This report describes the fermentation, isolation, and structural elucidation of tetracenomycin (Tcm) F2 [2], a metabolite produced by a blocked mutant strain WMH1092 of the Tcm C [1] producer Streptomyces glaucescens and by the recombinant strain S. glaucescens WMH1077 (pWHM722). Elucidation of the Tcm F2 structure shows that 2 is the earliest intermediate identified to date in the biosynthesi...

Isolation and structure elucidation of six new divergolides reveal unusual ansamycin diversification reactions including formation of the unusual isobutenyl side chain from a branched polyketide synthase extender unit, azepinone ring closure, macrolide ring contraction and formation of a seco variant by a neighboring group-assisted decarboxylation.

wereport their production, isolation, structure elucidation and biological properties. Strain HIL Y-9065403 was isolated from a soil sample collected in Nainital, India. The strain was identified as belonging to the genus Streptomyces using the methods described by Shirling and Gottlieb2). A loopful of mature slant culture of Streptomyces Y-9065403 was inoculated into Erlenmeyer flasks (500ml c...

The myxobacterial strain Stigmatella aurantiaca MYX-030 was selected as promising source for the discovery of new biologically active natural products by our screening methodology. The isolation, structure elucidation and initial biological evaluation of the myxocoumarins derived from this strain are described in this work. These compounds comprise an unusual structural framework and exhibit re...

The recent state of the knowledge of properties and structure of alpha-amylases is reviewed with the aim of elucidation the basis for their stabilization. Three principal ways for obtaining stable alpha-amylases (isolation of enzymes from extremophiles, production of extremophilic enzymes in mesophiles, and modification of mesophilic enzymes) are discussed separately. Detailed experimental exam...