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All analyses were performed in duplicate on triplicate samples, resulting in six replicate analyses per treatment. Results were averaged and compared to either INT-407 cells http://www.selleckchem.com/products/PLX-4032.html with untreated 81-176, INT-407 cells with acetonitrile treated 81-176 and INT-407 cells inoculated with each treatment only. Statistical analysis was performed using the SigmaStat statistical analysis program. Many bacteria utilize cell-to-cell-signalling as a means to enhance survival and pathogenicity. However, this signalling has not been investigated to date in Camp.?jejuni. Known luxI and ainS sequences from other strains shown to possess these genes or homologues were compared to the sequenced genome of Camp.?jejuni RM1221 and NCTC 11168 (GenBank accession numbers NC_003912 and NC_002163, respectively) for homologous sequences. No homology to these known AI-1 synthases was detected. Despite the negative findings of BLASTN http://www.selleckchem.com/products/AZD2281(Olaparib).html searches against other known synthases, this finding was not considered to be a definitive result, as despite certain conserved regions, luxI homologues are reported to share low sequence similarity, often no higher than 35% pairwise identity (Fuqua et?al. 1996). The CFS of two Camp.?jejuni strains (81-176 and cj11) were subjected to seven AI-1 biosensor assays investigating the presence of a range of acyl homoserine lactones, including acyl side chains of varying length (from 4 to 16 carbon chains), saturation and substitution (data not shown). The CFS of the two Camp.?jejuni strains induced a positive http://www.selleck.cn/products/BEZ235.html response only from the V.?harveyi BB886 sensor (Fig.?1a). This result indicated that the HSL produced was an N-(3-hydroxy-butanoyl)-l-HSL (3-OH-C4-HSL; see Table?1) or a compound of similar structure or active sites. Separations of ethyl acetate CFS extractions were performed using reverse-phase HPLC. The eluted fraction was collected based on the retention time of the 3-OH-C4-HSL standard (c.?7��59?min; Fig.?2). The positive control V.?harveyi BB886 and Camp.?jejuni strains 81-176 and cj11 had similar peaks at 7��00, 7��47 and 7��66?min, respectively. The activity of the fraction was subjected to the V.?harveyi BB886 HSL assay to determine if activity was retained (data not shown). The RLUs of the Camp.?jejuni fractions were compared to the positive control BB886 fraction and expressed as a percentage of this positive control, resulting in RLU of 25% and 10% for 81-176 and cj11, respectively. While a decrease in RLU percentage was noted, this phenomenon still indicated a positive reaction inferring the presence of 3-OH-C4-HSL or molecules with similar structures, as the negative control, V.?harveyi BB152, gave