期刊
CELL RESEARCH
卷 22, 期 5, 页码 873-885出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/cr.2012.38
关键词
ubiquitin E3 ligase; inhibition; growth regulation
类别
资金
- Ministry of Education, Science and Technology [20110028646, 20100018768]
- National R&D Program for Cancer Control
- Ministry of Health Welfare [0720070]
- Korea Foundation for Cancer Research of the Republic of Korea [KFCR-2009-002]
The serine/threonine kinase Akt functions in multiple cellular processes, including cell survival and tumor development. Studies of the mechanisms that negatively regulate Akt have focused on dephosphorylation-mediated inactivation. In this study, we identified a negative regulator of Akt, MULAN, which possesses both a RING finger domain and E3 ubiquitin ligase activity. Akt was found to directly interact with MULAN and to be ubiquitinated by MULAN in vitro and in vivo. Other molecular assays demonstrated that phosphorylated Akt is a substantive target for both interaction with MULAN and ubiquitination by MULAN. The results of the functional studies suggest that the degradation of Akt by MULAN suppresses cell proliferation and viability. These data provide insight into the Akt ubiquitination signaling network.
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