在细胞运动过程中氧化损伤的蛋白质的不对称继承
Hugo Aguilaniu1, Lena Gustafsson, Michel Rigoulet
1Department of Cell and Molecular Biology-Microbiology, Göteborg University, Göteborg, Sweden.
概括
氧化损坏的蛋白质会随着年龄的增长而积聚在酵母细胞中. 一个特定的基因 (sir2) 对母细胞至关重要,以防止这些受损的蛋白质传递给子细胞,从而增强新生儿细胞的健康.
科学领域:
- 细胞衰老 细胞衰老
- 氧化压力生物学
- 酵母遗传学 酵母遗传学
背景情况:
- 损坏的蛋白质的积累与细胞衰老有关.
- 了解不对称遗传是细胞健康的关键.
- 自由基有助于细胞损伤.
研究的目的:
- 为了可视化和量化衰老酵母中的碳化蛋白质.
- 研究细胞分裂过程中受损蛋白质的遗传模式.
- 确定sir2基因在蛋白质保留中的作用.
主要方法:
- 碳化蛋白质的单细胞可视化.
- 在酵母细胞运动过程中对蛋白质遗传的分析.
- 野生型和sir2突变酵母菌株的比较.
主要成果:
- 在Saccharomyces cerevisiae中,碳化蛋白随着复制年龄的增长而积聚.
- 损坏的蛋白质不会被子细胞遗传.
- 丢失sir2基因会损害母细胞中氧化损伤的蛋白质的保留.
结论:
- 损坏的蛋白质的不对称遗传是酵母中一个关键的衰老机制.
- 在这个过程中,sir2基因起着至关重要的作用.
- 这种机制可以保护新生儿细胞免受氧化损伤,有助于长寿.
相关概念视频
Mismatch Repair
Overview
Mutations
Overview
Proteins: From Genes to Degradation
Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick. Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
Transcription is the synthesis of RNA molecules by RNA...
Transcription is the synthesis of RNA molecules by RNA...
Genome Copying Errors
DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their survival. Therefore, the copying errors are checked and repaired at three levels.
Mutations
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Mismatch Repair
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...


