eIF3针对细胞增殖信使RNA进行翻译激活或抑制
Amy S Y Lee1, Philip J Kranzusch2, Jamie H D Cate3
11] Department of Molecular &Cell Biology, University of California, Berkeley, Berkeley, California 94720, USA [2] Center for RNA Systems Biology, University of California, Berkeley, Berkeley, California 94720, USA.
Nature
|April 8, 2015
概括
细胞启动因子3 (eIF3) 通过结合特定的信使RNA来控制蛋白质合成. 这种对细胞生长至关重要的相互作用可以激活或抑制翻译,为癌症提供新的治疗点.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 蛋白质合成调节对于真核细胞细胞过程至关重要,包括发育和应激反应.
- 13个亚单元的真核细胞启动因子3 (eIF3) 复合体对于启动蛋白质翻译至关重要.
- eIF3的放松调节与癌症和发育异常有关,但其特定的mRNA目标和调节机制尚不清楚.
研究的目的:
- 在全基因组范围内识别与eIF3相互作用的人类转录.
- 阐明eIF3调节特定mRNA翻译的机制.
- 探索eIF3-mRNA相互作用对细胞过程和致癌性的影响.
主要方法:
- 可光激活的核糖核酸增强交联和免疫沉 (PAR-CLIP) 来绘制eIF3-RNA相互作用的地图.
- 对eIF3与特定mRNA结合的功能分析 (c-JUN,BTG1).
- 研究用于转化控制的RNA干环结合模式.
主要成果:
- 通过eIF3结合的特定mRNAs的全基因组识别,主要是在它们的5'未翻译区域.
- eIF3的目标是参与细胞生长控制的mRNA,包括细胞循环,分化和细胞亡.
- eIF3利用不同的RNA干环结合模式,以差异调节c-JUN和BTG1的翻译,同时作为激活剂和抑制剂.
结论:
- eIF3通过直接的mRNA结合来管理一种特殊的基因表达谱.
- 在翻译激活和压制方面,eIF3的双重作用凸显了其复杂的监管功能.
- 针对eIF3-mRNA相互作用是控制致癌的潜在策略.
相关概念视频
Regulation of Expression at Multiple Steps
1.6K
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
1.6K
Negative Regulator Molecules
39.2K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
39.2K
Mitogens and the Cell Cycle
8.5K
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
8.5K
mTOR Signaling and Cancer Progression
5.1K
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...
5.1K
Regulation of Expression Occurs at Multiple Steps
27.5K
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
27.5K
Eukaryotic Transcription Inhibitors
11.6K
Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a...
Eukaryotic transcription inhibitors usually contain two distinct domains, a...
11.6K


