Cooperation between SMYD3 and PC4 drives a distinct transcriptional program in cancer cells

Nucleic Acids Research
Jin-Man KimWoojin An

Abstract

SET and MYND domain containing protein 3 (SMYD3) is a histone methyltransferase, which has been implicated in cell growth and cancer pathogenesis. Increasing evidence suggests that SMYD3 can influence distinct oncogenic processes by acting as a gene-specific transcriptional regulator. However, the mechanistic aspects of SMYD3 transactivation and whether SMYD3 acts in concert with other transcription modulators remain unclear. Here, we show that SMYD3 interacts with the human positive coactivator 4 (PC4) and that such interaction potentiates a group of genes whose expression is linked to cell proliferation and invasion. SMYD3 cooperates functionally with PC4, because PC4 depletion results in the loss of SMYD3-mediated H3K4me3 and target gene expression. Individual depletion of SMYD3 and PC4 diminishes the recruitment of both SMYD3 and PC4, indicating that SMYD3 and PC4 localize at target genes in a mutually dependent manner. Artificial tethering of a SMYD3 mutant incapable of binding to its cognate elements and interacting with PC4 to target genes is sufficient for achieving an active transcriptional state in SMYD3-deficient cells. These observations suggest that PC4 contributes to SMYD3-mediated transactivation primarily by sta...Continue Reading

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Methods Mentioned

BETA
PCR
immunoprecipitation
transfection
co-immunoprecipitation
ChIP
immunoprecipitations
Pull-down
circular dichroism
affinity purification

Software Mentioned

TagScan
GSEA
Insight
Ingenuity pathway software
ArrayPipe

Related Concepts