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ELK-1 ubiquitination status and transcriptional activity are modulated independently of F-Box protein FBXO25

Quintero-Barceinas, Reyna Sara; Gehringer, Franziska; Ducker, Charles; Saxton, Janice; Shaw, Peter E.

ELK-1 ubiquitination status and transcriptional activity are modulated independently of F-Box protein FBXO25 Thumbnail


Authors

Reyna Sara Quintero-Barceinas

Franziska Gehringer

Janice Saxton

Peter E. Shaw



Abstract

The mitogen-responsive, ETS-domain transcription factor ELK-1 stimulates the expression of immediate early genes at the onset of the cell cycle and participates in early developmental programming. ELK-1 is subject to multiple levels of posttranslational control, including phosphorylation, SUMOylation, and ubiquitination. Recently, removal of monoubiquitin from the ELK-1 ETS domain by the Ubiquitin Specific Protease USP17 was shown to augment ELK-1 transcriptional activity and promote cell proliferation. Here we have used coimmunoprecipitation experiments, protein turnover and ubiquitination assays, RNA-interference and gene expression analyses to examine the possibility that USP17 acts antagonistically with the F-box protein FBXO25, an E3 ubiquitin ligase previously shown to promote ELK-1 ubiquitination and degradation. Our data confirm that FBXO25 and ELK-1 interact in HEK293T cells and that FBXO25 is active toward Hand1 and HAX1, two of its other candidate substrates. However, our data indicate that FBXO25 neither promotes ubiquitination of ELK-1 nor impacts on its transcriptional activity and suggest that an E3 ubiquitin ligase other than FBXO25 regulates ELK-1 ubiquitination and function.

Citation

Quintero-Barceinas, R. S., Gehringer, F., Ducker, C., Saxton, J., & Shaw, P. E. (2021). ELK-1 ubiquitination status and transcriptional activity are modulated independently of F-Box protein FBXO25. Journal of Biological Chemistry, 296, Article 100214. https://doi.org/10.1074/jbc.ra120.014616

Journal Article Type Article
Acceptance Date Dec 11, 2020
Online Publication Date Jan 4, 2021
Publication Date 2021
Deposit Date Feb 4, 2021
Publicly Available Date Feb 4, 2021
Journal Journal of Biological Chemistry
Print ISSN 0021-9258
Electronic ISSN 1083-351X
Publisher American Society for Biochemistry and Molecular Biology
Peer Reviewed Peer Reviewed
Volume 296
Article Number 100214
DOI https://doi.org/10.1074/jbc.ra120.014616
Keywords gene regulation; ETS transcription factor family; ubiquitin ligase; cell proliferation; development; ubiquitin-specific protease 17 (USP17)
Public URL https://nottingham-repository.worktribe.com/output/5291909
Publisher URL https://www.sciencedirect.com/science/article/pii/S0021925820002100
Additional Information This article is maintained by: Elsevier; Article Title: ELK-1 ubiquitination status and transcriptional activity are modulated independently of F-Box protein FBXO25; Journal Title: Journal of Biological Chemistry; CrossRef DOI link to publisher maintained version: https://doi.org/10.1074/jbc.RA120.014616; Content Type: article; Copyright: © 2020 The Authors. Published by Elsevier Inc on behalf of American Society for Biochemistry and Molecular Biology.

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