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The 26S proteasome system degrades the ERM transcription factor and regulates its transcription-enhancing activity.

Abstract：

:ERM is a member of the ETS transcription factor family. High levels of the corresponding mRNA are detected in a variety of human breast cancer cell lines, as well as in aggressive human breast tumors. As ERM protein is almost undetectable in these cells, high degradation of this transcription factor has been postulated. Here we have investigated whether ERM degradation might depend on the proteasome pathway. We show that endogenous and ectopically expressed ERM protein is short-lived protein and undergoes proteasome-dependent degradation. Deletion mutagenesis studies indicate that the 61 C-terminal amino acids of ERM are critical for its proteolysis and serve as a degradation signal. Although ERM conjugates with ubiquitin, this post-translational modification does not depend on the C-terminal domain. We have used an Ets-responsive ICAM-1 reporter plasmid to show that the ubiquitin-proteasome pathway can affect transcriptional function of ERM. Thus, ERM is subject to degradation via the 26S proteasome pathway, and this pathway probably plays an important role in regulating ERM transcriptional activity.

journal_name

Oncogene

journal_title

Oncogene

authors

Baert JL,Beaudoin C,Monte D,Degerny C,Mauen S,de Launoit Y

doi

10.1038/sj.onc.1209801

subject

Has Abstract

pub_date

2007-01-18 00:00:00

pages

415-24

issue

3

eissn

0950-9232

issn

1476-5594

pii

1209801

journal_volume

26

pub_type

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