1
|
Wu L, Bian W, Abubakar YS, Lin J, Yan H, Zhang H, Wang Z, Wu C, Shim W, Lu GD. FvKex2 is required for development, virulence, and mycotoxin production in Fusarium verticillioides. Appl Microbiol Biotechnol 2024; 108:228. [PMID: 38386129 PMCID: PMC10884074 DOI: 10.1007/s00253-024-13022-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 01/03/2024] [Accepted: 01/18/2024] [Indexed: 02/23/2024]
Abstract
Fusarium verticillioides is one of the most important fungal pathogens causing maize ear and stalk rots, thereby undermining global food security. Infected seeds are usually unhealthy for consumption due to contamination with fumonisin B1 (FB1) mycotoxin produced by the fungus as a virulence factor. Unveiling the molecular factors that determine fungal development and pathogenesis will help in the control and management of the diseases. Kex2 is a kexin-like Golgi-resident proprotein convertase that is involved in the activation of some important proproteins. Herein, we identified and functionally characterized FvKex2 in relation to F. verticillioides development and virulence by bioinformatics and functional genomics approaches. We found that FvKex2 is required for the fungal normal vegetative growth, because the growth of the ∆Fvkex2 mutant was significantly reduced on culture media compared to the wild-type and complemented strains. The mutant also produced very few conidia with morphologically abnormal shapes when compared with those from the wild type. However, the kexin-like protein was dispensable for the male role in sexual reproduction in F. verticillioides. In contrast, pathogenicity was nearly abolished on wounded maize stalks and sugarcane leaves in the absence of FvKEX2 gene, suggesting an essential role of Fvkex2 in the virulence of F. verticillioides. Furthermore, high-performance liquid chromatography analysis revealed that the ∆Fvkex2 mutant produced a significantly lower level of FB1 mycotoxin compared to the wild-type and complemented strains, consistent with the loss of virulence observed in the mutant. Taken together, our results indicate that FvKex2 is critical for vegetative growth, FB1 biosynthesis, and virulence, but dispensable for sexual reproduction in F. verticillioides. The study presents the kexin-like protein as a potential drug target for the management of the devastating maize ear and stalk rot diseases. Further studies should aim at uncovering the link between FvKex2 activity and FB1 biosynthesis genes. KEY POINTS: •The kexin-like protein FvKex2 contributes significantly to the vegetative growth of Fusarium verticillioides. •The conserved protein is required for fungal conidiation and conidial morphology, but dispensable for sexual reproduction. •Deletion of FvKEX2 greatly attenuates the virulence and mycotoxin production potential of F. verticillioides.
Collapse
Affiliation(s)
- Limin Wu
- Fujian Vocational College of Bioengineering, Fuzhou, 350002, China
| | - Wenyin Bian
- Key Laboratory of Bio-Pesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fujian, Fuzhou, 350002, China
| | - Yakubu Saddeeq Abubakar
- Key Laboratory of Bio-Pesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fujian, Fuzhou, 350002, China
- Department of Biochemistry, Ahmadu Bello University, Zaria, 810281, Nigeria
| | - Jiayi Lin
- Guangzhou University of Chinese Medicine, Guangzhou, 510006, China
| | - Huijuan Yan
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX, 77843-2132, USA
| | - Huan Zhang
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX, 77843-2132, USA
| | - Zonghua Wang
- Key Laboratory of Bio-Pesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fujian, Fuzhou, 350002, China
| | - Changbiao Wu
- Fujian Vocational College of Bioengineering, Fuzhou, 350002, China
| | - WonBo Shim
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX, 77843-2132, USA.
| | - Guo-Dong Lu
- Key Laboratory of Bio-Pesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fujian, Fuzhou, 350002, China.
