概括
研究人员在Tn21中发现了一种新基因tnpM,该基因编码了一个调节蛋白. 这种蛋白质增强了转移,抑制了同整合分辨率,与其他已知的转位子不同.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 微生物学 微生物学
背景情况:
- 转子子是移动的遗传元素,在基因组进化中发挥着重要作用.
- 调节协同集成中间体的转化和分离对于控制转子活性至关重要.
- 与Tn3和Tn1000相比,Tn21和Tn501是相关的转位子,具有不同的调节机制.
研究的目的:
- 在Tn21转位子中识别和描述新的监管元素.
- 阐明新发现的tnpM基因在Tn21转换和分辨过程中的功能.
- 将Tn21和Tn501的调节策略与其他特征转位子进行比较.
主要方法:
- 来自Tn21的tnpM基因的基因鉴定和克隆.
- 在体内功能测试以评估tnpM对转移和同整合分辨率的影响.
- 使用与Tn501.1的亚克隆tnpM基因进行的转补实验.
- 对Tn501进行序列分析,以确定潜在的同类编码区域.
主要成果:
- 在Tn21中发现了一种编码12.6kDa调节蛋白的新型基因tnpM.
- 发现Tn21 tnpM蛋白在体内增强了Tn21的转移,并抑制了同整合的分辨率.
- 来自Tn21的tnpM基因可以在转补实验中调节Tn501的转化和分辨率.
- 一个潜在的tnpM编码序列被确定为Tn501解决酶基因的上游.
结论:
- Tn21具有独特的调节机制,涉及tnpM调节蛋白.
- tnpM基因在调节转换和分辨功能方面发挥着至关重要的作用.
- 与Tn3和Tn1000相比,Tn21和Tn501表现出不同的基因组组织和转移的调控策略.
相关概念视频
Overview of Transposition and Recombination
16.3K
Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
16.3K
LTR Retrotransposons
18.1K
LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
18.1K
RNA Polymerase II Accessory Proteins
8.9K
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
8.9K
Co-activators and Co-repressors
7.0K
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
7.0K
Transcription Attenuation in Prokaryotes
14.6K
Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure. Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
14.6K
Repressible Operon: trp Operon
2.8K
The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
2.8K


