Abstract:
:Fos-related antigen-1 (Fra-1) is a member of the Activator Protein-1 (AP-1) transcription factor superfamily that is overexpressed in a variety of cancers, including colon, breast, lung, bladder and brain. High Fra-1 levels are associated with enhanced cell proliferation, survival, migration and invasion. Despite its frequent overexpression, the molecular mechanisms that regulate the accumulation of Fra-1 proteins in tumour cells are not well understood. Here, we show that turnover of Fra-1, which does not require ubiquitylation, is cooperatively regulated by two distinct mechanisms-association with the 19S proteasomal subunit, TBP-1, and by a C-terminal degron, which acts independently of TBP-1, but is regulated by RAS-ERK (extracellular signal-regulated kinase) signalling. TBP-1 depletion stabilized Fra-1 and further increased its levels in tumour cells expressing RAS-ERK pathway oncogenes. These effects correlated with increased AP-1 transcriptional activity. We suggest that during Fra-1 degradation, association with TBP-1 provides a mechanism for ubiquitin-independent proteasomal recognition, while the C terminus of the protein regulates its subsequent proteolytic processing.
journal_name
Oncogenejournal_title
Oncogeneauthors
Pakay JL,Diesch J,Gilan O,Yip YY,Sayan E,Kolch W,Mariadason JM,Hannan RD,Tulchinsky E,Dhillon ASdoi
10.1038/onc.2011.375subject
Has Abstractpub_date
2012-04-05 00:00:00pages
1817-24issue
14eissn
0950-9232issn
1476-5594pii
onc2011375journal_volume
31pub_type
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