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Journal of Bacteriology, April 2002, p. 2148-2154, Vol. 184, No. 8
0021-9193/02/$04.00+0 DOI: 10.1128/JB.184.8.2148-2154.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
Bacillus subtilis 168 Contains Two Differentially Regulated Genes Encoding L-Asparaginase
Susan H. Fisher* and Lewis V. Wray, Jr.
Department of Microbiology, Boston University School of Medicine, Boston, Massachusetts 02118
Received 27 November 2001/
Accepted 18 January 2002
Expression of the two Bacillus subtilis genes encoding L-asparaginase is controlled by independent regulatory factors. The ansZ gene (formerly yccC) was shown by mutational analysis to encode a functional L-asparaginase, the expression of which is activated during nitrogen-limited growth by the TnrA transcription factor. Gel mobility shift and DNase I footprinting experiments indicate that TnrA regulates ansZ expression by binding to a DNA site located upstream of the ansZ promoter. The expression of the ansA gene, which encodes the second L-asparaginase, was found to be induced by asparagine. The ansA repressor, AnsR, was shown to negatively regulate its own expression.
* Corresponding author. Mailing address: Department of Microbiology, Boston University School of Medicine, 715 Albany St., Boston, MA 02118. Phone: (617) 638-5498. Fax: (617) 638-4286. E-mail:
shfisher{at}bu.edu.
Journal of Bacteriology, April 2002, p. 2148-2154, Vol. 184, No. 8
0021-9193/02/$04.00+0 DOI: 10.1128/JB.184.8.2148-2154.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
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