| |
Collapse
|
2
|
Kim SA, Lee JE, Kim DH, Lee SM, Yang HK, Shim WB. A Highly Sensitive Indirect Enzyme-Linked Immunosorbent Assay (ELISA) Based on a Monoclonal Antibody Specific to Thermal Stable-Soluble Protein in Pork Fat for the Rapid Detection of Pork Fat Adulterated in Heat-Processed Beef Meatballs. Food Sci Anim Resour 2023; 43:989-1001. [PMID: 37969326 PMCID: PMC10636219 DOI: 10.5851/kosfa.2023.e55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2023] [Revised: 09/08/2023] [Accepted: 09/14/2023] [Indexed: 11/17/2023] Open
Abstract
Processed foods containing pork fat tissue to improve flavor and gain economic benefit may cause severe issues for Muslims, Jews, and vegetarians. This study aimed to develop an indirect enzyme-linked immunosorbent assay (iELISA) based on a monoclonal antibody specific to thermal stable-soluble protein in pork fat tissue and apply it to detect pork fat tissue in heat-processed (autoclave, steam, roast, and fry) beef meatballs. To develop a sensitive iELISA, the optimal sample pre-cooking time, coating conditions, primary and secondary dilution time, and various buffer systems were tested. The change in the iELISA sensitivity with different 96-well microtiter microplates was confirmed. The detection limit of iELISA performed with an appropriate microplate was 0.015% (w/w) pork fat in raw and heat-treated beef. No cross-reactions to other meats or fats were shown. These results mean that the iELISA can be used as an analytical method to detect trace amounts of pork fat mixed in beef.
Collapse
Affiliation(s)
- Sol-A Kim
- Division of Applied Life Science, Graduate
School, Gyeongsang National University, Jinju 52828,
Korea
| | - Jeong-Eun Lee
- Institute of Smart Farm, Gyeongsang
National University, Jinju 52828, Korea
| | - Dong-Hyun Kim
- Division of Applied Life Science, Graduate
School, Gyeongsang National University, Jinju 52828,
Korea
| | - Song-min Lee
- Division of Applied Life Science, Graduate
School, Gyeongsang National University, Jinju 52828,
Korea
| | - Hee-Kyeong Yang
- Division of Applied Life Science, Graduate
School, Gyeongsang National University, Jinju 52828,
Korea
| | - Won-Bo Shim
- Institute of Smart Farm, Gyeongsang
National University, Jinju 52828, Korea
- Division of Food Science and Technology,
Gyeongsang National University, Jinju 52828, Korea
- Institute of Agriculture and Life Science,
Gyeongsang National University, Jinju 52828, Korea
| |
Collapse
|
3
|
Sun K, Li Y, Gai Y, Wang J, Jian Y, Liu X, Wu L, Shim WB, Lee YW, Ma Z, Haas H, Yin Y. HapX-mediated H2B deub1 and SreA-mediated H2A.Z deposition coordinate in fungal iron resistance. Nucleic Acids Res 2023; 51:10238-10260. [PMID: 37650633 PMCID: PMC10602907 DOI: 10.1093/nar/gkad708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 07/26/2023] [Accepted: 08/15/2023] [Indexed: 09/01/2023] Open
Abstract
Plant pathogens are challenged by host-derived iron starvation or excess during infection, but the mechanism through which pathogens counteract iron stress is unclear. Here, we found that Fusarium graminearum encounters iron excess during the colonization of wheat heads. Deletion of heme activator protein X (FgHapX), siderophore transcription factor A (FgSreA) or both attenuated virulence. Further, we found that FgHapX activates iron storage under iron excess by promoting histone H2B deubiquitination (H2B deub1) at the promoter of the responsible gene. Meanwhile, FgSreA is shown to inhibit genes mediating iron acquisition during iron excess by facilitating the deposition of histone variant H2A.Z and histone 3 lysine 27 trimethylation (H3K27 me3) at the first nucleosome after the transcription start site. In addition, the monothiol glutaredoxin FgGrx4 is responsible for iron sensing and control of the transcriptional activity of FgHapX and FgSreA via modulation of their enrichment at target genes and recruitment of epigenetic regulators, respectively. Taken together, our findings elucidated the molecular mechanisms for adaptation to iron excess mediated by FgHapX and FgSreA during infection in F. graminearum and provide novel insights into regulation of iron homeostasis at the chromatin level in eukaryotes.
