• Title/Summary/Keyword: protein detection

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Minor Coat Protein pIII Domain (N1N2) of Bacteriophage CTXф Confers a Novel Surface Plasmon Resonance Biosensor for Rapid Detection of Vibrio cholerae

  • Shin, Hae Ja;Hyeon, Seok Hywan;Cho, Jae Ho;Lim, Woon Ki
    • Microbiology and Biotechnology Letters
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    • v.49 no.4
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    • pp.510-518
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    • 2021
  • Bacteriophages are considered excellent sensing elements for platforms detecting bacteria. However, their lytic cycle has restricted their efficacy. Here, we used the minor coat protein pIII domain (N1N2) of phage CTXφ to construct a novel surface plasmon resonance (SPR) biosensor that could detect Vibrio cholerae. N1N2 harboring the domains required for phage adsorption and entry was obtained from Escherichia coli using recombinant protein expression and purification. SDS-PAGE revealed an approximate size of 30 kDa for N1N2. Dot blot and transmission electron microscopy analyses revealed that the protein bound to the host V. cholerae but not to non-host E. coli K-12 cells. Next, we used amine-coupling to develop a novel recombinant N1N2 (rN1N2)-functionalized SPR biosensor by immobilizing rN1N2 proteins on gold substrates and using SPR to monitor the binding kinetics of the proteins with target bacteria. We observed rapid detection of V. cholerae in the range of approximately 103 to 109 CFU/ml but not of E. coli at any tested concentration, thereby confirming that the biosensor exhibited differential recognition and binding. The results indicate that the novel biosensor can rapidly monitor a target pathogenic microorganism in the environment and is very useful for monitoring food safety and facilitating early disease prevention.

Applications and Developmental Prospect of Protein Microarray Technology (Protein Microarray의 응용 및 발전 전망)

  • Oh, Young-Hee;Han, Min-Kyu;Kim, Hak-Sung
    • KSBB Journal
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    • v.22 no.6
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    • pp.393-400
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    • 2007
  • Analysis of protein interactions/functions in a microarray format has been of great potential in drug discovery, diagnostics, and cell biology, because it is amenable to large-scale and high-throughput biological assays in a rapid and economical way. In recent years, the protein microarray have broaden their utility towards the global analysis of protein interactions on a proteome scale, the functional activity analysis based on protein interactions and post-translational modifications (PTMs), and the discovery of biomarkers through profiling of protein expression between sample and reference pool. As a promising tool for proteomics, the protein microarray technology has advanced outstandingly over the past decade in terms of surface chemistry, acquisition of relevant proteins on a proteomic level, and detection methods. In this article, we briefly describe various techniques for development of protein microarray, and introduce developmental state of protein microarray and its applications.

Validation and Application of a Real-time PCR Protocol for the Specific Detection and Quantification of Clavibacter michiganensis subsp. sepedonicus in Potato

  • Cho, Min Seok;Park, Duck Hwan;Namgung, Min;Ahn, Tae-Young;Park, Dong Suk
    • The Plant Pathology Journal
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    • v.31 no.2
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    • pp.123-131
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    • 2015
  • Clavibacter michiganensis subsp. sepedonicus (Cms) multiplies very rapidly, passing through the vascular strands and into the stems and petioles of a diseased potato. Therefore, the rapid and specific detection of this pathogen is highly important for the effective control of the pathogen. Although several PCR assays have been developed for detection, they cannot afford specific detection of Cms. Therefore, in this study, a computational genome analysis was performed to compare the sequenced genomes of the C. michiganensis subspecies and to identify an appropriate gene for the development of a subspecies-specific PCR primer set (Cms89F/R). The specificity of the primer set based on the putative phage-related protein was evaluated using genomic DNA from seven isolates of Cms and 27 other reference strains. The Cms89F/R primer set was more specific and sensitive than the existing assays in detecting Cms in in vitro using Cms cells and its genomic DNA. This assay was also able to detect at least $1.47{\times}10^2copies/{\mu}l$ of cloned-amplified target DNA, 5 fg of DNA using genomic DNA or $10^{-6}$ dilution point of 0.12 at $OD_{600}$ units of cells per reaction using a calibrated cell suspension.

