微粒体铁硫集群组件蛋白的定位和功能
Alina V Goldberg1, Sabine Molik, Anastasios D Tsaousis
1Institute for Cell and Molecular Biosciences, The Catherine Cookson Building, Newcastle University, Newcastle upon Tyne NE2 4HH, UK.
Nature
|March 4, 2008
概括
微粒体的线粒体,曾经被认为是遗留的,对于铁-硫 (Fe-S) 集群组装至关重要,对蛋白质功能至关重要. 这项研究揭示了Fe-S生物发生作为这些寄生虫中关键的线粒体功能.
科学领域:
- 细胞生物学 细胞生物学
- 寄生虫学的寄生虫学
- 简介:真核生物的进化过程
背景情况:
- 微虫是具有高度减少的细胞结构的有义务的细胞内寄生虫.
- 线粒体是微粒体中的微粒体残留物,缺乏典型的线粒体功能.
- 微粒体拥有铁硫 (Fe-S) 集群组装的基因,暗示了线粒体的作用.
研究的目的:
- 为了研究在微粒体线粒体内的代谢功能和蛋白质定位.
- 阐明Fe-S集群组装机械在微粒生物学的作用.
- 了解早期分支的真核细胞中线粒体的进化意义.
主要方法:
- 在Encephalitozoon cuniculi和Trachipleistophora hominis中克隆和功能性表征Fe-S集群组合蛋白.
- 使用蛋白质标记和显微镜确定细胞区域的定位研究.
- 功能补充测试使用酵母模型来评估蛋白质活性.
主要成果:
- 微粒体Fe-S组合蛋白可以在功能上替代酵母同类物.
- 在E. cuniculi中,关键的Fe-S组件组件 (frataxin,Nfs1,Isu1) 定位在线粒体中.
- 在T. hominis中,必需的Fe-S成分显示出混合的细胞和线粒体局部化,这构成了协调挑战.
结论:
- 铁-硫集群生物合成是微粒体线粒体的关键功能.
- 线粒体不仅仅是残留的,而且积极参与重要的代谢途径.
- 在T. hominis中差异性蛋白质定位突出了微型虫寄生虫中复杂的调节机制.
相关概念视频
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...
Assembly of Complex Microtubule Structures
Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
Septins
Septins are protein filaments forming the cytoskeleton along with the microtubules, microfilaments, intermediate filaments, and other accessory proteins. In 1971 while studying the cell division cycle in mutant Saccharomyces cerevisiae Harwell et al. first identified the septin-related genes playing a crucial role in yeast cytokinesis. Fluorescence microscopy revealed that these proteins localize at the budding neck as rings. These ring-like proteins were then named Septins by John Pringle, and...
Vesicular Tubular Clusters
After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...
With the help of motor proteins such...
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...
Fungal Phylum Microsporidia
Microsporidia are a group of obligate intracellular fungi that were initially classified as protists but were later reclassified based on phylogenetic, molecular, and structural evidence linking them to the Chytridiomycota. These unicellular, non-motile organisms are highly specialized parasites that infect a wide range of animal hosts, including humans. They have evolved extensive genomic and metabolic reductions, making them highly dependent on their hosts for survival.Morphology and Genomic...


