関連する実験動画

Updated: May 5, 2026

Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays

Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays

Published on: November 12, 2012

E. coliの染色体上の2つのtRNATyr遺伝子群の構造と組織

J J Rossi, A Landy

|March 1, 1979

まとめ

E. coliの染色体は,異なる組織を持つ2つのタイロシンtRNA遺伝子 (tRNA1TyrとtRNA2Tyr) を含んでいます. tRNA1Tyr遺伝子はスペーサーで複製され,tRNA2Tyrは新しいtRNAを含むより大きなクラスタの一部です.

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
微生物学微生物学とは

背景:

E. coliの染色体には,チロシン受容型tRNA (tRNA1TyrとtRNA2Tyr) の遺伝子が含まれています.
以前の研究では,これらの遺伝子を特殊な変換ファグを用いて分析した.

研究の目的:

E. coliの染色体上のtRNA1TyrとtRNA2Tyrの遺伝子クラスターの構造と組織を決定する.
染色体組織をファグ分析の結果と比較する.

主な方法:

遺伝子配列と組織の比較分析.
E. coliの染色体DNA構造の検査. E. coliの染色体DNA構造の検査.
特殊なトランスデューシングファグDNAの分析.

主要な成果:

tRNA1Tyr遺伝子 (tyrT) は,ロ依存型転写終末部位を含む200bpのインタージェニック・スペーサーによって分離された2つの配列で構成されています.
tRNA2Tyr遺伝子 (tyrU) は,他のtRNA遺伝子:tRNA4Thr--8 bp--tRNA2Tyr--115 bp--tRNA2Gly--6 bp--tRNA3Thr.とクラスタ化された単一のコピーです.
tRNA2Tyrクラスタには,これまで記述されていないtRNA,tRNA4Thr.が含まれています.
ファージ分析は染色体組織を部分的に反映したが,不一致が認められた.

結論:

E. coliの染色体上のtRNA1TyrとtRNA2Tyrの遺伝子群の組織が解明されました.
直接的な染色体分析は,ファグの研究がネイティブ構造を完全に表現しない可能性があるため,正確な遺伝子組織にとって非常に重要です.
新型tRNA (tRNA4Thr) が,tRNA2Tyr遺伝子群の中で特定されました.

さらに関連する動画

Determination of the Optimal Chromosomal Locations for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach

Determination of the Optimal Chromosomal Locations for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach

Published on: September 11, 2017

Producing Gene Deletions in Escherichia coli by P1 Transduction with Excisable Antibiotic Resistance Cassettes

Producing Gene Deletions in Escherichia coli by P1 Transduction with Excisable Antibiotic Resistance Cassettes

Published on: September 1, 2018

関連する概念動画

Genomic DNA in Prokaryotes

Genomic DNA in Prokaryotes

The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
Genomic Diversity in Bacteria
Although bacterial genomes are much...

Prokaryotic Transcriptional Activators and Repressors

Prokaryotic Transcriptional Activators and Repressors

The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...

Prokaryotic Gene Structure and Organization

Prokaryotic Gene Structure and Organization

Prokaryotic genomes exhibit a streamlined organization of coding and non-coding regions essential for gene expression and protein synthesis. While coding regions contain the genetic instructions for proteins or functional RNAs, non-coding regions regulate the precise transcription and translation of these genes.Coding Regions: Proteins and RNAsThe primary coding regions, known as structural genes, include sequences transcribed into messenger RNA (mRNA) and ultimately translated into...

Coordination of Gene Expression Processes in Bacteria

Coordination of Gene Expression Processes in Bacteria

The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...

Repressible Operon: trp Operon

Repressible Operon: trp Operon

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...

Mechanism of Conjugation

Mechanism 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...