Collapse
Affiliation(s)
- Kewei Sun
- State Key Laboratory of Rice Biology, the Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Biotechnology, Zhejiang University, Hangzhou, China
| | - Yiqing Li
- State Key Laboratory of Rice Biology, the Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Biotechnology, Zhejiang University, Hangzhou, China
| | - Yunpeng Gai
- School of Grassland Science, Beijing Forestry University, Beijing, China
| | - Jingrui Wang
- State Key Laboratory of Rice Biology, the Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Biotechnology, Zhejiang University, Hangzhou, China
| | - Yunqing Jian
- State Key Laboratory of Rice Biology, the Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Biotechnology, Zhejiang University, Hangzhou, China
| | - Xin Liu
- Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Liang Wu
- Institute of Crop Science, Zhejiang University, Hangzhou, China
| | - Won-Bo Shim
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, USA
| | - Yin-Won Lee
- Department of Agricultural Biotechnology, Seoul National University, Seoul, Korea
| | - Zhonghua Ma
- State Key Laboratory of Rice Biology, the Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Biotechnology, Zhejiang University, Hangzhou, China
| | - Hubertus Haas
- Instiute of Molecular Biology, Biocenter, Medical University Innsbruck, Innsbruck A-6020, Austria
| | - Yanni Yin
- State Key Laboratory of Rice Biology, the Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Biotechnology, Zhejiang University, Hangzhou, China
| |
Collapse
|
4
|
Kim SA, Toushik SH, Lee JE, Shim WB. Detection of a Thermal Stable-Soluble Protein (TSSP) as a Marker of Peanut Adulteration Using a Highly Sensitive Indirect Enzyme-Linked Immunosorbent Assay based on Monoclonal Antibodies. J Microbiol Biotechnol 2023; 33:1170-1178. [PMID: 37386719 PMCID: PMC10580888 DOI: 10.4014/jmb.2304.04038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 05/06/2023] [Accepted: 05/15/2023] [Indexed: 07/01/2023]
Abstract
Food allergy represents a severe problem for many societies, including sensitive populations, academies, health authorities, and the food industry. Peanut allergy occupies a special place in the food allergy spectrum. To prevent consumption by consumers suffering from a peanut allergy, a rapid and sensitive detection method is essential to identify unintended peanut adulteration in processed foods. In this study, we produced four monoclonal antibodies (MAbs; RO 3A1-12, PB 4C12-10, PB 5F9-23, and PB 6G4-30) specific to thermo-stable and soluble proteins (TSSPs) of peanut and developed an enzyme-linked immunosorbent assay (ELISA) based on the MAbs. Among them, PB 5F9-23 MAb was firmly bound to Ara h 1, and other MAbs strongly reacted to Ara h 3 in the Western blot analysis. An antibody cocktail solution of the MAbs was used to enhance the sensitivity of an indirect ELISA, and the limit of detection of the indirect ELISA based on the antibody cocktail solution was 1 ng/ml and improved compared to the indirect ELISA based on the single MAb (11 ng/ml). The cross-reaction analysis revealed the high specificity of developed MAbs to peanut TSSPs without cross-reaction to other food allergens, including nuts. Subsequently, analyzing processed foods by indirect ELISA, all foods labeled as containing peanuts in the product description were confirmed to be positive. The results indicate that the developed antibodies exhibit high specificity and sensitivity to peanuts and can be used as bio-receptors in immunoassays or biosensors to detect intentional or unintentional adulteration of peanuts in processed foods, particularly heat-processed foods.
