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Journal of Bacteriology, August 1998, p. 3816-3822, Vol. 180, No. 15
Institute of Hygiene and Infectious Diseases
of Animals, Justus-Liebig-Universität Giessen, D-35392
Giessen, Germany
Received 10 January 1998/Accepted 3 May 1998
Pulsed-field gel electrophoresis and PCR techniques have been used
to construct a NotI macrorestriction map of the obligate intracellular bacterium Coxiella burnetii Nine Mile. The
size of the chromosome has been determined to be 2,103 kb comprising 29 NotI restriction fragments. The average resolution is 72.5 kb, or about 3.5% of the genome. Experimental data support the presence of a linear chromosome. Published genes were localized on the
physical map by Southern hybridization. One gene, recognized as
transposable element, was found to be present in at least nine sites
evenly distributed over the whole chromosome. There is only one copy of
a 16S rRNA gene. The putative oriC has been located on a
27.5-kb NotI fragment. Gene organization upstream the
oriC is almost identical to that of Pseudomonas
putida and Bacillus subtilis, whereas gene
organization downstream the oriC seems to be unique among
bacteria. The physical map will be helpful in investigations of the
great heterogeneity in restriction fragment length polymorphism
patterns of different isolates and the great variation in genome size.
The genetic map will help to determine whether gene order in different
isolates is conserved.
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Physical and Genetic Map of the Obligate
Intracellular Bacterium Coxiella burnetii
*
Corresponding author. Mailing address: Institute of
Hygiene and Infectious Diseases of Animals,
Justus-Liebig-Universität Giessen, Frankfurter Str. 89, D-35392
Giessen, Germany. Phone: (49) 641 99 38308. Fax: (49) 641 99 38309. E-mail: Hermann.Willems{at}vetmed.uni-giessen.de.
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