细菌的结合性等离子体调动细菌和酵母之间的DNA转移
1Institute of Molecular Biology, University of Oregon, Eugene 97403.
Nature
|July 20, 1989
概括
大肠杆菌的结合性等离子体可以将DNA转移到酵母. 这种跨王国DNA转移具有细菌结合特征,可能在进化上具有重要意义.
科学领域:
- 微生物学 微生物学
- 遗传学 是一个遗传学.
- 酵母生物学的酵母生物学
背景情况:
- 大肠杆菌 (E. coli) 是一种以其通过结合性等离子体转移遗传物质的能力而闻名的细菌.
- 等离子体是染色体外的DNA元素,可以在细菌细胞内独立复制.
- 结合是细菌水平基因转移的一个关键机制.
研究的目的:
- 调查细菌结合性等离子体调解DNA转移到真核生物体Saccharomyces cerevisiae (酵母菌) 的能力.
- 探索细菌结合和这种观察到的跨王国DNA转移之间的机制相似之处.
- 评估这种王国间基因交换的潜在进化意义.
主要方法:
- 使用来自大肠杆菌的结合性塑体,用于DNA调动.
- 在受控的实验室条件下将这些等离子体引入酵母 (Saccharomyces cerevisiae).
- 分析从大肠杆菌传播到酵母菌的DNA传播的特征和效率.
主要成果:
- 通过结合性等离子体介导,成功地将大肠杆菌的DNA调动到Saccharomyces cerevisiae.
- 观察到DNA传播过程与细菌结合有几个关键特征.
- 确定了细菌和酵母菌之间基因交换的潜力.
结论:
- 大肠杆菌的结合性等离子体能够调解DNA转移到酵母.
- 观察到的跨王国DNA转移表现出类似于细菌结合的特征.
- 这个过程对促进不同生命王国的遗传交换具有潜在的进化意义.
相关概念视频
01:28Yeast Signaling
Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...
01:33Bacterial Transformation
In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
01:33Bacterial Transformation
In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
01:26Transformation
Microbial communities are dynamic environments where cell lysis releases free DNA into the surroundings. Other cells can take up this extracellular DNA through a process known as transformation.When a cell incorporates this foreign DNA into its genome, resulting in genetic modification, the process is known as transformation. Cells capable of this process are termed competent. Competence can be natural, as observed in certain bacteria and archaea, or artificially induced in the...
01:19Conjugation
Conjugation is a form of horizontal gene transfer that primarily occurs in bacteria and some archaea, promoting genetic diversity and adaptation. Bacteria can acquire resistance genes through conjugative plasmids, allowing them to survive antibiotic treatments that would otherwise be lethal. This process involves direct contact between cells through specialized structures such as the sex pilus and is mediated by conjugative plasmids, including the F (fertility) factor.Conjugation requires...
01:19Mechanism of Conjugation
Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...