Collapse
Affiliation(s)
- Sol-A Kim
- Division of Applied Life Science, Graduate School, Gyeongsang National University, Jinju, Gyeongnam 52828, Republic of Korea
| | | | - Jeong-Eun Lee
- Institute of Smart Farm Research Center, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Won-Bo Shim
- Institute of Smart Farm Research Center, Gyeongsang National University, Jinju 52828, Republic of Korea
- Institute of Agricultural and Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea
- Division of Food Science and Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| |
Collapse
|
5
|
Kim TH, Song Z, Jung J, Sung JS, Kang MJ, Shim WB, Lee M, Pyun JC. Functionalized Parylene Films for Enhancement of Antibody Production by Hybridoma Cells. ACS Appl Bio Mater 2023; 6:3726-3738. [PMID: 37647153 DOI: 10.1021/acsabm.3c00417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
In this study, the influence of microenvironments on antibody production of hybridoma cells was analyzed using six types of functionalized parylene films, parylene-N and parylene-C (before and after UV radiation), parylene-AM, and parylene-H, and using polystyrene as a negative control. Hybridoma cells were cultured on modified parylene films that produced a monoclonal antibody against the well-known fungal toxin ochratoxin-A. Surface properties were analyzed for each parylene film, such as roughness, chemical functional groups, and hydrophilicity. The proliferation rate of the hybridoma cells was observed for each parylene film by counting the number of adherent cells, and the total amount of produced antibodies from different parylene films was estimated using indirect ELISA. In comparison with the polystyrene, the antibody-production by parylene-H and parylene-AM was estimated to be observed to be as high as 210-244% after the culture of 24 h. These results indicate that the chemical functional groups of the culture plate could influence antibody production. To analyze the influence of the microenvironments of the modified parylene films, we performed cell cycle analysis to estimate the ratio of the G0/G1, S, and G2/M phases of the hybridoma cells on each parylene film. From the normalized proportion of phases of the cell cycle, the difference in antibody production from different surfaces was considered to result from the difference in the proliferation rate of hybridoma cells, which occurred from the different physical and chemical properties of the parylene films. Finally, protein expression was analyzed using an mRNA array to determine the effect of parylene films on protein expression in hybridoma cells. The expression of three antibody production-related genes (CD40, Sox4, and RelB) was analyzed in hybridoma cells cultured on modified parylene films.
Collapse
Affiliation(s)
- Tae-Hun Kim
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-gu, Seoul 03722, South Korea
| | - Zhiquan Song
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-gu, Seoul 03722, South Korea
| | - Jaeyong Jung
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-gu, Seoul 03722, South Korea
| | - Jeong-Soo Sung
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-gu, Seoul 03722, South Korea
| | - Min-Jung Kang
- Center for Advanced Biomolecular Recognition, Korea Institute of Science and Technology (KIST), Seoul 02792, South Korea
| | - Won-Bo Shim
- Department of Food Science and Technology & Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea
| | - Misu Lee
- Division of Life Sciences, College of Life Science and Bioengineering and △Institute for New Drug Development, College of Life Science and Bioengineering, Incheon National University, Incheon 22012, South Korea
| | - Jae-Chul Pyun
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-gu, Seoul 03722, South Korea
| |
Collapse
|
6
|
Lee JE, Toushik SH, Park HJ, Kim SA, Shim WB. Rapid detection of Shiga-toxin-producing Escherichia coli O157:H7 based on a colorimetric loop-mediated isothermal amplification (cLAMP) assay using a molecular beacon paired with HRPzyme. Anal Bioanal Chem 2023; 415:4973-4984. [PMID: 37365333 DOI: 10.1007/s00216-023-04803-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 06/12/2023] [Accepted: 06/13/2023] [Indexed: 06/28/2023]
Abstract
Contamination by Escherichia coli O157:H7 is considered a threat in the livestock and food industries. Therefore, it is necessary to develop methods for the convenient and rapid detection of Shiga-toxin-producing E. coli O157:H7. This study aimed to develop a colorimetric loop-mediated isothermal amplification (cLAMP) assay using a molecular beacon to rapidly detect E. coli O157:H7. Primers and a molecular beacon were designed for targeting the Shiga-toxin-producing virulence genes (stx1 and stx2) as molecular markers. Additionally, Bst polymerase concentration and amplification conditions for bacterial detection were optimized. The sensitivity and specificity of the assay were also investigated and validated on artificially tainted (100-104 CFU/g) Korean beef samples. The cLAMP assay could detect 1 × 101 CFU/g at 65 °C for both genes, and the assay was confirmed to be specific for E. coli O157:H7. The cLAMP takes about an hour and does not require expensive devices (e.g., thermal cycler and detector). Hence, the cLAMP assay proposed herein can be used in the meat industry as a fast and simple way to detect E. coli O157:H7.
