論文 - 詳細
| RRC ID | 35486 |
|---|---|
| 著者 | Xiao Y, Gerth K, Müller R, Wall D. |
| タイトル | Myxobacterium-produced antibiotic TA (myxovirescin) inhibits type II signal peptidase. |
| ジャーナル | Antimicrob Agents Chemother |
| Abstract |
Antibiotic TA is a macrocyclic secondary metabolite produced by myxobacteria that has broad-spectrum bactericidal activity. The structure of TA is unique, and its molecular target is unknown. Here, we sought to elucidate TA's mode of action (MOA) through two parallel genetic approaches. First, chromosomal Escherichia coli TA-resistant mutants were isolated. One mutant that showed specific resistance toward TA was mapped and resulted from an IS4 insertion in the lpp gene, which encodes an abundant outer membrane (Braun's) lipoprotein. In a second approach, the comprehensive E. coli ASKA plasmid library was screened for overexpressing clones that conferred TA(r). This effort resulted in the isolation of the lspA gene, which encodes the type II signal peptidase that cleaves signal sequences from prolipoproteins. In whole cells, TA was shown to inhibit Lpp prolipoprotein processing, similar to the known LspA inhibitor globomycin. Based on genetic evidence and prior globomycin studies, a block in Lpp expression or prevention of Lpp covalent cell wall attachment confers TA(r) by alleviating a toxic buildup of mislocalized pro-Lpp. Taken together, these data argue that LspA is the molecular target of TA. Strikingly, the giant ta biosynthetic gene cluster encodes two lspA paralogs that we hypothesize play a role in producer strain resistance. |
| 巻・号 | 56(4) |
| ページ | 2014-21 |
| 公開日 | 2012-4-1 |
| DOI | 10.1128/AAC.06148-11 |
| PII | AAC.06148-11 |
| PMID | 22232277 |
| PMC | PMC3318312 |
| MeSH | Anti-Bacterial Agents / biosynthesis Anti-Bacterial Agents / pharmacology* Aspartic Acid Endopeptidases / antagonists & inhibitors* Aspartic Acid Endopeptidases / genetics Bacterial Proteins / antagonists & inhibitors* Bacterial Proteins / genetics Chromosome Mapping Chromosomes, Bacterial / drug effects Chromosomes, Bacterial / genetics Dose-Response Relationship, Drug Drug Resistance, Bacterial / genetics Escherichia coli / drug effects Macrolides / pharmacology* Microbial Sensitivity Tests Microscopy, Fluorescence Mutagenesis Myxococcus xanthus / metabolism* Peptides / pharmacology Plasmids / genetics Protease Inhibitors / pharmacology* Protein Biosynthesis / drug effects |
| IF | 4.904 |
| 引用数 | 38 |
| WOS 分野 | PHARMACOLOGY & PHARMACY MICROBIOLOGY |
| オルトメトリクス指標 |
オルトメトリクス指標項目
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| 各媒体での言及数の合計 | 0 |
| 過去6か月間でのオルトメトリクス指標の変動値 | 0.0 |
| リソース情報 | |
| 原核生物(大腸菌) | JW0025(ASKA lspA) ASKA library |