由DNA间隔器产生的染色质损伤导致RNA聚合酶II的降解
Jaime A Espinoza1, Dimitris C Kanellis1, Sheetanshu Saproo1
1Science for Life Laboratory, Division of Genome Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 21 Stockholm, Sweden.
Nucleic acids research
|February 10, 2024
概括
新的DNA间隔器通过破坏染色体稳定性和RNA聚合酶功能来杀死癌细胞而不会损害DNA. 这些化合物通过向基本细胞过程,为癌症治疗提供了一种新的方法.
科学领域:
- 分子生物学分子生物学
- 癌症治疗方法 癌症治疗方法
- 染色体生物学 染色体生物学
背景情况:
- DNA间歇器主要以诱导癌症治疗中的DNA损伤而闻名.
- 新兴的DNA间隔器显示出细胞毒性作用而没有DNA损伤,影响转录,基因素驱逐和染色质捕获.
研究的目的:
- 调查新型DNA间隔剂 (BMH-21,Aclarubicin,Curaxin CBL0137) 对染色体生物学和RNA聚合酶的影响.
- 阐明它们的DNA损伤独立细胞毒性作用背后的机制.
主要方法:
- 对RNA聚合酶I,II和III染色体稳定性的分析.
- 评估Topoisomerase II (TOP2A,TOP2B) 在染色体上的捕获.
- 评估FACT陪伴者陷和质子驱逐的结果.
- 对Z-DNA积累的研究.
主要成果:
- 这些DNA间隔器使RNA聚合酶I,II和III的染色质不稳定.
- 它们诱导RNA聚合酶II降解和TOP2A/TOP2B捕获.
- BMH-21 抑制 Topoisomerase II,与 Aclarubicin 和 CBL0137 一起,导致 FACT 捕获,组织蛋白驱逐和 Z-DNA 积累.
结论:
- 新型DNA间歇器通过破坏染色质平衡和一般的转录机制来产生细胞毒性作用.
- 它们对染色质稳定性,RNA聚合酶功能和拓缺陷的影响为癌症治疗提供了新的治疗策略.
相关概念视频
Chromatin Structure Regulates pre-mRNA Processing
7.0K
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
7.0K
Translesion DNA Polymerases
10.0K
Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
10.0K
DNA Damage can Stall the Cell Cycle
9.2K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
9.2K
Eukaryotic RNA Polymerases
24.2K
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...
24.2K
Transcription Initiation
16.4K
Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...
The promoters and enhancers and their accessory proteins allow tight regulation of...
16.4K
Types of RNA
5.8K
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...
RNA Performs Diverse...
5.8K