Development of a pretreatment method for determination of levels of perfluorinated compounds in foods according to fat and protein contents (지방과 단백질 함량에 따른 식품의 과불화화합물 분석을 위한 전처리 방법 확립)

  • Bang, Sunah;Park, Na-youn;Hwang, Youngrim;Kang, Gil Jin;Kim, Hye-Jeong;Kang, Young-Woon;Kho, Younglim;Kim, Jung Hoan
    • Korean Journal of Food Science and Technology
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    • v.50 no.1
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    • pp.14-20
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    • 2018
  • Perfluorinated compounds (PFCs) have recently been recognized as global environmental pollutants. This study was performed to develop an analytical method for determination of levels of PFCs in food by LC-MS/MS. One hundred and nine food products were divided into two groups based on their fat and protein contents (high and low), following which samples containing high fat and protein contents were pooled and subjected to pretreatment consisting of enzymatic degradation and hexane extraction. The limit of detection of 17 PFCs in the samples were in the range of 0.013-0.145 ng/g. The degrees of precision of detection for group 1 (samples with low fat and protein contents) and group 2 (samples with high fat and protein contents) were 0.8-21.1 and 1.7-28.2%, respectively, with an accuracy of 78.8-109.8% for group 1 and 80-114.5% for group 2. This study indicated that pretreatment of high fat and protein foods with enzymatic degradation and hexane extraction would improve the detection of PFCs in food.

Effect of Heat, Pressure, and Acid Treatments on DNA and Protein Stability in GM Soybean (GM 콩 DNA와 단백질의 안정성에 대한 열, 압력 및 산 처리의 영향)

  • Pack, In-Soon;Jeong, Soon-Chun;Yoon, Won-Kee;Park, Sang-Kyu;Youk, Eun-Soo;Kim, Hwan-Mook
    • Korean Journal of Food Science and Technology
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    • v.36 no.4
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    • pp.677-682
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    • 2004
  • Debates on safety of genetically modified (GM) crops have led to mandatory-labeling legislation of GM foods in many countries including Korea. Effects of heat, pressure, and acid treatments on degradation of DNAs or proteins in GM soybean at levels below detection limits of qualitative PCR and lateral flow strip test (LFST) methods were examined. Results showed that genomic DNAs and proteins were degraded into fragment sizes no longer possible for detection of inserted gene depending on thermal, or thermal and pressure treatment period. Detectaability of LFST for toasted meal increased in weakly treated soybean. DNA and protein detection methods were barely effective for detection of GM ingredient after $121^{\circ}C$ and 1.5 atmospheric treatment for 20 min. These results will be useful in determining GM labeling requirements of processed foods.

Immunological Study on the Diapause of Silkworm (Bombyx mori L..) (가잠의 휴면성에 관한 면역학적 연구)

  • 마영일;박광의
    • Journal of Sericultural and Entomological Science
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    • v.15 no.2
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    • pp.1-7
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    • 1973
  • It was found that the diapause in the silkworm egg is induced by the action of the diapause hormone secreted from the suboesophageal ganglion, and "esterase A" affects protein metabolism in oocyte and egg. In this connection, some changes in protein metabolism of silkworm egg according to embryonic developments could give some information on the diapause, using Ouchterlony Test. Antigenicity of the protein of silkworm egg was detected through antigen-antibody interaction among the extracts of rabbit blood. Furthermore, existence of the specific antigen was also detected according to embryonic development, using the adsorption test. The results were obtained as follows: 1 Detection of antigenicity The antigenicity of silkworm egg was ascertained by inoculating it into a rabbit, but positive results were shown in most of the silkworm eggs tested, whereas the antibody specific to a certain antigen was not detected. 2. Detection of the common antigen It was demonstrated that most of the antigen could incite the common antibodies, but the specific antibody formation was not detected in a few antigens, even though the nonspecific antibody formation was displayed. 3. Detection of the specific antigen It is suggested that there are the specific antigens detectable in each treated eggs by the adsorption test.

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