The myotubularin family: from genetic disease to phosphoinositide metabolism.
The myotubularin-related genes define a large family of eukaryotic proteins, most of them initially characterized by the presence of a ten-amino acid consensus sequence related to the active sites of tyrosine phosphatases, dual-specificity protein phosphatases and the lipid phosphatase PTEN. Myotubularin (hMTM1), the founder member, is mutated in myotubular myopathy, and a close homolog (hMTMR2) was recently found mutated in a recessive form of Charcot-Marie-Tooth neuropathy. Although myotubularin was thought to be a dual-specificity protein phosphatase, recent results indicate that it is primarily a lipid phosphatase, acting on phosphatidylinositol 3-monophosphate, and might be involved in the regulation of phosphatidylinositol 3-kinase (PI 3-kinase) pathway and membrane trafficking.
Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, 1 rue Laurent Fries, BP163, 67404 Illkirch Cedex, C.U. de, Strasbourg, France.
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Laporte
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Blondeau
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Buj-Bello
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JL
Mandel
D000595:Amino Acid Sequence; D000818:Animals; D017124:Conserved Sequence; D019143:Evolution, Molecular; D006801:Humans; D008969:Molecular Sequence Data; D009154:Mutation; D020914:Myopathies, Structural, Congenital / Q000235:genetics*; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D010716:Phosphatidylinositols / Q000378:metabolism*; D010802:Phylogeny; D017434:Protein Structure, Tertiary; D017027:Protein Tyrosine Phosphatases / Q000235:genetics* / Q000378:metabolism; D054558:Protein Tyrosine Phosphatases, Non-Receptor
D010716:Phosphatidylinositols; D019869:Phosphatidylinositol 3-Kinases; D017027:Protein Tyrosine Phosphatases; D054558:Protein Tyrosine Phosphatases, Non-Receptor; C099588:myotubularin