在Trypanosoma brucei进化过程中,Pam16和Pam18被重新使用,以调节线粒体DNA的复制
Corinne von Känel1, Philip Stettler1, Carmela Esposito1
1Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Bern, Switzerland.
PLoS biology
|August 15, 2024
概括
在Trypanosoma brucei中,TbPam16和TbPam18调节最大循环复制,而不是蛋白质进口. 一个带有MaRF11的新复合体控制了这种必不可少的线粒体基因组复制.
科学领域:
- 线粒体生物学 线粒体生物学
- 寄生虫学的寄生虫学
- 分子遗传学 分子遗传学
背景情况:
- 蛋白质进口和基因组复制对线粒体至关重要.
- 帕姆16和帕姆18蛋白调节线粒体内膜蛋白质的进口.
- 在Trypanosoma brucei中,TbPam16和TbPam18是必不可少的,但不参与蛋白质进口.
研究的目的:
- 研究TbPam16和TbPam18在Trypanosoma brucei中的功能.
- 要了解这种寄生虫中线粒体基因组复制的调节.
- 为了识别参与最大循环复制的新型蛋白质.
主要方法:
- 研究了TbPam18和TbPam16在Trypanosoma brucei中的作用.
- 分析了它们的J域和跨膜域的功能.
- 进行了拉下测试,以确定相互作用的蛋白质.
- 研究了线粒体蛋白质酶枯竭对蛋白质水平的影响.
主要成果:
- TbPam18和TbPam16调节最大循环复制,而不是蛋白质进口.
- 它们的J域不活跃,但跨膜域至关重要.
- 一种新型蛋白质MaRF11被确定为TbPam16的客户端.
- MaRF11或TbPam18/TbPam16的耗尽导致最大圆损失.
- 线粒体蛋白质酶调节了MaRF11的水平.
结论:
- 一个新的TbPam18,TbPam16和MaRF11的蛋白质复合体控制着最大循环的复制.
- MaRF11在TbPam18和TbPam16.6的下游运行.
- 线粒体蛋白酶体调节MaRF11水平,影响最大圆稳定性.
相关概念视频
Animal Mitochondrial Genetics
7.5K
Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
7.5K
Conservation of Protein Domains Over Different Proteins
10.8K
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
10.8K
Mitochondrial Precursor Proteins
2.5K
Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70 chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
Most of the mitochondrial...
2.5K
Structure of Porins
2.9K
Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
2.9K
Exon Recombination
3.6K
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...
Exon shuffling follows “splice frame rules.” Each exon...
3.6K
Mitochondrial Protein Sorting
4.3K
Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death. Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
4.3K


