pSC101プラズミドの分割におけるDNA超ヘリシティの役割
C A Miller1, S L Beaucage, S N Cohen
1Department of Genetics, Stanford University School of Medicine, California 94305-5120.
Cell
|July 13, 1990
まとめ
pSC101プラズミッドは,pSC101のプラズミッドとして
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- pSC101プラズミドのパーロクスは,細菌集団における安定した遺伝を保証する.
- プラズミッドの安定性は,細胞分裂中に遺伝要素を維持するために重要です.
研究 の 目的:
- プラズミド遺伝におけるDNAスーパーコイルの役割を調査する.
- プラズミドを安定させるpSC101パー領域のメカニズムを解明する.
主な方法:
- ワイルド型およびパー欠乏型pSC101プラズミドにおける超螺旋型の密度の比較.
- 異なる (化学的および変異的) スーパーコーリング条件下でのプラズミド損失率の評価.
- プラズミドの安定性に対するtopA変異の効果の分析.
主要な成果:
- パール領域が欠けているpSC101の派生は,超ヘリコプターの密度が低下しています.
- DNAのスーパーコイリングの減少は,パープラズミドの損失の増加につながります.
- topA変異によるスーパーコイリングの増加は,異なる複製システムにおける分割欠陥のプラズミッドを安定させます.
結論:
- DNAスーパーコイリングは,プラズミドの遺伝性と安定性に大きく影響します.
- pSC101対領域の安定効果は,DNAスーパーコイリングへの影響によって媒介される可能性が高い.
さらに関連する動画
11:12Determination of the Optimal Chromosomal Locations for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
Published on: September 11, 2017
6.8K
05:22Author Spotlight: Characterizing DNA Replication of Pathogenic Repeats to Uncover Mechanisms of Replication Fork Stalling and Expansion
Published on: September 13, 2024
1.3K
関連する概念動画
DNA Helicases
19.4K
DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
19.4K
DNA Topoisomerases
32.3K
Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
Types and Mechanism of action
Topoisomerases are divided into two main types. ...
Types and Mechanism of action
Topoisomerases are divided into two main types. ...
32.3K
Homologous Recombination
58.8K
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
58.8K
Single-Strand DNA Binding Proteins
12.9K
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
12.9K
Plasmids
4.2K
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...
4.2K
DNA Bacteriophages
1.6K
Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
1.6K
