通过家庭主体蛋白质的RNA识别和翻译调节
1Howard Hughes Medical Research Institute, Department of Genetics and Development, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.
Nature
|February 22, 1996
概括
德洛索菲拉的双体 (bcd) 蛋白不仅激活基因,而且还结合RNA来抑制尾部 (cad) 翻译. 这种双重功能为胚胎发育建立了对立的形态基因梯度,这对胚胎发育至关重要.
科学领域:
- 发展生物学 发展生物学
- 分子遗传学 分子遗传学
- 基因组学就是基因组学.
背景情况:
- 双体 (bcd) 形态基因梯度对于Drosophila胚胎的前部模式至关重要.
- bcd作为转录因子起作用,根据度值激活目标基因.
研究的目的:
- 为了研究双体 (bcd) 在调节尾巴 (cad) 基因中的作用.
- 探索BCD的潜在RNA结合能力及其对CAD翻译的影响.
主要方法:
- 对双体 (bcd) 蛋白与尾部 (cad) mRNA的相互作用进行分析.
- 调查bcd的翻译压制机制.
主要成果:
- 有证据表明,双体 (bcd) 直接与尾部 (cad) 信使RNA结合.
- bcd作为一个转化抑制剂,抑制cad蛋白合成.
- 这种相互作用涉及bcd主体域与cad 3'未翻译区域中的特定序列结合.
结论:
- 双体 (bcd) 具有双重功能:转录激活和翻译抑制.
- 通过bcd介导的cad转换的抑制有助于建立对立的形态原梯度.
- 这种机制在胚胎前后模式中提供了一种新的基因调节层.
相关概念视频
Regulation of Expression Occurs at Multiple Steps
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...
Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Regulation of Expression Occurs at Multiple Steps
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...
Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Regulation of Expression at Multiple Steps
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 addition of a...
Translational Regulation
Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...


