Abstract
Genes that govern the formation of deoxysugars or their attachment to erythronolide B and 3 alpha-mycarosyl erythronolide B, intermediates of the biosynthesis of the 14-membered macrolide antibiotic erythromycin, were cloned from Saccharopolyspora erythraea (formerly Streptomyces erythreus). Segments of DNA that complement the eryB25, eryB26, eryB46, eryC1-60, and eryD24 mutations blocking the formation of erythronolide B or 3 alpha-mycarosyl erythronolide B, when cloned in Escherichia coli-Streptomyces shuttle cosmids or plasmid vectors that can transform S. erythraea, were located in a ca. 18-kilobase-pair region upstream of the erythromycin resistance (ermE) gene. The eryC1 gene lies just to the 5' side of ermE, and one (or possibly two) eryB gene is approximately 12 kilobase pairs farther upstream. Another eryB gene may be in the same region, while an additional eryB mutation appears to be located elsewhere. The eryD gene lies between the eryB and eryC1 genes and may regulate their function on the basis of the phenotype of an EryD- mutant.
MeSH Terms
Cloning, Molecular
DNA, Bacterial/genetics
Deoxy Sugars/biosynthesis
Drug Resistance, Microbial/genetics
Erythromycin/biosynthesis
Escherichia coli/genetics
Genes, Bacterial
Mutation
Nucleic Acid Hybridization
Plasmids
R Factors
Restriction Mapping
Streptomyces/genetics,metabolism
Transformation, Bacterial
Chemicals
DNA, Bacterial
Deoxy Sugars
Erythromycin
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Vara J
School of Pharmacy, University of Wisconsin, Madison 53706.
Lewandowska-Skarbek M
Wang Y G
Donadio S
Hutchinson C R
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