Novel small-molecule inhibitors of RNA polymerase III

被引:69
作者
Wu, LP
Pan, J
Thoroddsen, V
Wysong, DR
Blackman, RK
Bulawa, CE
Gould, AE
Ocain, TD
Dick, LR
Errada, P
Dorr, PK
Parkinson, T
Wood, T
Kornitzer, D
Weissman, Z
Willis, IM
McGovern, K
机构
[1] Millennium Pharmaceut Inc, Cambridge, MA USA
[2] Pfizer Global Res & Dev, Sandwich, Kent, England
[3] B Rappaport Fac Med, Haifa, Israel
[4] Albert Einstein Coll Med, Bronx, NY 10467 USA
关键词
D O I
10.1128/EC.2.2.256-264.2003
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
A genetic approach utilizing the yeast Saccharomyces cerevisiae was used to identify the target of antifungal compounds. This analysis led to the identification of small molecule inhibitors of RNA polymerase (Poll) III from Saccharomyces cerevisiae. Three lines of evidence show that UK-118005 inhibits cell growth by targeting RNA Poll III in yeast. First, a dominant mutation in the g domain of Rpo31p, the largest subunit of RNA Pol III, confers resistance to the compound. Second, UK-118005 rapidly inhibits tRNA synthesis in wild-type cells but not in UK-118005 resistant mutants. Third, in biochemical assays, UK-118005 inhibits tRNA gene transcription in vitro by the wild-type but not the mutant Pol III enzyme. By testing analogs of UK-118005 in a template-specific RNA Poll III transcription assay, an inhibitor with significantly higher potency, ML-60218, was identified. Further examination showed that both compounds are broad-spectrum inhibitors, displaying activity against RNA Pol III transcription systems derived from Candida albicans and human cells. The identification of these inhibitors demonstrates that RNA Pol III can be targeted by small synthetic molecules.
引用
收藏
页码:256 / 264
页数:9
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