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. 1991 Nov;173(22):7351–7360. doi: 10.1128/jb.173.22.7351-7360.1991

Identification and cloning of the glnR locus, which is required for transcription of the glnA gene in Streptomyces coelicolor A3(2).

L V Wray Jr 1, M R Atkinson 1, S H Fisher 1
PMCID: PMC209244  PMID: 1718946

Abstract

Six Streptomyces coelicolor mutants that required glutamine for growth at the wild-type rate on all nitrogen sources (Gln-) were isolated. The phenotypes of all six mutants were similar. The glutamine synthetase (GS) levels were 20- to 100-fold lower in extracts of the Gln- mutants than in extracts of their parents. The reduced levels of GS activity in the Gln- mutants were not due to adenylylation of the GS protein, because GS activity in Gln- extracts did not increase after snake venom phosphodiesterase treatment. No transcripts of the GS structural gene (glnA) could be detected in RNA isolated from the Gln- mutants in primer extension experiments. All six gln mutations mapped adjacent to adeA. S. coelicolor chromosomal DNA complementing the Gln- mutants was isolated from a library of S. coelicolor chromosomal DNA constructed in the low-copy-number S. coelicolor plasmid pIJ922. Subcloning experiments showed that a 1.45-kb DNA fragment could complement all six Gln- mutants. This DNA fragment did not hybridize with either the cloned S. coelicolor glnA gene or the cloned S. viridochromogenes GSII gene in Southern blots. Since glnA transcription was restored in the Gln- mutants containing the complementing DNA, the gln mutations appear to lie in one or more closely linked genes that are required for glnA transcription in S. coelicolor.

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