関連する実験動画
Updated: May 7, 2026
10:41
Identifying Amino Acid Overproducers Using Rare-Codon-Rich Markers
Published on: June 24, 2019
バクテリア遺伝子のN端コドンバイアスの原因と効果
Daniel B Goodman1, George M Church, Sriram Kosuri
1Wyss Institute for Biologically Inspired Engineering, 3 Blackfan Circle, Boston, MA 02115, USA.
Science (New York, N.Y.)
|September 28, 2013
まとめ
遺伝子の初期に希少なコドンを使用すると,タンパク質の生産が著しく増加します. この効果は,コードンの希少性ではなく,RNA構造の減少によるもので,遺伝子発現を最適化する新しい方法を提供している.
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
- バイオテクノロジー バイオテクノロジー
背景:
- コドンの選択は,タンパク質発現レベルに大きな影響を与えます.
- 希少なコドンは,生物全体で遺伝子のN端で頻繁に発見されますが,理由と結果は依然として議論されています.
研究 の 目的:
- エシェリキア・コライ菌の遺伝子発現に対するN端の希少コドンの影響を調査する.
- N端のコドン利用に関連した発現変化を誘発する根本的なメカニズムを決定する.
- 異質遺伝子発現の最適化における応用を探求する.
主な方法:
- E. coli の 14,000 以上の合成遺伝子レポーターの構築と分析.
- 個々のN末端コドンによって影響される表現レベルの定量化.
- 発現に影響を与える要因としてRNA構造とコドン希少性の評価.
主要な成果:
- N端の希少コドンは,遺伝子の発現を平均4倍増加させ,最大14倍に達しました.
- 特定のN末端コドンが発現に影響を与え,自然な遺伝子配列を形作ることが示されました.
- コドン希少性ではなく,RNA二次構造の減少が,発現増強の主要な原動力として特定されました.
結論:
- N端のコドンバイアスは,タンパク質発現を調節する上で重要な役割を果たします.
- N端のRNA構造の減少は,発現の増大の鍵である.
- この発見は,バクテリアの異質タンパク質の生産を高めるための実用的な戦略を提供します.
関連する概念動画
03:06From DNA to Protein
The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
01:31Translation
Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
01:31Translation
Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
01:25The Central Dogma
Overview
01:20The Central Dogma
The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
02:46Genome Copying Errors
DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their survival. Therefore, the copying errors are checked and repaired at three levels.