a beta-strand that associates with the CD face of IgFLNa21 and occupies the binding site for integrin adhesion receptors. Disruption of this IgFLNa20-IgFLNa21 interaction enhances filamin binding to integrin beta-tails. Structural and functional analysis of other IgFLN domains suggests that auto-inhibition by adjacent IgFLN domains may be a general mechanism controlling filamin-ligand interactions. This can explain the increased integrin binding of filamin splice variants and provides a mechanism by which ligand binding might impact filamin structure.

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Primary Citation of related structures