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Echosides, isolated from Streptomyces sp. LZ35, represent a class of para-terphenyl natural products that display DNA topoisomerase I and IIα inhibitory activities. By analyzing the genome draft of strain LZ35, the ech gene cluster was identified to be responsible for the biosynthesis of echosides, which was further confirmed by gene disruption and HPLC analysis. Meanwhile, the biosynthetic pathway...
Divergolides are a group of structurally unprecedented ansamacrolactam antibiotics with antibacterial and antitumor activities. A biosynthetic gene cluster predicted to encode the biosynthesis of divergolides was cloned and sequenced from endophytic Streptomyces sp. W112. The gene cluster of divergolides (div) spans a DNA region of 61-kb and consists of 20 open reading frames (ORFs) that encode polyketide...
Mycobacterium tuberculosis (M.tb) is a successful human pathogen and widely prevalent throughout the world. Genomic islands (GIs) are thought to be related to pathogenicity. In this study, we predicted two potential genomic islands in M.tb genome, respectively named as GI-1 and GI-2. It is indicated that the genes belong to PE_PGRS family in GI-1 and genes involved in sulfolipid-1 (SL-1) synthesis...
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