Comparative analysis of the whole set of rRNA operons between an enterohemorrhagic Escherichia coli O157: H7 Sakai strain and an Escherichia coli K-12 strain MG1655

M. Ohnishi, T. Murata, K. Nakayama, S. Kuhara, Masahira Hattori, K. Kurokawa, T. Yasunaga, K. Yokoyama, K. Makino, H. Shinagawa, T. Hayashi

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13 Citations (Scopus)

Abstract

Two primer sets for direct sequence determination of all seven rRNA operons (rrn) of Escherichia coli have been developed; one is for specific-amplification of each rrn operon and the other is for direct sequencing of the amplified operons. Using these primer sets, we determined the nucleotide sequences of seven rrn operons, including promoter and terminator regions, of an enterohemorrhagic E. coli (EHEC) O157:H7 Sakai strain. To elucidate the intercistronic or intraspecific variation of rrn operons, their sequences were compared with those for the K-12 rrn operons. The rrn genes and the internal transcribed spacer regions showed a higher Similarity to each other in each strain than between the corresponding operons of the two strains. However, the degree of intercistronic homogeneity was much higher in the EHEC strain than in K-12. In contrast, promoter and terminator regions in each operons were conserved between the corresponding operons of the two strains, which exceeded intercistronic similarity.

Original languageEnglish
Pages (from-to)315-324
Number of pages10
JournalSystematic and Applied Microbiology
Volume23
Issue number3
Publication statusPublished - 2000
Externally publishedYes

Keywords

  • Direct sequencing
  • E. coli K-12
  • Enterohemorrhagic E. coli O157:H7
  • Intercistronic variation
  • Intraspecific variation
  • rrn operon

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology

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    Ohnishi, M., Murata, T., Nakayama, K., Kuhara, S., Hattori, M., Kurokawa, K., Yasunaga, T., Yokoyama, K., Makino, K., Shinagawa, H., & Hayashi, T. (2000). Comparative analysis of the whole set of rRNA operons between an enterohemorrhagic Escherichia coli O157: H7 Sakai strain and an Escherichia coli K-12 strain MG1655. Systematic and Applied Microbiology, 23(3), 315-324.