Learn More
Degenerated oligonucleotide primers were designed to amplify fragments of ketosynthase genes from polyketide antibiotics producing Streptomyces spp. and bacterial strains enriched from soil samples. Cell lysates were used as templates in amplification, so time-consuming DNA purification was avoided. A phylogenetic tree constructed from the amino acid(More)
A 613-bp fragment of an essential ketosynthase gene from the biosynthetic pathway of aromatic polyketide antibiotics was sequenced from 99 actinomycetes isolated from soil. Phylogenetic analysis showed that the isolates clustered into clades that correspond to the various classes of aromatic polyketides. Additionally, sequencing of a 120-bp fragment from(More)
The sno gene cluster in Streptomyces nogalater ATCC 27451 contains the nogalamycin biosynthesis genes. A set of plasmid constructions carrying fragments of the sno cluster that lie downstream of snoD were used to complement the S. galilaeus mutant H039, which is blocked in rhodosamine and 2-deoxyfucose biosynthesis in the aclacinomycin pathway. Sequence(More)
A cluster of anthracycline biosynthetic genes isolated from Streptomyces nogalater was expressed in Streptomyces lividans and in Streptomyces galilaeus. A 12 kb DNA fragment cloned from this cluster in pIJ486 caused the production of a novel compound when introduced into S. lividans. The compound is derived from nogalonic acid methyl ester, an early(More)
Fragments spanning 20 kb of Streptomyces nogalater genomic DNA were characterized to elucidate the molecular genetic basis of the biosynthetic pathway of the anthracycline antibiotic nogalamycin. Structural analysis of the products obtained by expression of the fragments in S. galilaeus and S. peucetius mutants producing aclacinomycin and daunomycin(More)
We have cloned and characterized a gene cluster for anthracycline biosynthesis from Streptomyces galilaeus. This cluster, 15-kb long, includes eight genes involved in the deoxyhexose biosynthesis pathway, a gene for a glycosyltransferase and one for an activator, as well as two genes involved in aglycone biosynthesis. Gene disruption targeted to the(More)
The calcitonin gene-related peptide, CGRP, has potential medicinal use for instance as a vasodilator or in the regulation of bone metabolism. In this study new analogues of CGRP based on molecular modelling of active fragments were synthesised and tested. The analogues were found to have affinities for the receptor comparable to those seen for native CGRP.(More)
A DNA segment cloned from Streptomyces purpurascens ATCC 25489 close to a region that hybridized to a probe containing part of the actinorhodin polyketide synthase caused S. galilaeus ATCC 31615 to produce new anthracyclines. When transformed with certain sub-clones of this segment, the host produced glycosides of epsilon-rhodomycinone, beta-rhodomycinone,(More)
The calcitonin gene-related peptide (CGRP) is a 37 residue neuropeptide which causes vasodilatation, increases heart rate and inhibits bone resorption. These effects make it an interesting lead for drug discovery. We have combined current structural and biological information to model the structure of hCGRP-beta to be used as a basis for the rational design(More)