• 한국식품과학회지
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• 제52권6호
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• pp.670-677
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• 2020

본 연구에서는 가장 빈번하게 발생하는 세균성 식중독의 원인균인 C. jejuni의 주 감염원인 계육에 대하여, 식품공전에 등재된 식품첨가물 중 유화제를 이용하여 계육에서 C. jejuni의 부착을 제어 할 수 있는 기술을 확보하고자 하였다. 8종의 유화제를 200 mg/mL의 농도에서 paper disc agar diffusion method로 C. jejuni에 대한 항균활성을 검색한 결과 L-7D, L-1695, polysorbate 20, polysorbate 80 등 4종의 유화제에서 생육억제환을 생성하였다. L-7D, L-1695, polysorbate 20, polysorbate 80 4종의 유화제를 25, 50, 100, 200 mg/mL의 농도에서 항균활성을 검색한 결과, 농도가 작아질수록 생육억제환의 크기도 줄어들었으며, 유화제 중 L-1695 샘플이 200 mg/mL에서 가장 큰 생육억제환을 생성하였다. pH 및 열에 대해 안정성을 측정한 결과 L-7D, L-1695, polysorbate 20, polysorbate 80 4종의 유화제 모두 pH 및 열에 안정성을 가지고 있다는 것을 확인하였다. 최소저해농도를 측정한 결과 다른 유화제 L-7D, polysorbate 20, polysorbate 80 샘플과 비교하였을때 L-1695 샘플이 1.56 mg/mL에서 가장 좋은 최소저해농도를 나타냈다. 최소살균 효과는 L-7D, L-1695, polysorbate 20, polysorbate 80 4종의 유화제 모두 나타나지 않았다. 접촉표면의 부착제어능력을 확인하기 위해서 stainless steel과 ceramic에서 실험한 결과, 두 접촉 표면 모두에서 L-1695 샘플 처리 시 가장 적은 생균수를 나타냈다. 앞선 실험의 종합적인 결과에 따라 L-1695 유화제를 최종적으로 선별하고, 계육 피부에 부착된 C. jejuni에 영향을 주는지 CLSM으로 분석한 결과 대조구에 비하여 conventional spray 및 electrostatic spray를 처리하였을 때 모공에 부착된 균이 대다 수 떨어졌음을 확인하였다. 그러나 생균수를 확인해 본 결과 conventional spray와 electrostatic spray 처리 시에는 유의한 차이가 나타나지 않았다. 위 결과들을 종합한 결과 C. jejuni KCTC 5327에 대하여 L-1695 유화제는 생육을 억제시키지만, 살균효과는 없는 것을 확인하였다. 그러나 L-1695 유화제는 식품접촉표면에서 캠필로박터균의 부착을 저해하는 특성을 갖고 있으며, 계육 피부에 인위접종된 C. jejuni를 효과적으로 감소시키는 것을 볼 때, 실제 도계공정에서 세척수에 포함시켜 C. jejuni의 제어에 사용될 수 있을 것으로 기대된다.

• 미생물학회지
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• 제27권3호
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• pp.291-296
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• 1989

Campylobacter jejuni was studied for its disinfection by heat-and cold-treatment and UV-irradiation. When C. jejuni was treated by heat, no viable cell was found after 10 min treatment at $55^{\circ}C$, whereas small fraction of cell population was survived after 60 min treatment at $45^{\circ}C$ and $50^{\circ}C$. When they were treated by cold temperature for 30 days, no cell was survived at -$23^{\circ}C$ but about 4 log of the cells were survived at both temperature of $4^{\circ}C$ and -$40^{\circ}C$. When the organisms were UV-irradiated, thier survival rates were proportionally varied to the distance of irradiation. The scanning electron microscopic studies of C. jejuni cells treated by the disinfecting agents revealed that shapes of thecells were deformed from spiral rod into spherical form. The heat-treated cells showed rough and damaged surface on the scanning electron micrographs. In the heat-treated cells, some proteins of high molecular weight appeared to become accumulated in the electrophoretic analysis. The DNAs extracted from the cells treated with the physical agents showed some differences in agarose gel electrophoresis, comparing those of normal cells.

• Journal of Microbiology and Biotechnology
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• 제11권6호
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• pp.934-939
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• 2001

The growth inhibition of Campylobacter jejuni ATCC 33291 in the presence of $1\%$ acetic acid at 4, 25, and $42^{\circ}C$, followed by $25^{\circ}C$ and $4^{\circ}C$, at pH 5.5 and pH 6.5, and by the addition of $1\%$ acetic acid aat 4, 25, and $42^{\circ}C$ were determined to be 22, 8.5, and 1.4 min, respectively, in an FBP-SBB medium. The D values of C. jejuni were increased by the addition of chicken and did not follow the linear relationship observed in the FBP-SBB media without chicken. When using distilled water instead of FBP-SBB in the model system, the death rate of C. jejuni was dramatically accelerated. The injured or low cell numbers that were impossible to enumerate using the plate count method, were detected by a polymerase chain reaction and enrichment culture procedure. These results suggested that acetic acid is reliable and effective as a disinfectant, however, it is necessary to take additional care at refrigeration temperatures due to the potential of injred cells during poultry processing.

