Summary
A number of deletions in the glucose kinase (glk) region of the Streptomyces coelicolor chromosome were found among spontaneous glk mutants. The deletions were identified by probing Southern blots of chromosomal DNA from glk mutants with cloned glk DNA. The deletions ranged in size from 0.3 kb to greater than 2.9 kb. When cloned glk DNA was introduced on a ϕC31 phage vector into a glk mutant that contained a deletion of the entire homolgous chromosomal glk region, glucose kinase activity was detected in extracts of these cells. The entire coding information for at least a subunit of glucose kinase is there-fore present on the cloned glk DNA. The 0.3 kb glk chromosomal deletion was used to demonstrate that transfer of chromosomal glk mutations on the the ϕC31::glk phage could occur by recombination in vivo. Since glk mutations frequently arise from deletion events, a method was devised for inserting the cloned glk DNA at sites in the chromosome for which cloned DNA is available, and thus facilitating the isolation of deletions in those DNA regions. ϕC31::glk vectors containing a deletion of the phage att site cannot lysogenize S. coelicolor recipients containing a deletion of the glk chromosomal gene unless these phages contain S. coelicolor chromosomal DNA. In such lysogens, the glk gene becomes integrated into the chromosome by homologous recombination directed by the chromosomal insert on the phage DNA. In appropriate selective conditions, mutants which contain deletions of the glk gene that extend into the adjacent host DNA can be easily isolated. This method was used to insert glk into the methylenomycin biosynthetic genes, and isolate derivatives with deletions of host DNA from within the prophage into the adjacent host DNA. Phenotypic and Southern blot analysis of the deletions showed that there are no genes essential for methylenomycin biosynthesis for at least 13 kb to the left of a region concerned with negative regulation of methylenomycin biosynthesis. Many of the deletions also removed part of the ϕC31 prophage.
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Fisher, S.H., Bruton, C.J. & Chater, K.F. The glucose kinase gene of Strptomyces coelicolor and its use in selecting spontaneous deletions for desired regions of the genome. Mol Gen Genet 206, 35–44 (1987). https://doi.org/10.1007/BF00326533
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DOI: https://doi.org/10.1007/BF00326533