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Int J Syst Bacteriol 43 (1993), 844-847; DOI 10.1099/00207713-43-4-844
© 1993 Society for General Microbiology
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Characteristics of DNA and Multiple rpoD Homologs of Microcystis(Synechocystis) Strains

TAKUYA SAKAMOTO1, MAKOTO SHIRAI1,*, MUNEHIKO ASAYAMA1, TOKUJIRO AIDA1, AKIO SATO1, KAN TANAKA2, HIDEO TAKAHASHI2 and MASAYASU NAKANO3

1 Division of Biotechnology, Ibaraki University, Ami, Ibaraki 300-03, Japan
2 Institute of Applied Microbiology, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
3 Department of Microbiology, Jichi Medical School, Yakushiji, Tochigi 329-04, Japan

* Corresponding author.

ABSTRACT

The base compositions of DNAs from nine Microcystis strains, as determined by high-performance liquid chromatography, were 41 to 42 mol% G+C. Chromosomal DNAs derived from these strains were found to be extremely resistant to many restriction endonucleases, and a restriction analysis revealed the presence of a dam-like methylase or both dam- and dcm-like methylases in all of the strains examined. Genomic Southern hybridization in which a synthetic oligonucleotide probe (rpoD probe) was used showed that members of the genus Microcystis might have multiple rpoD homologs, and the hybridization signal patterns observed with the DNAs of Microcystis aeruginosa strains were different from each other.




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Copyright © 1993 by the International Union of Microbiological Societies.