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Updated: Jun 2, 2026
09:16
Oligopeptide Competition Assay for Phosphorylation Site Determination
Published on: May 18, 2017
STAT1 signaling is not regulated by a phosphorylation-acetylation switch
Filipa Antunes1, Andreas Marg, Uwe Vinkemeier
1School of Biomedical Sciences, Nottingham University Medical School, Nottingham, United Kingdom.
Molecular and Cellular Biology
|May 18, 2011
Summary
Histone deacetylase inhibitors (HDACi) do not acetylate STAT1, contrary to previous reports. This study questions the proposed role of STAT1 acetylation in HDACi
Area of Science:
- Molecular Biology
- Cell Biology
- Immunology
Background:
- Histone deacetylase inhibitors (HDACi) are investigated for treating inflammatory diseases.
- Previous studies proposed STAT1 acetylation at K410/K413 regulates apoptosis and immune responses.
- This acetylation was suggested as a key mechanism for HDACi therapeutic effects.
Purpose of the Study:
- To re-evaluate the effect of deacetylase inhibition on STAT1 acetylation.
- To investigate the functional consequences of mutating STAT1 acetylation sites (K410/K413).
- To clarify the role of STAT1 acetylation in HDACi-mediated effects.
Main Methods:
- Cell treatment with HDAC inhibitors.
- Site-directed mutagenesis of STAT1 (K410Q/K413Q).
- Analysis of STAT1 acetylation, tyrosine phosphorylation, DNA binding, and nuclear import.
Main Results:
- HDAC inhibition did not affect STAT1 acetylation or tyrosine phosphorylation.
- STAT1 K410Q/K413Q mutations did not alter tyrosine phosphorylation but impaired DNA binding and nuclear import.
- These findings challenge the proposed role of STAT1 acetylation in HDACi mechanisms.
Conclusions:
- STAT1 acetylation at lysines 410 and 413 is not induced by deacetylase inhibition.
- The observed effects of HDACi are not mediated by STAT1 acetylation.
- Clinical benefits of HDACi in inflammatory diseases likely involve other mechanisms.
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