Nature Medicine
18, 331 - 337 (1998)
doi:10.1038/ng0498-331
Association of SET domain and myotubularin-related proteins modulates growth controlXiangmin Cui1, Immaculata De Vivo1, Robert Slany1, Alison Miyamoto1, Ron Firestein1
& Michael L. Cleary1
1Department of Pathology, Stanford University Medical Center, Stanford, California 94305, USA. e-mail: mcleary@cmgm.stanford.edu Several proteins that contribute to epigenetic mechanisms of gene regulation contain a characteristic motif of unknown function called the SET (Suvar3-9, Enhancer-of-zeste, Trithorax) domain. We have demonstrated that SET domains mediate highly conserved interactions with a specific family of proteins that display similarity with dual-specificity phosphatases (dsPTPases). These include myotubularin, the gene of which is mutated in a subset of patients with X-linked myotubular myopathy, and Sbf1, a newly isolated homologue of myotubularin. In contrast with myotubularin, Sbf 1 lacks a functional catalytic domain which dephosphorylates phospho-tyrosine and serine-containing peptides in vitro. Competitive interference of endogenous SET domain-dsPTPase interactions by forced expression of Sbf 1 induced oncogenic transformation of NIH 3T3 fibroblasts and impaired the in vitro differentiation of C2 myoblast cells. We conclude that myotubularin-type phosphatases link SET-domain containing components of the epigenetic regulatory machinery with signalling pathways involved in growth and differentiation.
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