Open AccessDNA‐DNA hybridization analysis of Streptococcus thermophilus plasmids
Author(s) -
Somkuti George A.,
Steinberg Dennis H.
Publication year - 1991
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.1991.tb04454.x
Subject(s) - streptococcus thermophilus , plasmid , homology (biology) , biology , lactococcus lactis , dna , genetics , dna–dna hybridization , bacteria , lactococcus , streptococcaceae , thermophile , microbiology and biotechnology , gene , lactobacillus , lactic acid
Summary Five of the nine known plasmid DNAs of Streptococcus thermophilus ranging from 2.2 kbp to 14.7 kbp in molecular size, were found to share homologous sequences as evidenced by DNA‐DNA hybridization analyses. The four other S. thermophilus plasmids also lacked homology with one another implying that they may represent unique DNA homology groups. The lack of homology between the S. thermophilus probe (pER8, 2.2 kbp) and plasmids of Lactococcus lactis, L. cremoris and lactobacilli also implied a fundamental difference in the origins of plasmids of thermophilic and mesophilic lactic acid bacteria.