Implication of phosphoinositide phosphatases in genetic diseases: the case of myotubularin.
Phosphoinositides play a central role in the control of major eukaryotic cell signaling mechanisms. Accordingly, the list of phosphoinositide-metabolizing enzymes implicated in human diseases has considerably increased these last years. Here we will focus on myotubularin, the protein mutated in the X-linked myotubular myopathy (XLMTM) and the founding member of a family of 13 related proteins. Recent data demonstrate that myotubularin and several other members of the family are potent lipid phosphatases showing a marked specificity for phosphatidylinositol 3-phosphate [PtdIns(3)P]. This finding has raised considerable interest as PtdIns(3)P is implicated in vesicular trafficking and sorting through its binding to specific protein domains. The structure of myotubularin, the molecular mechanisms of its function and its implication in the etiology of XLMTM will be discussed, as well as the potential function and role of the other members of the family.
Tronchère
H
H
Inserm U563, Centre de Physiopathology de Toulouse Purpan, Département d'oncogenèse et transduction du signal dans les cellules hématopoïetiques, Hôpital Purpan, 31059 Toulouse, France. helentro@toulouse.inserm.fr
Buj-Bello
A
A
Mandel
J-L
JL
Payrastre
B
B
D000818:Animals; D022162:Cytoplasmic Vesicles / Q000378:metabolism; D004195:Disease Models, Animal; D051379:Mice; D018345:Mice, Knockout; D020914:Myopathies, Structural, Congenital / Q000201:enzymology* / Q000235:genetics / Q000503:physiopathology; D010716:Phosphatidylinositols / Q000378:metabolism*; D017027:Protein Tyrosine Phosphatases / Q000235:genetics / Q000378:metabolism*; D054558:Protein Tyrosine Phosphatases, Non-Receptor
D010716:Phosphatidylinositols; D017027:Protein Tyrosine Phosphatases; D054558:Protein Tyrosine Phosphatases, Non-Receptor; C099588:myotubularin