Antonie van Leeuwenhoek

, Volume 98, Issue 2, pp 225–236

The complex whiJ locus mediates environmentally sensitive repression of development of Streptomyces coelicolor A3(2)

Authors

  • José A. Aínsa
    • Department of Molecular MicrobiologyJohn Innes Centre, Norwich Research Park, Colney
    • Departamento de Microbiología, Facultad de MedicinaUniversidad de Zaragoza
  • Nick Bird
    • Department of Molecular MicrobiologyJohn Innes Centre, Norwich Research Park, Colney
  • N. Jamie Ryding
    • Department of Molecular MicrobiologyJohn Innes Centre, Norwich Research Park, Colney
    • Verenium Corporation
  • Kim C. Findlay
    • Department of Molecular MicrobiologyJohn Innes Centre, Norwich Research Park, Colney
    • Department of Molecular MicrobiologyJohn Innes Centre, Norwich Research Park, Colney
Original Paper

DOI: 10.1007/s10482-010-9443-3

Cite this article as:
Aínsa, J.A., Bird, N., Ryding, N.J. et al. Antonie van Leeuwenhoek (2010) 98: 225. doi:10.1007/s10482-010-9443-3

Abstract

A segment of DNA was isolated that complemented several poorly characterised sporulation-defective white-colony mutants of Streptomyces coelicolor A3(2) from an early collection (Hopwood et al., J Gen Microbiol 61: 397–408, 1970). Complementation was attributable to a gene, SCO4543, named whiJ, encoding a likely DNA-binding protein. Surprisingly, although some mutations in whiJ had a white colony phenotype, complete deletion of the wild-type or mutant gene gave a wild-type morphology. The whiJ gene is a member of a large paralogous set of S. coelicolor genes including abaAorfA, which regulates antibiotic production; and genes flanking whiJ are paralogues of other gene classes that are often associated with whiJ-like genes (Gehring et al., Proc Natl Acad Sci USA 97: 9642–9647, 2000). Thus, the small gene SCO4542 encodes a paralogue of the abaAorfD gene product, and SCO4544 encodes a paralogue of a family of likely anti-sigma factors (including the product of abaAorfB). Deletion of SCO4542 resulted in a medium-dependent bald- or white-colony phenotype, which could be completely suppressed by the simultaneous deletion of whiJ. A model is proposed in which WhiJ binds to operator sequences to repress developmental genes, with repression being released by interaction with the WhiJ-associated SCO4542 protein. It is suggested that this activity of SCO4542 protein is prevented by an unknown signal.

Keywords

whi mutantsStreptomyces coelicolorMicrobial developmentRegulation of secondary metabolismXRE familyAnti-sigma factors

Copyright information

© Springer Science+Business Media B.V. 2010