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Journal of Bacteriology, September 2006, p. 6411-6414, Vol. 188, No. 17
0021-9193/06/$08.00+0     doi:10.1128/JB.00716-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Blue Light Activates the ^B-Dependent Stress Response of Bacillus subtilis via YtvA

Department of Molecular Microbial Physiology, Swammerdam Institute for Life Sciences, Faculty of Science, University of Amsterdam, Nieuwe Achtergracht 166, 1018WV Amsterdam, The Netherlands

Received 18 May 2006/ Accepted 9 June 2006

Here we present evidence for a physiologically relevant light response mediated by the LOV domain-containing protein YtvA in the soil bacterium Bacillus subtilis. The loss and overproduction of YtvA abolish and enhance, respectively, the increase in ^B-controlled ctc promoter activity at moderate light intensities. These effects were absent in the dark and in red light but present under blue-light illumination. Thus, activation of the general stress response in B. subtilis is modulated by blue light.

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