Thiol-stimulated secretion of riboflavin and porphyrins by Escherichia coli |
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Authors: | George T Javor |
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Institution: | Institut National de la Recherche Agronomique, Laboratoire de Recherches de Technologie Laitière, 35042 Rennes, France;Institut National de la Santéet de la Recherche Médicale, Laboratoire de Biochimie Médicale B, Facultéde Médicine, 35043 Rennes, France |
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Abstract: | Abstract Streptococcus lactis strain IL594 contains 9 plasmids, designated pIL1 to pIL9. On the basis of protoplast-induced curing experiments we showed that derivatives containing pIL7 (31 kb) were resistant to UV-irradiation while derivatives lacking pIL7 were sensitive. The pIL7-determined UV-protection was confirmed by cotransfer of the plasmid and of the character into a plasmid-free derivative of S. lactis IL594. Moreover, prophage induction required higher UV-fluence in this derivative carrying pIL7 than in the plasmid-free strain. This is the first report of a plasmid-mediated UV-protection in group N streptococci. |
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Keywords: | Group N streptococci UV resistance prophage induction |
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