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相关概念视频

Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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Histone Modification02:32

Histone Modification

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
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Phase II Reactions: Acetylation Reactions

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Acetylation, a phase II biotransformation reaction, introduces an acetyl group to drugs or their metabolites. Acetyltransferase enzymes facilitate this reaction, which resembles α-amino acid conjugation due to the addition of a functional group to the drug molecule.
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Chromatin Modification in iPS Cells01:32

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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Updated: Jul 15, 2025

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

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乙化重编程MITF目标选择性和停留时间.

Pakavarin Louphrasitthiphol1,2, Alessia Loffreda3, Vivian Pogenberg4,5

  • 1Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Headington, Oxford, UK.

Nature communications
|September 28, 2023
PubMed
概括
此摘要是机器生成的。

在K206处的微眼症相关转录因子 (MITF) 乙化减少了其DNA结合,将其从分化转换为增殖标. 这种乙化机制解释了MITF如何调节细胞命运,以及为什么突变会导致瓦登堡综合征.

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科学领域:

  • 分子生物学分子生物学
  • 基因规则 基因规则
  • 癌症生物学 癌症生物学

背景情况:

  • 转录因子通过与特定的DNA序列结合来调节基因表达.
  • 微相关转录因子 (MITF) 对黑色素细胞发育和黑色素瘤至关重要,影响其增殖,分化和入侵.
  • MITF区分其目标基因的确切机制,特别是那些参与增殖与分化的基因,仍然不清楚.

研究的目的:

  • 调查MITF如何区分分化和扩散相关的DNA结合位点.
  • 阐明MITF乙化在调节其DNA结合特性和基因选择中的作用.

主要方法:

  • 对DNA上MITF停留时间的分析.
  • 在K206.6处对p300/CBP介导的MITF乙化进行调查.
  • 在乙化后评估MITF的DNA结合亲和力和基因偏好.

主要成果:

  • 与许多转录因子相比,MITF表现出明显更长的DNA结合停留时间.
  • 通过p300/CBP在K206的MITF的乙化减少了其停留时间和全基因组DNA结合亲和力.
  • K206乙化优选地将MITF结合从与分化相关的CATGTG动机转移到与扩散相关的CACGTG元素.

结论:

  • 在K206的MITF乙化起到分子开关的作用,抑制分化并促进增殖.
  • 这种乙化介导的机制为K206Q MITF突变与瓦登堡综合征的关联提供了功能性解释.
  • 了解MITF的调节机制对于黑色素细胞发育和黑色素瘤治疗策略至关重要.