EKLF/KLF1 is ubiquitinated in vivo and its stability is regulated by activation domain sequences through the 26S proteasome
- 24 March 2006
- journal article
- Published by Wiley in FEBS Letters
- Vol. 580 (9) , 2285-2293
- https://doi.org/10.1016/j.febslet.2006.03.039
Abstract
Erythroid Krüppel-like factor (EKLF/KLF1) is an erythroid specific, C 2 H 2 zinc finger transcription factor that is essential for the proper chromatin structure and expression of the adult β-globin gene. Herein, we determine that 26S proteasome inhibitors lead to an accumulation of EKLF protein in murine erythroleukemia (MEL) cells. In addition, EKLF half-life in both MEL cells (<3 h) and fetal liver cells (between 6 and 9 h) is stabilized in the presence of these inhibitors. EKLF is ubiquitinated in vivo, however its modification does not rely on a particular internal lysine. Finally, EKLF contains two PEST sequences within its N-terminus that have no effect on the ability of EKLF to be ubiquitinated but contribute to its destabilization. Keywords Ubiquitin Transcription factor Zinc finger protein PEST sequence Erythroid cellsKeywords
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