Journal Article

A role for paralog-specific sumoylation in histone deacetylase 1 stability

Simona Citro, Ellis Jaffray, Ronald T. Hay, Christian Seiser and Susanna Chiocca

in Journal of Molecular Cell Biology

Published on behalf of Chinese Academy of Sciences

Volume 5, issue 6, pages 416-427
Published in print December 2013 | ISSN: 1674-2788
Published online September 2013 | e-ISSN: 1759-4685 | DOI: https://dx.doi.org/10.1093/jmcb/mjt032
A role for paralog-specific sumoylation in histone deacetylase 1 stability

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Histone deacetylase 1 (HDAC1) is an essential epigenetic regulator belonging to a highly conserved family of deacetylases. Increased HDAC1 activity and expression often correlates with neoplastic transformation. Here we show how specific modification of HDAC1 by SUMO1, but not by SUMO2, facilitates HDAC1 degradation. Our findings reveal that SUMO1, but not SUMO2, conjugation to HDAC1 promotes HDAC1 ubiquitination and degradation. This is suggested by the observation that in non-tumorigenic mammary epithelial cells HDAC1 is preferentially conjugated to SUMO1 leading to HDAC1 proteolysis, whereas in breast cancer cells HDAC1 is more conjugated to SUMO2, promoting HDAC1 protein stability. SUMO E3 ligases play an important role in paralog-specific conjugation; in particular, the SUMO E3 ligase PIASy, which is overexpressed in breast cancer cells, selectively promotes the conjugation of HDAC1 to SUMO2. Therefore, cell environment affects paralog-specific sumoylation of HDAC1, whose conjugation to SUMO1 but not to SUMO2 facilitates its protein turnover. Our findings uncover a role for paralog-specific sumoylation of HDAC1 whose significance is emphasized by the use of HDAC inhibitors as anticancer drugs.

Keywords: breast cancer; HDAC1; PIAS; SUMO; ubiquitin

Journal Article.  6801 words.  Illustrated.

Subjects: Molecular and Cell Biology

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