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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Corre, Christophe Aigle, Bertrand Huang, Sheng Leblond, Pierre Song, Lijiang Laureti, Luisa Challis, Gregory L. |
| Description | Author Affiliation: Laureti L ( Unité Mixte de Recherche1128 Génétique et Microbiologie, Université Henri Poincaré, Institut Fédératif de Recherche 110 EFABA, F-54506 VandÅ uvre-lès-Nancy, France.); |
| Abstract | There is a constant need for new and improved drugs to combat infectious diseases, cancer, and other major life-threatening conditions. The recent development of genomics-guided approaches for novel natural product discovery has stimulated renewed interest in the search for natural product-based drugs. Genome sequence analysis of Streptomyces ambofaciens ATCC23877 has revealed numerous secondary metabolite biosynthetic gene clusters, including a giant type I modular polyketide synthase (PKS) gene cluster, which is composed of 25 genes (nine of which encode PKSs) and spans almost 150 kb, making it one of the largest polyketide biosynthetic gene clusters described to date. The metabolic product(s) of this gene cluster are unknown, and transcriptional analyses showed that it is not expressed under laboratory growth conditions. The constitutive expression of a regulatory gene within the cluster, encoding a protein that is similar to Large ATP binding of the LuxR (LAL) family proteins, triggered the expression of the biosynthetic genes. This led to the identification of four 51-membered glycosylated macrolides, named stambomycins A-D as metabolic products of the gene cluster. The structures of these compounds imply several interesting biosynthetic features, including incorporation of unusual extender units into the polyketide chain and in trans hydroxylation of the growing polyketide chain to provide the hydroxyl group for macrolide formation. Interestingly, the stambomycins possess promising antiproliferative activity against human cancer cell lines. Database searches identify genes encoding LAL regulators within numerous cryptic biosynthetic gene clusters in actinomycete genomes, suggesting that constitutive expression of such pathway-specific activators represents a powerful approach for novel bioactive natural product discovery. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 15 |
| Volume Number | 108 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2011-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Macrolides Chemistry Pharmacology Polyketide Synthases Genetics Streptomyces Cell Line, Tumor Cell Proliferation Drug Effects Gene Silencing Metabolism Multigene Family Enzymology Transcriptional Activation Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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