Discovery of platencin, a dual FabF and FabH inhibitor with in vivo antibiotic properties.
Proc Natl Acad Sci U S A
; 104(18): 7612-6, 2007 May 01.
Article
em En
| MEDLINE
| ID: mdl-17456595
ABSTRACT
Emergence of bacterial resistance is a major issue for all classes of antibiotics; therefore, the identification of new classes is critically needed. Recently we reported the discovery of platensimycin by screening natural product extracts using a target-based whole-cell strategy with antisense silencing technology in concert with cell free biochemical validations. Continued screening efforts led to the discovery of platencin, a novel natural product that is chemically and biologically related but different from platensimycin. Platencin exhibits a broad-spectrum Gram-positive antibacterial activity through inhibition of fatty acid biosynthesis. It does not exhibit cross-resistance to key antibiotic resistant strains tested, including methicillin-resistant Staphylococcus aureus, vancomycin-intermediate S. aureus, and vancomycin-resistant Enterococci. Platencin shows potent in vivo efficacy without any observed toxicity. It targets two essential proteins, beta-ketoacyl-[acyl carrier protein (ACP)] synthase II (FabF) and III (FabH) with IC50 values of 1.95 and 3.91 microg/ml, respectively, whereas platensimycin targets only FabF (IC50 = 0.13 microg/ml) in S. aureus, emphasizing the fact that more antibiotics with novel structures and new modes of action can be discovered by using this antisense differential sensitivity whole-cell screening paradigm.
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Base de dados:
MEDLINE
Assunto principal:
3-Oxoacil-(Proteína de Transporte de Acila) Sintase
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Compostos Policíclicos
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Inibidores Enzimáticos
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Aminofenóis
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Antibacterianos
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article