XB-ART-48132
Mol Cell Biol
2013 Aug 01;3315:2930-49. doi: 10.1128/MCB.01455-12.
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Pin1 regulates the dynamics of c-Myc DNA binding to facilitate target gene regulation and oncogenesis.
Farrell AS
,
Pelz C
,
Wang X
,
Daniel CJ
,
Wang Z
,
Su Y
,
Janghorban M
,
Zhang X
,
Morgan C
,
Impey S
,
Sears RC
.
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The Myc oncoprotein is considered a master regulator of gene transcription by virtue of its ability to modulate the expression of a large percentage of all genes. However, mechanisms that direct Myc's recruitment to DNA and target gene selection to elicit specific cellular functions have not been well elucidated. Here, we report that the Pin1 prolyl isomerase enhances recruitment of serine 62-phosphorylated Myc and its coactivators to select promoters during gene activation, followed by promoting Myc's release associated with its degradation. This facilitates Myc's activation of genes involved in cell growth and metabolism, resulting in enhanced proproliferative activity, even while controlling Myc levels. In cancer cells with impaired Myc degradation, Pin1 still enhances Myc DNA binding, although it no longer facilitates Myc degradation. Thus, we find that Pin1 and Myc are cooverexpressed in cancer, and this drives a gene expression pattern that we show is enriched in poor-outcome breast cancer subtypes. This study provides new insight into mechanisms regulating Myc DNA binding and oncogenic activity, it reveals a novel role for Pin1 in the regulation of transcription factors, and it elucidates a mechanism that can contribute to oncogenic cooperation between Pin1 and Myc.
???displayArticle.pubmedLink??? 23716601
???displayArticle.pmcLink??? PMC3719674
???displayArticle.link??? Mol Cell Biol
???displayArticle.grants??? [+]
CA129040 NCI NIH HHS , R01 CA100855 NCI NIH HHS , T32CA106195 NCI NIH HHS , P30 CA069533 NCI NIH HHS , R01 CA129040 NCI NIH HHS , T32 CA106195 NCI NIH HHS
Species referenced: Xenopus
Genes referenced: myc pin1
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