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- Title
The TRIM-FLMN protein TRIM45 directly interacts with RACK1 and negatively regulates PKC-mediated signaling pathway.
- Authors
Sato, T; Takahashi, H; Hatakeyama, S; Iguchi, A; Ariga, T
- Abstract
The receptor for activated C-kinase (RACK1), a scaffolding protein that participates in the protein kinase C (PKC) signaling pathway, has an important role in shuttling active PKCs to its substrate. Indeed, recent studies have revealed that RACK1 has an important role in tumorigenesis and that enhancement of the feed-forward mechanism of the c-Jun N-terminal kinase (JNK)-Jun pathway via RACK1 is associated with constitutive activation of MEK (MAPK-ERK kinase)-ERK (extracellular signal-regulated kinase) signaling in human melanoma cells. Taken together, RACK1 additionally has a very important role in the mitogen-activated protein kinase (MAPK) signaling pathway. Here, we show that one of the tripartite motif-containing (TRIM) family ubiquitin ligases, TRIM45, is a novel RACK1-interacting protein and downregulates MAPK signal transduction. Importantly, the expression of TRIM45 is induced when growth-promoting extracellular stimuli activate the MAPK signaling pathway, resulting in attenuation of activation of the MAPK pathway. These findings suggest that TRIM45 functions as a member of the negative feedback loop of the MAPK pathway.
- Subjects
TRIM proteins; PROTEIN kinase C regulation; TISSUE scaffolds; C-Jun N-terminal kinases; EXTRACELLULAR signal-regulated kinases; MITOGEN-activated protein kinases; NEOPLASTIC cell transformation
- Publication
Oncogene, 2015, Vol 34, Issue 10, p1280
- ISSN
0950-9232
- Publication type
Article
- DOI
10.1038/onc.2014.68