单个结合体单个结合体单个结合体的有序和动态组合
Aaron A Hoskins1, Larry J Friedman, Sarah S Gallagher
1Department of Biochemistry and Molecular Pharmacology, Howard Hughes Medical Institute, University of Massachusetts Medical School, Worcester, MA 01605, USA.
概括
研究人员实时跟踪了结合体组合,揭示了从前mRNA中移除内子的顺序和可逆过程. 这条有序的路径影响了替代拼接规则.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 结合体是基因表达的关键分子机器,催化了从前信使RNA (前mRNA) 中的内子去除.
- 了解拼接体组装动态是阐明基因调节和替代拼接背后的机制的关键.
研究的目的:
- 为了可视化和分析单个结合体的实时组装.
- 为了确定与前mRNA.spliceosomal亚复合体关联的顺序和动态.
- 为了研究前mRNA到拼接通路的承诺点.
主要方法:
- 利用酵母基因工程进行精确的实验控制.
- 采用化学生物学工具来探测分子相互作用.
- 应用多波长光显微镜用于实时,单分子可视化全细胞提取物.
主要成果:
- 证明了spliceosomal亚复合体通过一个有序的途径顺序聚集在pre-mRNA上.
- 发现每个子综合体的关联是一个可逆的步骤.
- 确立了mRNA前对拼接的承诺随着组装的进展而逐渐增加,而不是早期事件.
结论:
- 结合体组装是一个动态的,有序的,可逆的过程.
- 阶段式组装影响了替代拼接的调节.
- 开发的实验方法为在近原生细胞环境中研究其他复杂的分子机器提供了强大的工具.
相关概念视频
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
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Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...
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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
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Protein Complex Assembly
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...


