在c-myc翻译期间的核糖体停滞,呈现出可操作的癌细胞脆弱性
Tejinder Pal Khaket1, Suman Rimal1, Xingjun Wang1
1Department of Pathology and Programs in Neuroscience and Cancer Biology, Stanford University School of Medicine, Stanford, CA 94305, USA.
PNAS nexus
|August 20, 2024
概括
核糖体质量控制 (RQC) 维持了Myc蛋白水平. 针对c-Myc翻译中的核糖体停滞,揭示了癌细胞的脆弱性,提供了新的治疗策略.
科学领域:
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
- 翻译控制 翻译控制
背景情况:
- Myc是许多癌症的关键驱动因素,其高水平的蛋白质对瘤发育至关重要.
- 调节Myc蛋白表达的机制尚未完全理解.
- 核糖体关联质量控制 (RQC) 途径管理蛋白质合成的忠实性.
研究的目的:
- 研究RQC在调节Myc蛋白水平中的作用.
- 确定在c-Myc合成期间涉及管理翻译应激的因素.
- 探索与c-Myc翻译相关的潜在治疗漏洞.
主要方法:
- 在c-Myc转化过程中对核糖体停滞的分析.
- 研究RQC因子ZNF598在c-Myc调节中的作用.
- 对ZNF598和SARS-CoV-2 Nsp1对质母细胞瘤 (GBM) 细胞和Drosophila模型的影响的评估.
- 研究NSP1和ATP结合盒子子子家族E成员1之间的合成毒性.
主要成果:
- 核糖体在c-Myc转化过程中停滞,需要RQC因子ZNF598.8.
- ZNF598在GBM上调节,并促进c-Myc水平和瘤生长.
- 通过与ZNF598.8相互作用,SARS-CoV-2 Nsp1抑制了c-Myc的翻译.
- Nsp1和ATP结合盒子子子家族E成员1显示合成毒性,降低c-Myc的调节和抑制瘤生长.
结论:
- RQC对于维持Myc蛋白水平至关重要.
- 在c-Myc转化过程中准核糖体停滞,呈现出一种新的癌症脆弱性.
- ZNF598和NSP1的相互作用为癌症进展和潜在的治疗干预提供了洞察力.
相关概念视频
mTOR Signaling and Cancer Progression
3.8K
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
3.8K
Translation
14.7K
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Proteins are...
Translation Produces the Building Blocks of Life
Proteins are...
14.7K
Leaky Scanning
5.1K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.1K
The Nucleolus
8.7K
The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
8.7K
Initiation of Translation
32.0K
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
32.0K
Nonsense-mediated mRNA Decay
10.6K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
10.6K


