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The WDR5 WIN site interactome

ABSTRACT: The WIN site of WDR5 is a druggable pocket that is crucial for WDR5 protein function and carries therapeutic potential for treating cancer. This study evaluates the protein interactions affected by small molecule blockade of the WIN site of WDR5. We find that PDPK1 directly binds the WIN site of WDR5, and we investigate this newfound interaction through proteomic, biochemical, and genomic methods.

ORGANISM(S): Homo sapiens

PROVIDER: GSE150400 | GEO | 2021/01/19

REPOSITORIES: GEO

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WDR5 protein interactions at the WIN-site

Project description:The WIN site of WDR5 is a druggable pocket that impairs WDR5 protein function and carries therapeutic potential for treating cancer. This study evaluates the protein interactions affected by small molecule blockade of this surface on WDR5. Inhibited and uninhibited WDR5-containing complexes from HEK293 cells were quantitatively compared by SILAC-based proteomics. Of the high confidence proteins affected by this inhibition, one protein, PDPK1, was investigated further by mass spectrometry for identification of post translational modifications that could influence binding to WDR5.

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Project description:The WDR5 WIN site interactome

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WDR5 is a conserved regulator of protein synthesis gene expression

Project description:WDR5 is a highly-conserved nuclear protein that performs multiple scaffolding functions in the context of chromatin. WDR5 is also a promising target for pharmacological inhibition in cancer, with small molecule inhibitors of an arginine-binding pocket of WDR5 (the "WIN" site) showing efficacy against a range of cancer cell lines in vitro. Efforts to understand WDR5, or establish the mechanism of action of WIN site inhibitors, however, are stymied by its many functions in the nucleus, and a lack of knowledge of the conserved gene networks—if any—that are under its control. Here, we have performed comparative genomic analyses to identify the conserved sites of WDR5 binding to chromatin, and the conserved genes regulated by WDR5, across a diverse panel of cancer cell lines. We show that a specific cohort of protein synthesis genes (PSGs) are invariantly bound by WDR5, demonstrate that the WIN site anchors WDR5 to chromatin at these sites, and establish that PSGs are both acute and persistent targets of WIN site blockade. Together, these data reveal that WDR5 plays a predominant transcriptional role in biomass accumulation and reinforce the notion that WIN site inhibitors kill sensitive cancer cells by disrupting protein synthesis homeostasis.

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Project description:We discovered potent small molecule inhibitors against the WIN site of WDR5. These inhibitors selectively block the proliferation of mammalian cells carrying fusions of the MLL1 oncogene. Here, we show that these inhibitors result in the rapid displacement of WDR5 from chromatin in both sensitive (MV4:11) and non-sensitive (K562) cell lines, induce early changes in the distribution of active polymerases at a subset of WDR5-bound genes, and induce global transcript changes that are consistent with induction of the tumor suppressor p53.

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