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Infection and Immunity, July 2003, p. 3954-3959, Vol. 71, No. 7
0019-9567/03/$08.00+0 DOI: 10.1128/IAI.71.7.3954-3959.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.
Macrophage-Mediated Germination of Bacillus anthracis Endospores Requires the gerH Operon
Matthew A. Weiner and Philip C. Hanna*
Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan
Received 31 January 2003/
Returned for modification 25 March 2003/
Accepted 11 April 2003
The gerHABC operon of Bacillus anthracis, encoding a gerA-like family member of germinant sensors, was shown to be required for endospore germination in the presence of macrophages and in macrophage-conditioned media. The loss of the germination phenotype in macrophage cultures of B. anthracis gerH-null endospores was restored by complementation in trans with a wild-type copy of gerH expressed under the control of its own promoter. Using endospores from both the parental strain B. anthracis Sterne and an isogenic gerH-null strain, we partially characterized germinants secreted by macrophages into the extracellular medium.
* Corresponding author. Mailing address: Department of Microbiology and Immunology, University of Michigan Medical School, 5641 Med. Sci. II, Box 0620, Ann Arbor, MI 48104. Phone: (734) 615-3706. Fax: (734) 764-3562. E-mail:
pchanna{at}umich.edu.
Editor: D. L. Burns
Infection and Immunity, July 2003, p. 3954-3959, Vol. 71, No. 7
0019-9567/03/$08.00+0 DOI: 10.1128/IAI.71.7.3954-3959.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.
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