Abstract
Nukacin 3299 (formerly designated simulancin 3299), produced by a Staphylococcus simulans strain involved in bovine mastitis in Brazil, is the first peptide bacteriocin described in this staphylococcal species. With the intent to elucidate some aspects of its biology, nukacin 3299 was purified and characterized. The mass of the purified bacteriocin was shown to be 2957.3 Da, and the peptide N-terminal amino acids (KKKSGVI) were identified by Edman degradation. The nukacin 3299 structural gene, nukA, was detected by PCR and DNA sequencing, showing that this bacteriocin is identical to nukacin ISK-1, a 27-amino acid type-A (II) lantibiotic produced by Staphylococcus warneri ISK-1, isolated from a "nukadoko", in Japan. The genes involved in nukacin 3299 biosynthesis are located on plasmid pRJ97 (>27 kb). They have an organization similar to that of the nukacin ISK-1 gene cluster, excepted for the presence of an IS257/431 element (791 bp) present between the orf1 and nukA genes of the nukacin 3299 gene cluster. The presence of this insertion sequence is expected to affect the expression of orf1, whose function is presently unknown. Nukacin 3299 proved to be sensitive to proteolytic enzymes and relatively stable at different tempera...Continue Reading
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