7xz1

Structural highlights

Function

TRI72_MOUSE Muscle-specific protein that plays a central role in cell membrane repair by nucleating the assembly of the repair machinery at injury sites. Specifically binds phosphatidylserine. Acts as a sensor of oxidation: upon membrane damage, entry of extracellular oxidative environment results in disulfide bond formation and homooligomerization at the injury site. This oligomerization acts as a nucleation site for recruitment of TRIM72-containing vesicles to the injury site, leading to membrane patch formation. Probably acts upstream of the Ca(2+)-dependent membrane resealing process. Required for transport of DYSF to sites of cell injury during repair patch formation. Regulates membrane budding and exocytosis. May be involved in the regulation of the mobility of KCNB1-containing endocytic vesicles.^{[1] [2] [3] [4]}

References

1. ↑ Cai C, Masumiya H, Weisleder N, Pan Z, Nishi M, Komazaki S, Takeshima H, Ma J. MG53 regulates membrane budding and exocytosis in muscle cells. J Biol Chem. 2009 Jan 30;284(5):3314-3322. PMID:19029292 doi:10.1074/jbc.M808866200
2. ↑ Cai C, Masumiya H, Weisleder N, Matsuda N, Nishi M, Hwang M, Ko JK, Lin P, Thornton A, Zhao X, Pan Z, Komazaki S, Brotto M, Takeshima H, Ma J. MG53 nucleates assembly of cell membrane repair machinery. Nat Cell Biol. 2009 Jan;11(1):56-64. PMID:19043407 doi:10.1038/ncb1812
3. ↑ Masumiya H, Asaumi Y, Nishi M, Minamisawa S, Adachi-Akahane S, Yoshida M, Kangawa K, Ito K, Kagaya Y, Yanagisawa T, Yamazaki T, Ma J, Takeshima H. Mitsugumin 53-mediated maintenance of K+ currents in cardiac myocytes. Channels (Austin). 2009 Jan-Feb;3(1):6-11. PMID:19202355 doi:10.4161/chan.3.1.7571
4. ↑ Cai C, Weisleder N, Ko JK, Komazaki S, Sunada Y, Nishi M, Takeshima H, Ma J. Membrane repair defects in muscular dystrophy are linked to altered interaction between MG53, caveolin-3, and dysferlin. J Biol Chem. 2009 Jun 5;284(23):15894-902. PMID:19380584 doi:10.1074/jbc.M109.009589