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首页> 外文期刊>Molecular pharmacology. >Active-Site Tryptophan, the Target of Antineoplastic C-Terminal Binding Protein Inhibitors, Mediates Inhibitor Disruption of CtBP Oligomerization and Transcription Coregulatory Activities
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Active-Site Tryptophan, the Target of Antineoplastic C-Terminal Binding Protein Inhibitors, Mediates Inhibitor Disruption of CtBP Oligomerization and Transcription Coregulatory Activities

机译:活性位点,抗肿瘤C末端结合蛋白抑制剂的靶标,介导CTBP寡聚化和转录核心活性的抑制剂破坏

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摘要

C-terminal binding proteins (CtBP1/2) are oncogenic transcriptional coregulators and dehydrogenases often overexpressed in multiple solid tumors, including breast, colon, and ovarian cancer, and associated with poor survival. CtBPs act by repressing expression of genes responsible for apoptosis (e.g., PUMA, BIK) and metastasis-associated epithelial-mesenchymal transition (e.g., CDH1), and by activating expression of genes that promote migratory and invasive properties of cancer cells (e.g., TIAM1) and genes responsible for enhanced drug resistance (e.g., MDR1). CtBP's transcriptional functions are also critically dependent on oligomerization and nucleation of transcriptional complexes. Recently, we have developed a family of CtBP dehydrogenase inhibitors, based on the parent 2-hydroxyimino-3-phenylpropanoic acid (HIPP), that specifically disrupt cancer cell viability, abrogate CtBP's transcriptional function, and block polyp formation in a mouse model of intestinal polyposis that depends on CtBP's oncogenic functions. Crystallographic analysis revealed that HIPP interacts with CtBP1/2 at a conserved active site tryptophan (W318/324; CtBP1/2) that is unique among eukaryotic D2-dehydrogenases. To better understand the mechanism of action of HIPP-class inhibitors, we investigated the contribution of W324 to CtBP2's biochemical and physiologic activities utilizing mutational analysis. Indeed, W324 was necessary for CtBP2 self-association, as shown by analytical ultracentrifugation and in vivo cross-linking. Additionally, W324 supported CtBP's association with the transcriptional corepressor CoREST, and was critical for CtBP2 induction of cell motility. Notably, the HIPP derivative 4-chloro-HIPP biochemically and biologically phenocopied mutational inactivation of CtBP2 W324. Our data support further optimization of W318/W324-interacting CtBP dehydrogenase inhibitors that are emerging as a novel class of cancer cell-specific therapeutic.
机译:C-末端结合蛋白(CTBP1 / 2)是致癌转录核特征和脱氢酶,通常在多种实体肿瘤中过表达,包括乳腺癌,结肠和卵巢癌,并与存活率差相关。 CTBPS通过抑制负责凋亡(例如,PUMA,BIK)和转移相关的上皮 - 间充质转换(例如,CDH1)的基因表达,并通过激活促进癌细胞的迁移和侵袭性的基因的表达(例如,TIAM1 )和负责增强耐药性(例如MDR1)的基因。 CTBP的转录功能依赖性依赖于转录复合物的寡聚化和成核。最近,我们开发了一种基于母体2-羟基氨基-3-苯基丙酸(HIPP)的CTBP脱氢酶抑制剂系列,其特异性地破坏癌细胞活力,消除了CTBP的转录功能,并在肠道模型中阻断息肉形成涉及CTBP的致癌功能的息肉蛋白。结晶分析表明,HIPP在保守的活性位点OrtptoOphan(W318 / 324; CTBP1 / 2)中的CTBP1 / 2相互作用,其在真核D2-脱氢酶中是独特的。为了更好地了解HIPP级抑制剂的作用机制,我们调查了W324对CTBP2的生物化学和生理活动的贡献利用突变分析。实际上,W324是CTBP2自我关联所必需的,如分析超速离心和体内交联所示。此外,W324支持CTBP与转录铁芯压力集体的关联,对CTBP2诱导细胞运动性至关重要。值得注意的是,HIPP衍生物4-氯HIPP生物化学和生物学上的生物学上的突变突变灭活CTBP2 W324。我们的数据支持进一步优化W318 / W324 - 相互作用的CTBP脱氢酶抑制剂,其作为一种新颖的癌细胞特异性治疗方法。

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  • 来源
    《Molecular pharmacology.》 |2019年第1期|共10页
  • 作者单位

    Virginia Commonwealth Univ Dept Internal Med 1201 East Marshall St Box 980070 Richmond VA 23298;

    Virginia Commonwealth Univ Dept Internal Med 1201 East Marshall St Box 980070 Richmond VA 23298;

    Virginia Commonwealth Univ Dept Physiol &

    Biophys Richmond VA 23298 USA;

    Virginia Commonwealth Univ Dept Human &

    Mol Genet Richmond VA 23298 USA;

    Virginia Commonwealth Univ Dept Internal Med 1201 East Marshall St Box 980070 Richmond VA 23298;

    Virginia Commonwealth Univ Dept Internal Med 1201 East Marshall St Box 980070 Richmond VA 23298;

    Virginia Commonwealth Univ Dept Biostat Richmond VA 23298 USA;

    Virginia Commonwealth Univ Dept Med Chem Richmond VA 23298 USA;

    Virginia Commonwealth Univ Dept Internal Med 1201 East Marshall St Box 980070 Richmond VA 23298;

    Virginia Commonwealth Univ Dept Med Chem Richmond VA 23298 USA;

    Univ Massachusetts Sch Med Dept Biochem &

    Mol Pharmacol Worcester MA USA;

    Virginia Commonwealth Univ Dept Biostat Richmond VA 23298 USA;

    Virginia Commonwealth Univ Dept Physiol &

    Biophys Richmond VA 23298 USA;

    Virginia Commonwealth Univ Dept Internal Med 1201 East Marshall St Box 980070 Richmond VA 23298;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 药理学;
  • 关键词

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