EIF4B(真核翻译起始因子4B)属于EIF4基因家族,是翻译起始过程中的关键调控因子。该基因编码的蛋白质在mRNA翻译的起始阶段发挥重要作用,主要通过与EIF4F复合物(包括EIF4E、EIF4G和EIF4A)相互作用,促进核糖体与mRNA 5'端帽结构的结合,从而启动蛋白质合成。EIF4B的特点包括含有RNA结合域和多个磷酸化位点,这些位点可被多种激酶(如mTOR、S6K1)调控,影响其活性。突变或异常表达会导致翻译失调,与多种疾病相关,特别是癌症。例如,EIF4B在多种肿瘤中过表达,促进癌细胞的增殖和存活,部分原因是其增强了促癌蛋白的翻译效率。相反,降低EIF4B表达会抑制肿瘤生长,但可能影响正常细胞的蛋白质合成。EIF4B还与神经退行性疾病有关,其功能异常可能导致突触蛋白合成障碍。EIF4基因家族的共性在于它们均参与翻译起始调控,但各自功能不同,如EIF4E负责结合mRNA帽结构,EIF4G作为支架蛋白,而EIF4B则增强EIF4A的解旋酶活性。该家族的协调作用对细胞稳态至关重要,其异常与代谢疾病、病毒感染和发育缺陷也有关联。
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EIF4B基因(以及对应的蛋白质)的细胞分布位置:
EIF4B基因的本体(GO)信息:
| 名称 |
|---|
| 3013 RNA transport [PATH:hsa03013] |
| 4151 PI3K-Akt signaling pathway [PATH:hsa04151] |
| 4150 mTOR signaling pathway [PATH:hsa04150] |
| 5205 Proteoglycans in cancer [PATH:hsa05205] |
| 名称 |
|---|
| 3' -UTR-mediated translational regulation |
| Activation of the mRNA upon binding of the cap-binding complex and eIFs, and subsequent binding to 43S |
| Cap-dependent Translation Initiation |
| Deadenylation of mRNA |
| Deadenylation-dependent mRNA decay |
| Eukaryotic Translation Initiation |
| Gene Expression |
| GTP hydrolysis and joining of the 60S ribosomal subunit |
| IGF1R signaling cascade |
| Insulin receptor signalling cascade |
| IRS-mediated signalling |
| IRS-related events |
| IRS-related events triggered by IGF1R |
| L13a-mediated translational silencing of Ceruloplasmin expression |
| Metabolism of proteins |
| mTOR signalling |
| mTORC1-mediated signalling |
| PI3K Cascade |
| PKB-mediated events |
| Ribosomal scanning and start codon recognition |
| S6K1 signalling |
| S6K1-mediated signalling |
| Signal Transduction |
| Signaling by Insulin receptor |
| Signaling by Type 1 Insulin-like Growth Factor 1 Receptor (IGF1R) |
| Translation |
| Translation initiation complex formation |
| 疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
| Breast Carcinoma | 0.000271442 | 1 | 0 | BeFree |
| Granulosa cell tumor of the ovary | 0.000271442 | 1 | 0 | BeFree |
| Malignant neoplasm of breast | 0.000271442 | 1 | 0 | BeFree |
| Tumor Progression | 0.000271442 | 1 | 0 | BeFree |
| Tick-Borne Encephalitis | 0.000271442 | 1 | 0 | BeFree |
| Squamous cell carcinoma | 0.000271442 | 1 | 0 | BeFree |
| Prostate carcinoma | 0.000271442 | 1 | 0 | BeFree |
| Unipolar Depression | 0.000271442 | 1 | 0 | BeFree |
| Diffuse Large B-Cell Lymphoma | 0.000271442 | 1 | 0 | BeFree |
| Triple Negative Breast Neoplasms | 0.000271442 | 1 | 0 | BeFree |
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