@article{1fdfdab9d97146878dd62b93f6b98110,
title = "Ozz-E3, a muscle-specific ubiquitin ligase, regulates β-catenin degradation during myogenesis",
abstract = "The identities of the ubiquitin-ligases active during myogenesis are largely unknown. Here we describe a RING-type E3 ligase complex specified by the adaptor protein, Ozz, a novel SOCS protein that is developmentally regulated and expressed exclusively in striated muscle. In mice, the absence of Ozz results in overt maturation defects of the sarcomeric apparatus. We identified β-catenin as one of the target substrates of the Ozz-E3 in vivo. In the differentiating myofibers, Ozz-E3 regulates the levels of sarcolemma-associated β-catenin by mediating its degradation via the proteasome. Expression of β-catenin mutants that reduce the binding of Ozz to endogenous β-catenin leads to Mb-β-catenin accumulation and myofibrillogenesis defects similar to those observed in Ozz null myocytes. These findings reveal a novel mechanism of regulation of Mb-β-catenin and the role of this pool of the protein in myofibrillogenesis, and implicate the Ozz-E3 ligase in the process of myofiber differentiation.",
author = "Tommaso Nastasi and Antonella Bongiovanni and Yvan Campos and Linda Mann and Toy, {James N.} and Jake Bostrom and Robbert Rottier and Christopher Hahn and Conaway, {Joan Weliky} and Harris, {A. John} and Alessandra d'Azzo",
note = "Funding Information: We are indebted to Gerard Grosveld for his crucial suggestions and discussions; Charles Sherr, Brenda Schulman and Guillermo Oliver for critical reading of the manuscript and helpful comments; Brenda Schulman for sharing some of the ubiquitination reagents; Stephanie Newton for performing the two-hybrid yeast screening; Latham Fink for his assistance in generating the β-catenin mutants; Erik Bonten for his assistance with the insect cells and purification procedures; Jacqueline Bonten for maintaining the myoblast cultures; Ann Marie Hamilton-Easton and Richard Cross for performing FACS analyses; Ken Barnes and Kuruganti Murti for their assistance with the confocal analyses; and Charlette Hill and Angela McArthur for editing the manuscript. A.J.H. was supported by grants from the New Zealand Lottery Board and Foundation for Research Science & Technology (FRST). A.d'A. holds an Endowed Chair in Genetics and Gene Therapy from the Jewelers Charity Fund. These studies were supported in part by the National Institute of Health grant DK52025, the Cancer Center Support grant CA21765, Phillip and Elizabeth Gross, and the American Lebanese Syrian Associated Charities (ALSAC). ",
year = "2004",
month = feb,
doi = "10.1016/S1534-5807(04)00020-6",
language = "English (US)",
volume = "6",
pages = "269--282",
journal = "Developmental cell",
issn = "1534-5807",
publisher = "Cell Press",
number = "2",
}