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1.  Chemical Genetic Screening for Compounds that Preferentially Inhibit Growth of Methylthioadenosine Phosphorylase (MTAP) Deficient Saccharomyces Cerevisiae 
Methylthioadenosine phosphorylase (MTAP), a key enzyme in the methionine salvage pathway, is inactivated in a variety of human cancers. Since all human tissues express MTAP, it would be of potential interest to identify compounds that selectively inhibit the growth of MTAP deficient cells. To determine if MTAP inactivation could be targeted, we have performed a differential chemical genetic screen in isogenic MTAP+ and MTAP− S. cerevisiae. A low molecular weight compound library containing 30,080 unique compounds was screened for those that selectively inhibit growth of MTAP− yeast using a differential growth assay. One compound, containing a 1,3,4-thiadiazine ring, repeatedly showed a differential dose response, with MTAP− cells exhibiting a four-fold shift in IC50 compared to MTAP+ cells. Several structurally related derivatives of this compound also showed enhanced growth inhibition in MTAP− yeast. These compounds were also examined for growth inhibition of isogenic MTAP+ and MTAP− HT1080 fibrosarcoma cells, and four of the five compounds exhibited evidence of modest, but significant, increased potency in MTAP− cells. In summary, these studies show the feasibility of differential growth screening technology and have identified a novel class of compounds that can preferentially inhibit growth of MTAP− cells.
doi:10.1177/1087057110386371
PMCID: PMC3019245  PMID: 21131597
Methionine Salvage Pathway; Drug screening; Yeast; Genetic-chemical interaction
2.  Isoform-selective chemical inhibition of mDia-mediated actin assembly 
Biochemistry  2009;48(40):9327-9329.
Formins are potent actin assembly factors. Diaphanous formins, including mDia1, mDia2, and mDia3 in mammals, are implicated in mitosis and cytokinesis but no chemical interactors have been reported. We developed an in vitro screen for inhibitors of actin assembly by mDia1, and identified an inhibitor of mDia1 and mDia2 that does not inhibit mDia3 at the concentrations tested. These results establish the druggability of mDia formins and introduce a first generation inhibitor.
doi:10.1021/bi901354z
PMCID: PMC2758331  PMID: 19764708

Results 1-2 (2)