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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 244 (1994), S. 135-143 
    ISSN: 1617-4623
    Keywords: Streptomyces coelicolor A3(2) ; Glucose kinase ; Glucose repression ; Agarase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The glucose kinase gene (glkA-ORF3) of Streptomyces coelicolor A3(2) plays an essential role in glucose utilisation and in glucose repression of a variety of genes involved in the utilisation of alternative carbon sources. These genes include dagA, which encodes an extracellular agarase that permits agar utilisation. Suppressor mutants of glkA-ORF3 deletion strains capable of utilising glucose (Glc+) arise at a frequency of about 10−5 on prolonged incubation. The Glc+ phenotype of the mutants is reversible (at a frequency of about 10−3) and reflects either the activation of a normally silent glucose kinase gene or the modification of an existing sugar kinase. Although the level of glucose kinase activity in the Glc+ supressor mutants is similar to that in the glkA + parental strain, glucose repression of dagA remains defective. Expression of the glucose kinase gene of Zymomonas mobilis in glkA-ORF3 mutants restored glucose utilisation, but not glucose repression of dagA. Over-expression of glkA-ORF3 on a high-copy-number plasmid failed to restore glucose repression of dagA in glkA-ORF3 mutants and led to loss of glucose repression of dagA in a glkA + strain. These results suggest that glucose phosphorylation itself is not sufficient for glucose repression and that glkA-ORF3 plays a specific regulatory role in triggering glucose repression in S. coelicolor A3(2).
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 211 (1988), S. 191-196 
    ISSN: 1617-4623
    Keywords: Streptomyces coelicolor ; Ribosomal RNA genes ; Streptomyces lividans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Using Southern hybridisation of radiolabelled purified ribosomal RNAs to genomic DNA the ribosomal RNA genes of Streptomyces coelicolor A3(2) were shown to be present in six gene sets. Each gene set contains at least one copy of the 5 S, 16 S and 23 S sequences and in at least two cases these are arranged in the order 16 S-23S-5S. Three gene sets, rrnB, rrnD and rrnF, were isolated by screening a λ library of S. coelicolor A3(2) DNA. The restriction map of one of these, rrnD, was determined and the nucleotide sequences corresponding to the three rRNAs were localised by Southern hybridisation. The gene order in rrnD is 16S-23S-5S.
    Type of Medium: Electronic Resource
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