単一鎖DNA結合タンパク質 アグロバクテリア・トゥメファシエンス (Agrobacterium tumefaciens) の virEロクスによってコードされている
まとめ
研究者らは,Agrobacterium tumefaciens.で新しい単一鎖DNA結合タンパク質を特定しました. 植物感染時にT-DNAの転送に不可欠なこのタンパク質は,virE遺伝子によってコード化されています.
科学分野:
- 微生物学 微生物学とは
- 分子生物学は分子生物学である.
- 植物病理学 植物病理学
背景:
- Agrobacterium tumefaciensによる変換は,Tiプラズミドから植物細胞へのT-DNAの転送に依存しています.
- このプロセスは,アセトシリンゴンのような植物信号分子によって誘発され,毒性 (ウイルス) 遺伝子を活性化します.
- ウイルスの遺伝子製品は,単一鎖のT-DNA分子 (T鎖) を合成し,転送を媒介し,潜在的にDNA-タンパク質複合体として作用する.
研究 の 目的:
- Agrobacterium tumefaciens.によって媒介されるT-DNA転送プロセスに関与する新しいタンパク質を特定する.
- 新しく発見されたウイルス特異の単一鎖DNA結合タンパク質を特徴付けるため.
主な方法:
- ノパリン型Tiプラズミドを宿しているアグロバクテリアの69キロダルトンのタンパク質の識別.
- DNAの結合特性 (単鎖対双鎖DNA) を決定する生化学的分析.
- タンパク質の同一性を確認するために,Escherichia coliにおけるvirE領域の分子クローニングと発現.
主要な成果:
- 単一鎖DNAを結合する69キロダルトンの新しいウイルス特異タンパク質が特定されました.
- タンパク質は,単一鎖のDNAに配列独立の結合を示したが,二鎖のDNAには結合しなかった.
- 誘導されたアグロバクテリアにおけるタンパク質の特性と豊富さは,それがvirEロカス産物であることを示唆しており,これはクローン化と発現によって確認された.
結論:
- 特定された69kDaタンパク質は,Agrobacterium tumefaciensのT-DNA転送に不可欠なウイルス特異の単一鎖DNA結合タンパク質です.
- このタンパク質は,virE locus.の産物である.
- この発見は,アグロバクテリア媒介による変換の分子機構の理解に貢献します.
さらに関連する動画
11:16A Hydroponic Co-cultivation System for Simultaneous and Systematic Analysis of Plant/Microbe Molecular Interactions and Signaling
Published on: July 22, 2017
11:33Investigating Interactions Between Histone Modifying Enzymes and Transcription Factors in vivo by Fluorescence Resonance Energy Transfer
Published on: October 14, 2022
関連する概念動画
Single-Strand DNA Binding Proteins
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...
DNA Bacteriophages
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...
Cooperative Binding of Transcription Regulators
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
Cooperative Binding of Transcription Regulators
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
Cis-regulatory Sequences
Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
Cis-regulatory Sequences
Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
