Shiraishi S, Tamamura N, Jogo M, Tanaka Y, Tamura TA. Rapid proteasomal degradation of transcription factor IIB in accordance with F9 cell differentiation.
Gene 2009;
436:115-20. [PMID:
19393171 DOI:
10.1016/j.gene.2009.01.016]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2007] [Revised: 12/15/2008] [Accepted: 01/25/2009] [Indexed: 11/28/2022]
Abstract
We found that the levels of all general transcription factors (GTFs) for RNA polymerase II decreased in F9 cells when the cells were subjected to a differentiation procedure. Different from other GTFs, decrease of TFIIB during the differentiation was suppressed by addition of a proteasome inhibitor, MG132. The half-life of TFIIB in the differentiated cells was remarkably reduced compared with that in the undifferentiated cells. Moreover, it was demonstrated that TFIIB is a poly-ubiquitinated protein. Results of this study suggest that components of the transcription machinery decreased in accordance with cell differentiation and that TFIIB is specifically and rapidly degraded by the ubiquitin-proteasome pathway.
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