相关实验视频
Updated: Jan 13, 2026

06:29
Studying Protein Import into Chloroplasts Using Protoplasts
Published on: December 10, 2018
10.3K
菌体类型塑性RNA聚合酶的膜交互伙伴在叶绿体发育过程中对塑性基因表达产生有限影响
Yushi Kurotaki1, Yuki Hagiwara1, Kosei Noto1
1Department of Biology, Graduate School of Agriculture and Life Science Hirosaki University Hirosaki Aomori Japan.
Plant direct
|January 9, 2026
概括
植物中的核编码RNA聚合酶 (NEP) 活性稳定,不受光或NIP蛋白质的影响. 在叶绿体发育过程中,RPOTmp-依赖转录保持不变,这挑战了以前的假设.
科学领域:
- 植物分子生物学 植物分子生物学
- 叶绿体基因表达的基因表达.
- 转录法规 转录法规
背景情况:
- 血管植物利用核编码 (NEP) 和塑编码 (PEP) RNA聚合酶进行塑基因转录.
- 尤迪科特有两种NEP异型,即RPOTp和RPOTmp,对塑维护和发育至关重要.
- 人们对RPOTmp的调控机制,特别是它与NEP交互蛋白 (NIP1,NIP2) 的相互作用,了解得很少.
研究的目的:
- 调查植物发芽和脱菌过程中RPOTmp的调节机制.
- 阐明光照条件和NIP蛋白在控制RPOTmp活动中的作用.
- 改进质细胞发育中的RPOTmp调节模型.
主要方法:
- 在Arabidopsis突变物中对RPOTmp和NIP的功能分析.
- 在黑暗发芽和光诱导脱过程中对转录的评估.
- 对 RPOTmp 和 NIP 蛋白质的遗传学分析.
主要成果:
- 取决于RPOTmp的16SrRNA转录在吸收的种子中是活跃的,并且在发芽后保持在基底水平,无论光线如何.
- 在发芽和脱过程中,NIP蛋白对RPOTmp功能的影响有限.
- 遗传学分析表明,NIP与RPOTmp有着不同的进化轨迹.
结论:
- 在整个叶绿体分化过程中,RPOTmp活性是稳定的,并且不会受到光或NIPs的显著调节.
- 拟议的模型表明,在这些发展阶段,RPOTmp可以独立于光和NIP运行.
- 阿拉比多普西斯很可能缺乏其他与塑调节有关的类似NIP的蛋白质.
相关概念视频
Protein Transport to the Inner Chloroplast Membrane
2.4K
Proteins targeted to the inner chloroplast membrane, or plastid proteins, are transported by two general pathways: the stop-transfer and the re-insertion or post-import pathways. Most plastid proteins carry N-terminal transit sequences and internal import sequences targeting it to the specific chloroplast subcompartment. Proteins targeted by the stop-transfer pathway have internal hydrophobic sequences that inhibit their translocation into the stroma. As a result, these precursors are arrested...
2.4K
Export of Mitochondrial and Chloroplast Genes
4.1K
A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
4.1K
Protein Transport to the Outer Chloroplast Membrane
2.3K
Chloroplast outer membrane proteins encoded by the nucleus are synthesized in the cytosol. Soon after synthesis, they bind cytosolic factors such as 14-3-3 protein and the Hsp70 chaperones that keep these precursors in an unfolded state until their translocation.
Two models describe the mechanism of precursor recognition and entry across the outer membrane through the TOC complex. Model 1 suggests the newly synthesized precursor binds to the TOC receptor 159 and forms a complex.
Two models describe the mechanism of precursor recognition and entry across the outer membrane through the TOC complex. Model 1 suggests the newly synthesized precursor binds to the TOC receptor 159 and forms a complex.
2.3K
Bacterial RNA Polymerase
32.5K
Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
32.5K
Bacterial RNA Polymerase
11.5K
11.5K
Plasmids
1.1K
Plasmids are extrachromosomal DNA molecules found in bacteria, archaea, and some eukaryotic microbes like yeast. These small, circular DNA structures typically contain fewer than 30 genes, although some may exist linearly. Plasmids vary in their number within a cell, known as copy number. Single-copy plasmids are present in one copy per cell and multi-copy plasmids are present in multiple copies, reaching over 100 copies per cell.Plasmids usually replicate independently of the chromosomal DNA...
1.1K

