2H0K image
Entry Detail
PDB ID:
2H0K
Keywords:
Title:
Crystal Structure of a Mutant of Rat Annexin A5
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2006-05-15
Release Date:
2007-06-19
Method Details:
Experimental Method:
Resolution:
2.76 Å
R-Value Free:
0.26
R-Value Work:
0.19
R-Value Observed:
0.20
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Annexin A5
Mutations:YES
Chain IDs:A, B
Chain Length:318
Number of Molecules:2
Biological Source:Rattus norvegicus
Ligand Molecules
Primary Citation
Annexin-A5 assembled into two-dimensional arrays promotes cell membrane repair.
Nat Commun 2 270 270 (2011)
PMID: 21468022 DOI: 10.1038/ncomms1270

Abstact

Eukaryotic cells possess a universal repair machinery that ensures rapid resealing of plasma membrane disruptions. Before resealing, the torn membrane is submitted to considerable tension, which functions to expand the disruption. Here we show that annexin-A5 (AnxA5), a protein that self-assembles into two-dimensional (2D) arrays on membranes upon Ca(2+) activation, promotes membrane repair. Compared with wild-type mouse perivascular cells, AnxA5-null cells exhibit a severe membrane repair defect. Membrane repair in AnxA5-null cells is rescued by addition of AnxA5, which binds exclusively to disrupted membrane areas. In contrast, an AnxA5 mutant that lacks the ability of forming 2D arrays is unable to promote membrane repair. We propose that AnxA5 participates in a previously unrecognized step of the membrane repair process: triggered by the local influx of Ca(2+), AnxA5 proteins bind to torn membrane edges and form a 2D array, which prevents wound expansion and promotes membrane resealing.

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Primary Citation of related structures