Nucleic Acids Res 2002, 30:e36.CrossRefPubMed Authors’ contributions CL participated in the study design, carried out the microbiological studies and helped to draft the manuscript. AC carried out the microbiological studies. SL conceived RGFP966 supplier of the study, participated in the study design, carried out the microbiological studies, performed the statistical analysis and drafted the manuscript. All authors read and approved the final manuscript..”
“Background Pectobacterium carotovorum subsp. carotovorum is a phytopathogenic enterobacterium responsible for soft rot, a disease characterized by extensive plant tissue maceration caused by a variety of secreted enzymes. The major pathogeniCity determinants
are an arsenal of extracellular pectinases, including several pectate lyase isozymes:
pectin lyase, pectin methylesterase, and pectin polygalacturonase. In addition, a range of other degradative enzymes, such as cellulase and proteases, play equivocal roles in virulence [1]. Pectobacterium carotovorum subsp. carotovorum also produces one or more antibacterial substances called bacteriocins, which enhance their competitiveness with other related rival species [2]. The ability of this bacterial species to produce Vactosertib concentration bacteriocin has been exploited in many biological PLX-4720 clinical trial control programs for the soft-rot disease of Chinese cabbage [3–5]. In view of this, identification and cloning of the gene(s) controlling bacteriocin
production may facilitate the development of wider and more innovative control methods, such as the cloning of these gene(s) into Chinese cabbage, tobacco, and other susceptible plants to produce resistant cultivars. In our previous paper, the brg gene was found to encode a regulator required for the expression of the low-molecular-weight bacteriocin (LMWB) in a strain of Pectobacterium carotovorum subsp. carotovorum [1]. The gene is homologous to hfq and encodes a protein with similar functions [1, 6]. The genetic determinant encoding LMWB synthesis was designated the Carocin S1 genetic determinant, which consists of two structural genes, caroS1K (encoding killer protein) and caroS1I (immunity protein). Clear zones Liothyronine Sodium of inhibition around CaroS1K producer colonies are due to CaroS1K antibiotic activity. Carocin S1-associated nuclease activity has also been demonstrated [7]. The carocin S1 gene has been isolated from Pectobacterium carotovorum subsp. carotovorum 89-H-4 and functionally expressed after introduction into Pectobacterium carotovorum subsp. carotovorum Ea1068a (a non-bacteriocin-producing strain). From our previous studies, glucose, as well as SOS agents, can also induce the carocin S1 gene. Using the same Carocin S1-producing strain of Pectobacterium carotovorum subsp. carotovorum, genes controlling the LMWB have been cloned and sequenced, and homology to the flhD/C operon demonstrated.