Activation of p53 transcriptional activity by SMRT

A histone deacetylase 3-independent function of a transcriptional corepressor

Anbu Karani Adikesavan, Sudipan Karmakar, Patricia Pardo, Liguo Wang, Shuang Liu, Wei Li, Carolyn L. Smith

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The silencing mediator of retinoic acid and thyroid hormone receptors (SMRT) is an established histone deacetylase 3 (HDAC3)-dependent transcriptional corepressor. Microarray analyses of MCF-7 cells transfected with control or SMRT small interfering RNA revealed SMRT regulation of genes involved in DNA damage responses, and the levels of the DNA damage marker γH2AX as well as poly(ADP-ribose) polymerase cleavage were elevated in SMRT-depleted cells treated with doxorubicin. A number of these genes are established p53 targets. SMRT knockdown decreased the activity of two p53-dependent reporter genes as well as the expression of p53 target genes, such as CDKN1A (which encodes p21). SMRT bound directly to p53 and was recruited to p53 binding sites within the p21 promoter. Depletion of GPS2 and TBL1, components of the SMRT corepressor complex, but not histone deacetylase 3 (HDAC3) decreased p21-luciferase activity. p53 bound to the SMRT deacetylase activation domain (DAD), which mediates HDAC3 binding and activation, and HDAC3 could attenuate p53 binding to the DAD region of SMRT. Moreover, an HDAC3 binding-deficient SMRT DAD mutant coactivated p53 transcriptional activity. Collectively, these data highlight a biological role for SMRT in mediating DNA damage responses and suggest a model where p53 binding to the DAD limits HDAC3 interaction with this coregulator, thereby facilitating SMRT coactivation of p53-dependent gene expression.

Original languageEnglish (US)
Pages (from-to)1246-1261
Number of pages16
JournalMolecular and Cellular Biology
Volume34
Issue number7
DOIs
StatePublished - Jan 1 2014

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Co-Repressor Proteins
Transcriptional Activation
Nuclear Receptor Co-Repressor 2
p53 Genes
DNA Damage
Poly(ADP-ribose) Polymerases
MCF-7 Cells
Microarray Analysis
Luciferases
Genetic Markers
Reporter Genes
Doxorubicin
Small Interfering RNA
histone deacetylase 3
Binding Sites
Gene Expression
Genes

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

Cite this

Activation of p53 transcriptional activity by SMRT : A histone deacetylase 3-independent function of a transcriptional corepressor. / Adikesavan, Anbu Karani; Karmakar, Sudipan; Pardo, Patricia; Wang, Liguo; Liu, Shuang; Li, Wei; Smith, Carolyn L.

In: Molecular and Cellular Biology, Vol. 34, No. 7, 01.01.2014, p. 1246-1261.

Research output: Contribution to journalArticle

Adikesavan, Anbu Karani ; Karmakar, Sudipan ; Pardo, Patricia ; Wang, Liguo ; Liu, Shuang ; Li, Wei ; Smith, Carolyn L. / Activation of p53 transcriptional activity by SMRT : A histone deacetylase 3-independent function of a transcriptional corepressor. In: Molecular and Cellular Biology. 2014 ; Vol. 34, No. 7. pp. 1246-1261.
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