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J. Bacteriol., 12 1997, 7426-7434, Vol 179, No. 23
Copyright © 1997, American Society for Microbiology

Physical and genetic map of the Clostridium acetobutylicum ATCC 824 chromosome

E Cornillot, C Croux and P Soucaille
INSA, Centre de Bioingenierie G. Durand, UMR CNRS 5504, Laboratoire associe INRA, Toulouse, France.

A physical and genetic map of the Clostridium acetobutylicum ATCC 824 chromosome was constructed. The macrorestriction map for CeuI, EagI, and SstII was created by ordering the 38 restriction sites by one- and two-dimensional pulsed-field gel electrophoresis (PFGE) and by using an original strategy based on the CeuI enzyme and indirect end labelling by hybridization on both sides of the CeuI sites with rrs (16S RNA) and 3' rrl (23S RNA) probes. The circular chromosome was estimated to be 4.15 Mb in size, and the average resolution of the physical map is 110 kb. The chromosome contains 11 rrn loci, which are localized on 44% of the chromosome in a divergent transcriptional orientation regarding the presumed location of the replication origin. In addition to these 11 rrn operons, a total of 40 identified genes were mapped by hybridization experiments with genes from C. acetobutylicum and from various other clostridia as probes. The genetic map of C. acetobutylicum was compared to that of the three other endospore- forming bacteria characterized so far: Bacillus subtilis, Clostridium beijerinckii, and Clostridium perfringens. Parodoxically, the chromosomal backbone of C. acetobutylicum showed more similarity to that of B. subtilis than to those of the clostridia.

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