Abstract
Streptomyces sp A21 is a cellulolytic strain isolated from soil which was assigned to the genus Streptomyces on the basis of distinctive morphological features. A genomic library of A21 DNA has been constructed and transformed into Escherichia coli K-12 using a high-copy-number vector. One of the recombinant plasmids activates the cryptic bgl operon when inserted into appropriate strains. The complete sequence of the 1629-bp A21 DNA fragment has been determined. The analysis revealed the presence of an ORF whose putative product shows a high degree of similarity to RNA polymerase sigma factors; we therefore designated the gene psfS (Putative sigma factor, S treptomyces). Mapping of the 5′ terminus of transcript by primer extension indicated that PsfS induces transcription initiation within the bgl promoter-silencer region.
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Received: 10 February 1998 / Accepted: 23 November 1998
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Marri, L., Daly, S., Perito, B. et al. A putative sigma factor from Streptomyces sp. strain A21 can activate the expression of the cryptic operon bgl in Escherichia coli K-12. Mol Gen Genet 261, 201–207 (1999). https://doi.org/10.1007/s004380050958
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DOI: https://doi.org/10.1007/s004380050958