プレペプチド遺伝子の置換とバチルス・セレウスによるin vivo処理によるチオシリン変種の生成
Michael G Acker1, Albert A Bowers, Christopher T Walsh
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, USA.
Journal of the American Chemical Society
|November 17, 2009
まとめ
研究者らは前駆体ペプチド遺伝子を改変することによって,新種のチオシリン変種を設計した. この構造-活性関係の探求は,これらの強力な天然製品抗生物質の薬理学的な制限を克服することを目的としています.
科学分野:
- 自然製品化学とは
- 微生物学 微生物学とは
- 薬剤化学 薬剤化学について
背景:
- ティオシリンは,リボソームで合成されたペプチドから派生した強力な天然製品抗生物質です.
- 成熟したマクロサイクル化合物を形成するには,広範な翻訳後の修正が必要である.
- 薬動性の悪い性質は,チオシリンの臨床応用を妨げています.
研究 の 目的:
- 改良された特性を持つ新しいチオシリン変種を生成する.
- ティオシリン前駆体ペプチドの成熟を制御する構造-活性関係を調査する.
- 抗生物質の活性に関連した構造-活性関係を探求する.
主な方法:
- チオシリン前駆体ペプチドをコードする遺伝子のインビボ操作.
- 65種類の新型チオシリン変種を生成する.
- 構造-活動関係の分析.
主要な成果:
- 65種類の新しいチオシリンの変種を成功裏に生成しました.
- チオシリンの生産と機能における構造-活性関係を探求するためのプラットフォームを確立しました.
- 改善された薬理学プロファイルを持つチオシリンを開発するための基礎を築きました.
結論:
- ティオシリン前駆体ペプチド遺伝子のエンジニアリングは,多様な変異を生成するための実行可能な戦略です.
- 構造-活性関係を理解することは,薬理学的な限界を克服するために非常に重要です.
- このアプローチは,チオシリンベースの治療薬の将来の開発に期待を寄せている.
関連する概念動画
Production of Pharmaceuticals
Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...
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...
Gram-negative Bacterial Protein Secretion Systems
Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
Transgenic Plants
Recombinant DNA technology called transgenesis is often used to add a foreign gene or remove a detrimental gene from an organism. Such genetically modified organisms are called transgenic organisms.
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...
CRISPR and crRNAs
Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
Production of Antibiotics
Penicillin, one of the earliest and most widely used antibiotics, is produced industrially by the filamentous fungus Penicillium chrysogenum. Large stirred-tank bioreactors ranging from tens to hundreds of thousands of liters maintain tightly controlled temperature, pH, and dissolved oxygen conditions to support fungal metabolism and maximize antibiotic yield. Penicillin is a secondary metabolite, synthesized primarily during the stationary growth phase, which requires a carefully managed...


