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J Bacteriol, March 1998, p. 1556-1562, Vol. 180, No. 6
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

The bldB Gene Encodes a Small Protein Required for Morphogenesis, Antibiotic Production, and Catabolite Control in Streptomyces coelicolor

Margaret K. Pope,dagger Brian Green,Dagger and Janet Westpheling*

Genetics Department, University of Georgia, Athens, Georgia 30302

Received 23 September 1997/Accepted 12 January 1998

Mutants blocked at the earliest stage of morphological development in Streptomyces species are called bld mutants. These mutants are pleiotropically defective in the initiation of development, the ability to produce antibiotics, the ability to regulate carbon utilization, and the ability to send and/or respond to extracellular signals. Here we report the identification and partial characterization of a 99-amino-acid open reading frame (ORF99) that is capable of restoring morphogenesis, antibiotic production, and catabolite control to all of the bldB mutants. Of the existing bld mutants, bldB is of special interest because the phenotype of this mutant is the most pleiotropic. DNA sequence analysis of ORF99 from each of the existing bldB mutants identified base changes either within the coding region of the predicted protein or in the regulatory region of the gene. Primer extension analysis identified an apparent transcription start site. A promoter fusion to the xylE reporter gene showed that expression of bldB is apparently temporally regulated and that the bldB gene product is involved in the regulation of its own expression.

* Corresponding author. Mailing address: Genetics Department, University of Georgia, Athens, GA 30302. Phone: (706) 542-1436. Fax: (706) 542-3910. E-mail: westpheling{at}bscr.uga.edu.

dagger Present address: Department of Microbiology, University of British Columbia, Vancouver, B.C., Canada.

Dagger Present address: Diversa Corporation, San Diego, Calif.




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