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Title	en Rabring7 Degrades c-Myc through Complex Formation with MM-1
Creator	en Narita, Rina en Kitaura, Hirotake NRID 1000010281817 en Torii, Ayako en Tashiro, Erika en Miyazawa, Makoto en Ariga, Hiroyoshi NRID 1000020143505 en Iguchi-Ariga, Sanae M. M.
Accessrights	open access
Rights	http://creativecommons.org/licenses/by/3.0/ en Creative Commons Attribution 3.0 Unported
Subject	NDC 499
Description	Abstract en We have reported that a novel c-Myc-binding protein, MM-1, repressed E-box-dependent transcription and transforming activities of c-Myc and that a mutation of A157R in MM-1, which is often observed in patients with leukemia or lymphoma, abrogated all of the repressive activities of MM-1 toward c-Myc, indicating that MM-1 is a novel tumor suppressor. MM-1 also binds to the ubiquitin-proteasome system, leading to degradation of c-Myc. In this study, we identified Rabring7, a Rab7-binding and RING finger-containing protein, as an MM-1-binding protein, and we found that Rabring7 mono-ubiquitinated MM-1 in the cytoplasm without degradation of MM-1. Rabring7 was also found to bind to c-Myc and to ubiquitinate c-Myc in a threonine 58-dependent manner. When c-Myc was co-transfected with MM-1 and Rabring7, c-Myc was degraded. Furthermore, it was found that c-Myc was stabilized in MM-1-knockdown cells even when Rabring7 was transfected and that Rabring7 was bound to and co-localized with MM-1 and c-Myc after MM-1 and Rabring7 had been translocated from the cytoplasm to the nucleus. These results suggest that Rabring7 stimulates c-Myc degradation via mono-ubiquitination of MM-1.
Publisher	en Public Library of Science
Date	Issued2012-07-23
Language	eng
Resource Type	journal article
Version Type	VoR
Identifier	HDL http://hdl.handle.net/2115/50059
Relation	isIdenticalTo DOI https://doi.org/10.1371/journal.pone.0041891
Journal	PISSN 1932-6203 en PLoS One Volume Number7 Issue Number7 Page Starte41891
File	fulltext PLoO7-7_e41891.pdf 3.6 MB (application/pdf) Issued2012-07-23
Oaidate	2023-07-26