首页> 外文期刊>Journal of Molecular Biology >H3K4 Methyltransferase Activity Is Required for MLL4 Protein Stability
【24h】

H3K4 Methyltransferase Activity Is Required for MLL4 Protein Stability

机译:H3K4甲基转移酶活性是MLL4蛋白稳定性所必需的

获取原文
获取原文并翻译 | 示例
           

摘要

Transcriptional enhancers play a key role in cell type-specific gene expression and cell fate transition. Enhancers are marked by histone H3K4 mono- and di-methylation (H3K4me1/2). The tumor suppressor MLL4 (KMT2D) is a major enhancer H3K4 mono- and di-methyltransferase with a partial functional redundancy with MLL3 (KMT2C). However, the functional role of MLL4 enzymatic activity remains elusive. To address this issue, we have generated MLL4 enzyme-dead knock-in (KI) embryonic stem (ES) cells and mice, which carry Y5477A/Y5523A/Y5563A mutations in the enzymatic SET domain of the MLL4 protein. Homozygous MLL4 enzyme-dead KI (Mll4(KI/KI)) mice are embryonic lethal and die around E10.5, which phenocopies Mll4 knockout mice. Interestingly, enzyme-dead MLL4 protein in ES cells is highly unstable. Like Mll4 knockout ES cells, Mll4(KI/KI) ES cells show reduced levels of H3K4me1/2. Furthermore, we show that ectopic expression of histone H3.3 lysine 4-to-methionine (K4M) mutant, which reduces endogenous H3K4 methylation levels in ES cells, decreases the protein stability of MLL3 and MLL4 but not that of H3K4 methyltransferases SET1A (KMT2F) and SET1B (KMT2G). Taken together, our findings indicate that MLL4 protein stability is tightly regulated by its H3K4 methyltransferase activity. Published by Elsevier Ltd.
机译:转录增强在细胞类型特异性基因表达和细胞命运转变了关键作用。增强剂是由组蛋白H3K4单 - 和二甲基化(H3K4me1 / 2)标记。肿瘤抑制MLL4(KMT2D)是主要的增强子H3K4单 - 和二甲基转移与MLL3(KMT2C)的部分功能冗余。然而,MLL4酶活性的功能作用仍然遥遥无期。为了解决这个问题,我们已经产生MLL4酶死敲入(KI)胚胎干细胞(ES)细胞和小鼠,其携带Y5477A / Y5523A / Y5563A突变在MLL4蛋白质的酶SET结构域。纯合MLL4酶死KI(Mll4(KI / KI))小鼠是胚胎致死和模具周围E10.5,其phenocopies Mll4敲除小鼠。有趣的是,在ES细胞中的酶 - 死MLL4蛋白是高度不稳定的。像Mll4敲除ES细胞,Mll4(KI / KI)ES细胞显示出降低的H3K4me1 / 2的电平。此外,我们显示的那个异位表达的组蛋白H3.3赖氨酸4至甲硫氨酸(K4M)突变体,这降低了在ES细胞中的内源性H3K4甲基化水平,降低MLL3和MLL4的蛋白质的稳定性,但不是说的H3K4甲基转移SET1A(KMT2F )和SET1B(KMT2G)。总之,我们的研究结果表明,蛋白质MLL4稳定紧密由其H3K4甲基转移酶活性调节。 elsevier有限公司出版

著录项

  • 来源
    《Journal of Molecular Biology》 |2017年第13期|共9页
  • 作者单位

    NIDDK Lab Endocrinol &

    Receptor Biol NIH Bethesda MD 20892 USA;

    NIDDK Lab Endocrinol &

    Receptor Biol NIH Bethesda MD 20892 USA;

    NIDDK Lab Endocrinol &

    Receptor Biol NIH Bethesda MD 20892 USA;

    NHLBI Transgen Core NIH Bldg 10 Bethesda MD 20892 USA;

    NIDDK Lab Endocrinol &

    Receptor Biol NIH Bethesda MD 20892 USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 分子生物学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号