Regulation of myotubularin-related (MTMR)2 phosphatidylinositol phosphatase by MTMR5, a catalytically inactive phosphatase.

Abstract	The myotubularin (MTM) family constitutes one of the most highly conserved protein-tyrosine phosphatase subfamilies in eukaryotes. MTM1, the archetypal member of this family, is mutated in X-linked myotubular myopathy, whereas mutations in the MTM-related (MTMR)2 gene cause the type 4B1 Charcot-Marie-Tooth disease, a severe hereditary motor and sensory neuropathy. In this study, we identified a protein that specifically interacts with MTMR2 but not MTM1. The interacting protein was shown by mass spectrometry to be MTMR5, a catalytically inactive member of the MTM family. We also demonstrate that MTMR2 interacts with MTMR5 via its coiled-coil domain and that mutations in the coiled-coil domain of either MTMR2 or MTMR5 abrogate this interaction. Through this interaction, MTMR5 increases the enzymatic activity of MTMR2 and dictates its subcellular localization. This article demonstrates an active MTM member being regulated by an inactive family member.
Authors	Soo-A Kim, Panayiotis O Vacratsis, Ron Firestein, Michael L Cleary, Jack E Dixon
Journal	Proceedings of the National Academy of Sciences of the United States of America (Proc Natl Acad Sci U S A) Vol. 100 Issue 8 Pg. 4492-7 (Apr 15 2003) ISSN: 0027-8424 [Print] United States
PMID	12668758 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)
Chemical References	Carrier Proteins Intracellular Signaling Peptides and Proteins Recombinant Fusion Proteins SBF1 protein, human MTMR2 protein, human Protein Tyrosine Phosphatases Protein Tyrosine Phosphatases, Non-Receptor myotubularin
Topics	Amino Acid Sequence Animals Binding Sites COS Cells Carrier Proteins (chemistry, genetics, metabolism) Cell Line Dimerization Humans In Vitro Techniques Intracellular Signaling Peptides and Proteins Molecular Sequence Data Protein Structure, Tertiary Protein Tyrosine Phosphatases (chemistry, genetics, metabolism) Protein Tyrosine Phosphatases, Non-Receptor Recombinant Fusion Proteins (chemistry, genetics, metabolism) Repetitive Sequences, Amino Acid Sequence Homology, Amino Acid Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization

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