• Journal of Microbiology and Biotechnology
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• 제9권2호
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• pp.184-190
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• 1999

The use of the polymerase chain reaction (PCR) method was described using two sets of primers based on the ceuN gene (JEJ 1 and JEJ 2) which encodes a protein involved in siderophore transport and 16S rRNA gene (pA and pB) for the sensitive and specific detection of enteropathogen Campylobacter jejuni. Six oligonucleotides were utilized in an amplification experiment and PCR products of predicted sizes were generated from whole cells and boiled cell lysates at the same intensity. Two sets of the primer pairs, JEJ and pAB, were specific enough for all C. jejuni strains tested for the direct use of whole cells without DNA extraction or lysis steps. In the PCR using the pAB primer pair, the detection limit, as determined by the ethidium bromide staining of the amplification products on agarose gels, was at the level of $10^1$ bacteria cells or less in both the pure culture and artificially inoculated milk and chicken enrichment samples, whereas the detection limit with the JEJ primer pair was relatively low, i.e. $10^3$ cells or more in the same PCR samples. The PCR method using either a primer JEJ or pAB was both repeatable and specific for the detection of C. jejuni in food. This method is simply completed within 4 h.

• Genomics & Informatics
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• 제19권4호
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• pp.43.1-43.12
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• 2021

Campylobacter jejuni is one of the most prevalent organisms associated with foodborne illness across the globe causing campylobacteriosis and gastritis. Many proteins of C. jejuni are still unidentified. The purpose of this study was to determine the structure and function of a non-annotated hypothetical protein (HP) from C. jejuni. A number of properties like physiochemical characteristics, 3D structure, and functional annotation of the HP (accession No. CAG2129885.1) were predicted using various bioinformatics tools followed by further validation and quality assessment. Moreover, the protein-protein interactions and active site were obtained from the STRING and CASTp server, respectively. The hypothesized protein possesses various characteristics including an acidic pH, thermal stability, water solubility, and cytoplasmic distribution. While alpha-helix and random coil structures are the most prominent structural components of this protein, most of it is formed of helices and coils. Along with expected quality, the 3D model has been found to be novel. This study has identified the potential role of the HP in 2-methylcitric acid cycle and propionate catabolism. Furthermore, protein-protein interactions revealed several significant functional partners. The in-silico characterization of this protein will assist to understand its molecular mechanism of action better. The methodology of this study would also serve as the basis for additional research into proteomic and genomic data for functional potential identification.

• 미생물학회지
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• 제29권1호
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• pp.49-55
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• 1991

The heat shock responses of Campylobacter jejuni were studied by examination of their survival rates and synthesis of heat shocd proteins. When C. jejuni cells were treated at the sublethal temperatures of 48.deg.C for 30 minutes, most of the cells maintained their viabilities and synthesized the heat shock proteins of 90, 73, and 66 kD in molecular weight. By the method of two-dimensional electrophoresis, the heat shock proteins of C. jejuni were identified to be Hsp90, Hsp73, and Hsp66. During the heat shock at 48.deg.C, the heat shock proteins were induced from about 5 minutes after the heat shock treatment. Their synthesis was continued upto 30 minutes, but remarkably retarded after 50 minutes. When C. jejune cells were heat shocked at 51.deg.C for 30 minutes, the survival rates of the cells were decreased by about $10^{3}$ fold and synthesis of heat shock proteins and normal proteins was also generally retarded. The cells exposed to 55.deg.C for 30 minutes died off by more than $10^{5}$ cells and the new protein synthesis was not observed. But when C. jejuni cells were heat-shocked at the sublethal temperature of 48.deg.C for 15 to 20 minutes and then were exposed at the lethal temperature of 55.deg.C for 30 minutes, their viabilities were higher than those exposed at 55.deg.C for 30 minutes without pre-heat shock at 48.deg.C. Therefore, the heat shock proteins synthesized at the sublethal temperature of 48.deg.C in C. jejuni were thought to be responsible for thermotolerance. However, when C. jejuni cells heat-shocked at various ranges of sublethal and lethal temperatures were placed back to the optimum temperature of 42.deg.C, the multiplication patterns of the cells pretreated at different temperatures were not much different each other.

