1887

Abstract

The discovery of new antibiotics and other bioactive microbial metabolites continues to be an important objective in new drug research. Since extensive screening has led to the discovery of thousands of bioactive microbial molecules, new approaches must be taken in order to reduce the probability of rediscovering known compounds. The authors have recently isolated slow-growing acidophiles belonging to the novel genera and within the order . These strains, which likely belong to a new suborder, grow as filamentous mycelia, have a genome size around 8 Mb, and produce antimicrobial activities. In addition, a single strain harbours simultaneously genes encoding type I and type II polyeketide synthases, as well as non-ribosomal peptide synthetases. The metabolite produced by one strain was identified as a previously reported dimeric isochromanequinone. In addition, at least the strains appear globally distributed, since a PCR-specific signal could be detected in a significant fraction of acidic soils from different continents, and similar strains have been independently isolated from an Australian soil ( Jospeh , , 7210–7215, 2003 ). Thus, these previously uncultured actinomycetes share several features with and related antibiotic-producing genera, and represent a promising source of novel antibiotics.

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2006-03-01
2019-11-21
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