Summary
A non-sporulating mutant (whiB218) of Streptomyces coelicolor A3(2), which proved to contain a deletion of more than 5 kb of DNA including whiB, was complemented by a small cloned DNA fragment, deduced from DNA sequencing* to encode a protein of only 87 amino acids. This protein would bear some similarities to transcription factors, including an acidic, somewhat amphipathic α-helical region predicted near its N-terminus, and a basic α-helical region predicted at its C-terminus. A point mutation (whiB70) giving a phenotype indistinguishable from that of the whiB218 deletion mutant would cause a leucine to proline change at the start of the latter region. The whiB homologue from the closely related species S. lividans differed at only one base from its S. coelicolor counterpart, and would specify an identical polypeptide.
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Communicated by H. Hennecke
The accession number in the EMBL Data Library is X62287
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Davis, N.K., Chater, K.F. The Streptomyces coelicolor whiB gene encodes a small transcription factor-like protein dispensable for growth but essential for sporulation. Molec. Gen. Genet. 232, 351–358 (1992). https://doi.org/10.1007/BF00266237
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DOI: https://doi.org/10.1007/BF00266237