多氨酸刺激翻译启动因子eIF5A2的蛋白质合成,参与mRNA解码,与eIF5A1不同
Masato Suzuki1, Takehiro Suzuki2, Yoshio Nakano1
1Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda, Chiba, Japan.
The Journal of biological chemistry
|July 5, 2025
概括
多氨酸通过miR-6514-5p调节真核细胞启动因子5A2 (eIF5A2) 转化,影响癌细胞生长. 这突出了eIF5A2的重点.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 癌症研究 癌症研究
背景情况:
- 多氨酸是所有生物体中必不可少的酸盐,对健康和疾病至关重要.
- eIF5A1和eIF5A2是相似的蛋白质,对功能至关重要,但它们的不同作用,特别是在癌症中,尚不清楚.
- 了解聚胺蛋白相互作用是解读生物过程的关键.
研究的目的:
- 阐明eIF5A1和eIF5A2.2之间的功能差异.
- 研究聚氨酸在调节eIF5A2.2.中的作用.
- 探索在癌症治疗中针对eIF5A2-聚胺相互作用的潜力.
主要方法:
- 通过多胺和miR-6514-5p研究了eIF5A2的翻译调节.
- 使用蛋白质组分析来比较eIF5A1和eIF5A2沉默细胞.
- 研究了多氨酸对核糖体蛋白表达的影响.
主要成果:
- eIF5A2,而不是eIF5A1,对癌细胞增殖至关重要.
- 多氨酸通过抑制miR-6514-5p促进eIF5A2的合成.
- 沉默eIF5A1和eIF5A2产生了不同的蛋白质组形状.
- 多氨酸可以调节癌症相关的核糖体蛋白质,如RPS27A,RPL36A和RPL22L1.1.
结论:
- 通过多胺和miR-6514-5p调节的eIF5A2驱动癌细胞的增殖.
- eIF5A2与核糖体之间的相互作用是癌症的潜在治疗标.
- 这项研究揭示了eIF5A2在癌症进展中的新型调节途径.
相关概念视频
02:33Initiation of Translation
34.6K
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...
34.6K
02:07Improving Translational Accuracy
11.9K
Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
11.9K
02:53Ribosomal RNA Synthesis
13.5K
Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
13.5K
02:28Leaky Scanning
5.2K
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...
5.2K
02:26tRNA Activation
20.1K
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
20.1K
01:23Stringent Response in E. coli
60
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
60