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J Bacteriol. 1990 September; 172(9): 4790-4797

research-article

Physical analysis and mapping of the Mycoplasma pneumoniae chromosome.

Department of Microbiology, University of Georgia, Athens 30602.

ABSTRACT

Field inversion gel electrophoresis was used for analysis of the chromosome of Mycoplasma pneumoniae. The restriction endonuclease SfiI (5'-GGCCNNNNNGGCC-3') generated 2 M. pneumoniae DNA fragments of approximately 437 and 357.5 kilobase pairs (kbp), whereas 13 restriction fragments ranging in size from 2.4 to 252.0 kbp resulted from digestion with ApaI (5'-GGGCCC-3'). Totaling the sizes of the individual restriction fragments from digestion with SfiI or ApaI yielded a genome size of 794.5 or 775.4 kbp, respectively. A physical map of the M. pneumoniae chromosome was constructed by using a combination of techniques that included analysis by sequential or partial restriction endonuclease digestions and use as hybridization probes of cloned M. pneumoniae DNA containing ApaI sites and hence overlapping adjacent ApaI fragments. Genetic loci for deoC, rrn, hmw3, and the P1 gene were identified by using cloned DNA to probe ApaI restriction fragment profiles.

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