• Journal of Microbiology and Biotechnology
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• 제21권1호
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• pp.62-70
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• 2011

The antibacterial effects of nine lactic acid bacteria (LAB) against Campylobacter jejuni were investigated by using agar gel diffusion and co-culture assays. Some differences were recorded between the inhibition effects measured with these two methods. Only two LAB, Lb. pentosus CWBI B78 and E. faecium THT, exhibited a clear anti- Campylobacter activity in co-culture assay with dehydrated poultry excreta mixed with ground straw (DPE/GS) as the only growth substrate source. It was observed that the supplementation of such medium with a cellulase A complex (Beldem S.A.) enhanced the antimicrobial effect of both LAB strains. The co-culture medium acidification and the C. jejuni were positively correlated with the cellulase A concentration. The antibacterial effect was characterized by the lactic acid production from the homofermentative E. faecium THT and the lactic and acetic acids production from the heterofermentative Lb. pentosus CWBI B78. The antagonistic properties of LAB strains and enzyme combination could be used in strategies aiming at the reduction of Campylobacter prevalence in the poultry production chain and consequently the risk of human infection.

• 대한수의학회지
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• 제54권2호
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• pp.91-99
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• 2014

An antimicrobial susceptibility test was conducted to compare the resistance rates among Campylobacter spp. isolates from dogs (n = 50) raised under diverse conditions and humans (n = 50). More than 60% of Campylobacter (C.) jejuni from dogs and humans showed resistance to nalidixic acid, enrofloxacin and ciprofloxacin. C. jejuni isolates from humans showed higher resistance to tetracycline (83.3%) and ampicillin (91.3%) than those from dogs. None of the C. jejuni or Campylobacter coli isolates from humans or dogs were resistant to erythromycin. Overall, 85% of Campylobacter spp. isolates showed a multidrug resistant phenotype. Nucleotide sequencing analysis of the gryA gene showed that 100% of $NA^R/CIP^R$ C. jejuni isolates from dogs and humans had the Thr-$86^{th}$-Ile mutation, which is associated with fluoroquinolone resistance. flaA PCR restriction fragment length polymorphism (RFLP) typing to differentiate the isolates below the species level revealed 12 different clusters out of 73 strains. The human isolates belonged to eight different RFLP clusters, while five clusters contained dog and human isolates.

• Bulletin of the Korean Chemical Society
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• 제29권7호
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• pp.1315-1319
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• 2008

A trisaccharide, 6d-Altro-Hepp$\alpha$ (1$\rightarrow$3) GlcNAc$\beta$ (1$\rightarrow$3) Gal$\alpha$ (1$\rightarrow$$OCH_2CH_2N_3$, as an O-antigenic repeating unit of Campylobacter jejuni serotypes O:23 and O:36, was synthesized. Coupling of the 6d-altro-Hepp$\alpha$ (1$\rightarrow$3) GlcNAc$\beta$ (1$\rightarrow$SEt donor with Gal$\alpha$ (1${\rightarrow}OCH_2CH_2Cl$ acceptor in the presence of NIS-TfOH promoter afforded the trisaccharide having the $\beta$ (1$\rightarrow$3) Gal linkage. $\beta$ -Stereospecificity and the desired regioselectivity for the 3-OH Gal are obtained. Subsequent hydrogenation, acetylation, azide displacement, hydrazinolysis, Nacetylation, and finally deacetylation furnished the title trisaccharide hapten for further glycoconjugation.

• Journal of Microbiology and Biotechnology
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• 제27권9호
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• pp.1609-1616
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• 2017

The complex roles of cell surface modification in the biofilm formation of Campylobacter jejuni, a major cause of worldwide foodborne diarrheal disease, are poorly understood. In a screen of mutants from random transposon mutagenesis, an insertional mutation in the eptC gene (cj0256) resulted in a significant decrease in C. jejuni NCTC11168 biofilm formation (<20%) on major food contact surfaces, such as polystyrene and borosilicate glass, when compared with wild-type cells (p < 0.05). In C. jejuni strain 81-176, the protein encoded by eptC modified cell surface structures, such as lipid A, the inner core of lipooligosaccharide, and the flagellar rod protein (FlgG), by attaching phosphoethanolamine. To assess the role of eptC in C. jejuni NCTC11168, adherence and motility tests were performed. In adhesion assays with glass surfaces, the eptC mutant exhibited a $0.77log\;CFU/cm^2$ decrease in adherence compared with wild-type cells during the initial 2 h of the assay (p < 0.05). These results support the hypothesis that the modification of cell surface structures by eptC affects the initial adherence in biofilm formation of C. jejuni NCTC11168. In motility tests, the eptC mutant demonstrated reduced motility when compared with wild-type cells, but wild-type cells with the transposon inserted in a gene irrelevant to biofilm formation (cj1111c) also exhibited decreased motility to a similar extent as the eptC mutant. This suggests that although eptC affects motility, it does not significantly affect biofilm formation. This study demonstrates that eptC is essential for initial adherence, and plays a significant role in the biofilm formation of C. jejuni NCTC11168.