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Bacteriocin production in three strains was plasmid encoded as shown by conjugal transfer and by analysis of cured, bacteriocin-negative derivatives of the donor strains and the transconjugants. With Streptococcus cremoris strains 9B4 and 4G6 and S. lactis subsp. diacetylactis 6F7 as donors, bacteriocin-producing transconjugants were isolated with frequencies ranging from ca. 2 X 10(-2) to 2 X 10(-1) per recipient cell. Bacteriocin-producing transconjugants had acquired a 39.6-megadalton plasmid from the donor strains 9B4 and 4G6, and a 75-megadalton plasmid from the donor strain 6F7. As shown by restriction endonuclease analysis, the plasmids from strains 9B4 and 4G6 were almost identical. The plasmid from strain 6F7 yielded some additional fragments not present in the two other plasmids. In hybridization experiments any of the three plasmids strongly hybridized with each other and with some other bacteriocin but nontransmissible plasmids from other S. cremoris strains. Homology was also detected to a variety of cryptic plasmids in lactic acid streptococci.<\/jats:p>","DOI":"10.1128\/jb.157.3.833-838.1984","type":"journal-article","created":{"date-parts":[[2020,1,3]],"date-time":"2020-01-03T17:55:57Z","timestamp":1578074157000},"page":"833-838","update-policy":"http:\/\/dx.doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":104,"title":["Conjugal transfer and characterization of bacteriocin plasmids in group N (lactic acid) streptococci"],"prefix":"10.1128","volume":"157","author":[{"given":"H","family":"Neve","sequence":"first","affiliation":[]},{"given":"A","family":"Geis","sequence":"additional","affiliation":[]},{"given":"M","family":"Teuber","sequence":"additional","affiliation":[]}],"member":"235","reference":[{"key":"p_1","doi-asserted-by":"crossref","unstructured":"Brandis H. 1978. Bacteriocins of streptococci and bacteriocin typing p. 221-239. In T. Bergan and J. R. Norris (ed.) 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