Collapse
Affiliation(s)
- Jeong-Eun Lee
- Institute of Smart Farm Research Center, Gyeongsang National University, Gyeongnam, Jinju, 52828, Korea
| | | | - Hyun-Jin Park
- Division of Applied Life Science, Graduate School, Gyeongsang National University, Gyeongnam, Jinju, 52828, Korea
| | - Sol-A Kim
- Division of Applied Life Science, Graduate School, Gyeongsang National University, Gyeongnam, Jinju, 52828, Korea
| | - Won-Bo Shim
- Division of Applied Life Science, Graduate School, Gyeongsang National University, Gyeongnam, Jinju, 52828, Korea.
- Institute of Agricultural and Life Science, Gyeongsang National University, Gyeongnam, Jinju, 52828, Korea.
- Division of Food Science and Technology, Gyeongsang National University, Gyeongnam, Jinju, 52828, Korea.
| |
Collapse
|
7
|
Kim SA, Toushik SH, Lee JE, Shim WB. Ultrasensitive monoclonal antibodies specific to thermal stable-soluble proteins of buckwheat. Food Chem 2023; 423:136269. [PMID: 37172503 DOI: 10.1016/j.foodchem.2023.136269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 04/20/2023] [Accepted: 04/27/2023] [Indexed: 05/15/2023]
Abstract
Buckwheat is considered a severe food allergen, and its adulteration and mislabeling cause serious health risks. For protecting consumers suffering from buckwheat allergy, a high-sensitivity detection method is necessary to accurately identify intentional or unintentional adulteration of buckwheat in processed foods. The study revealed that buckwheat contains a significant amount of thermally stable-soluble proteins (TSSPs), which keep antigenicity even after heat treatment. Therefore, we used TSSPs to produce three monoclonal antibodies (MAbs) specific to buckwheat. A MAbs cocktail solution was subjected to enhance the sensitivity of an indirect enzyme-linked immunosorbent assay (iELISA), and the LOD was 1 ng/mL. The MAbs cocktail solution based-iELISA can successfully detect buckwheat adulterated in processed foods. The results suggested that the TSSPs in buckwheat can be used as suitable immunogens, and MAbs produced can be used as bioreceptor to develop immunoassays and biosensors for detecting buckwheat in food facilities and processed foods.
Collapse
Affiliation(s)
- Sol-A Kim
- Division of Applied Life Science, Graduate School, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea
| | | | - Jeong-Eun Lee
- Institute of Smart Farm Research Center, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea
| | - Won-Bo Shim
- Department of Food Science and Technology, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea; Institute of Smart Farm Research Center, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea; Institute of Agricultural and Life Science, Gyeongsang National University, Jinju, Gyeongnam 52828, South Korea.
