Actinoplanes philippinensis MA7347から発見されたチアゾリルペプチドであるフィリピマイシンの分離,構造,および抗菌活性
Chaowei Zhang1, James Occi, Prakash Masurekar
1Merck Research Laboratories, Rahway, New Jersey 07065, USA.
Journal of the American Chemical Society
|August 14, 2008
まとめ
研究者らは,新しいチアゾリルペプチドグリコシド抗生物質であるフィリピマイシンを発見し,MRSAのような耐薬細菌に対して有効であった. この新しい抗生物質は,細菌のタンパク質合成を標的とし,インビヴォでは有望であり,抗生物質耐性に対する潜在的な新兵器を提供している.
科学分野:
- 微生物学と天然製品化学について
- 薬物の発見と開発
背景:
- 抗生物質耐性,特に多剤耐性菌株に対する抗生物質耐性は,世界的な健康上の重大な懸念事項である.
- 新しい作用機構を持つ新しい抗生物質が緊急に必要とされています.
- シアゾリルペプチドは強力な抗生物質ですが,しばしば薬剤的性質が悪くなります.
研究 の 目的:
- 潜在的に改善された性質を持つ新しいチアゾリルペプチドを発見する.
- 耐性菌株に対して有効な新種の抗生物質を特定する.
主な方法:
- Staphylococcus aureus菌株を用いた特定の測定法の開発.
- 化合物の分離のためのバイオアッセイ誘導分離.
- 先進的なスペクトロスコピー技術 (2D NMR,HRESIFT-MS/MS) を用いた構造解明.
- インビトロおよびインビボの抗菌活性試験.
- タンパク質合成阻害およびドッキング研究を含む作用メカニズムの研究.
主要な成果:
- 新しいチアゾリルペプチドグリコシドであるフィリピミシンとその分解産物の発見と分離.
- この2つの化合物は,メチシリン耐性黄金球菌 (MRSA) を含む,グラム陽性細菌に対する強力な活性を示し,MICは0.015から1μg/mLであった.
- フィリピマイシンは,分解産物と比較して優れた効能を示した.
- タンパク質合成の選択的阻害が観察され,リボソームを標的としたことを示した.
- フィリピマイシンは,S. aureus感染のマウスモデルで有効性を示した (ED50 = 8.4 mg/kg).
- ドッキング研究は,リボソームとL11タンパク質との相互作用に関する洞察を提供し,耐性菌株に対する差異的活性を説明しました.
結論:
- フィリピマイシンは,MRSAを含むグラム陽性細菌に対する強力な活性を持つ有望な新しいチアゾリルペプチド抗生物質です.
- タンパク質合成を標的とするその新しいメカニズムと in vivo で実証された有効性は,さらなる調査を正当化します.
- リボソームと耐性メカニズムとの相互作用を理解することで,将来の抗生物質開発を導くことができます.
関連する概念動画
Inhibitors of Gram-positive Cell Wall Synthesis
Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...
Antimicrobial Proteins
Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
Inhibitors of Bacterial Protein Synthesis
Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
Bacterial Phylum Actinobacteria
Coryneform bacteria are gram-positive, aerobic, nonmotile rods that exhibit irregular, club-shaped, or V-shaped arrangements. Their V-shape results from snapping division, where the inner cell wall layer forms the cross-wall, while the outer layer remains intact until it ruptures on one side, causing the daughter cells to bend away.The primary genera are Corynebacterium and Arthrobacter. Corynebacterium includes diverse species, ranging from saprophytes to pathogens like Corynebacterium...
iChip
The cultivation of environmental microorganisms has long been hindered by the inability to replicate complex native conditions in vitro. The isolation chip (iChip) addresses this limitation by facilitating the growth of previously uncultivable microorganisms through in situ incubation. Designed for high-throughput microbial cultivation, the iChip comprises hundreds of microchambers, each capable of housing a single microbial cell. These microchambers are loaded with a mixture of molten agar and...
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...