| |
Collapse
|
8
|
Toushik SH, Kim K, Park SH, Park JH, Ashrafudoulla M, Ulrich MSI, Mizan MFR, Hossain MI, Shim WB, Kang I, Ha SD. Prophylactic efficacy of Lactobacillus curvatus B67-derived postbiotic and quercetin, separately and combined, against Listeria monocytogenes and Salmonella enterica ser. Typhimurium on processed meat sausage. Meat Sci 2023; 197:109065. [PMID: 36481517 DOI: 10.1016/j.meatsci.2022.109065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 08/22/2022] [Accepted: 11/29/2022] [Indexed: 12/03/2022]
Abstract
This study investigated the antimicrobial and antibiofilm efficacy of separate and combined treatments of Lactobacillus curvatus B67-produced postbiotic and the polyphenolic flavanol quercetin against Listeria monocytogenes and Salmonella enterica ser. Typhimurium. The antimicrobial potentiality of the postbiotic was chiefly associated with organic acids (e.g., lactic and acetic acids). At sub-minimum inhibitory concentration (1/2 MIC), the postbiotic and quercetin effectively reduced the pathogenic biofilm cells on processed pork sausage and meat-processing surfaces (e.g., stainless-steel and rubber). Moreover, the postbiotic exhibited strong residual antimicrobial efficacy over diverse pH and temperature ranges. In addition, the combination of postbiotic with quercetin increased the leakage of pathogenic intracellular metabolites (e.g., nucleic acids and protein) and inhibited pathogenic biofilm formation on both biotic and abiotic surfaces. Therefore, this study confirmed that lactic acid bacteria-derived postbiotic and plant-derived quercetin could be used as potential alternative bioprotective agents in the meat processing industry.
Collapse
Affiliation(s)
- Sazzad Hossen Toushik
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, 72-1 Nae-ri, Anseong, Gyeonggi-do 456-756, Republic of Korea; Department of Microbiology, Stamford University Bangladesh, Dhaka 1217, Bangladesh
| | - Kyeongjun Kim
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, 72-1 Nae-ri, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Sang-Hyeok Park
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, 72-1 Nae-ri, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Jun-Ha Park
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, 72-1 Nae-ri, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Md Ashrafudoulla
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, 72-1 Nae-ri, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Mevo Senakpon Isaie Ulrich
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, 72-1 Nae-ri, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Md Furkanur Rahman Mizan
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, 72-1 Nae-ri, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Md Iqbal Hossain
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, 72-1 Nae-ri, Anseong, Gyeonggi-do 456-756, Republic of Korea
| | - Won-Bo Shim
- Division of Food Science and Technology, Gyeongsang National University, Gyeongnam 52828, Republic of Korea
| | - Iksoon Kang
- Department of Animal Science, California Polytechnic State University, San Luis Obispo, CA 93407, USA
| | - Sang-Do Ha
- Advanced Food Safety Research Group, Department of Food Science and Technology, Chung-Ang University, 72-1 Nae-ri, Anseong, Gyeonggi-do 456-756, Republic of Korea.
| |
Collapse
|
9
|
Kim TH, Bong JH, Kim HR, Shim WB, Kang MJ, Pyun JC. One-step immunoassay based on switching peptides for analyzing ochratoxin A in wines. J Anal Sci Technol 2022. [DOI: 10.1186/s40543-022-00352-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
AbstractA one-step immunoassay is presented for the detection of ochratoxin A (OTA) using an antibody complex with switching peptides. Because the switching peptides (fluorescence-labeled) were able to bind the frame region of antibodies (IgGs), they were dissociated from antibodies immediately when target analytes were bound to the binding pockets of antibodies. From the fluorescence signal measurements of switching peptides, a quantitative analysis of target analytes, via a one-step immunoassay without any washing steps, could be performed. As the first step, the binding constant (KD) of OTA to the antibodies was estimated under the continuous flow conditions of a surface plasmon resonance biosensor. Then, the optimal switching peptide, among four types of switching peptides, and the reaction condition for complex formation with the switching peptide were determined for the one-step immunoassay for OTA analysis. Additionally, the selectivity test of one-step immunoassay for OTA was carried out in comparison with phenylalanine and zearalenone. For the application to the one-step immunoassay to detect OTA in wines, two types of sample pre-treatment methods were compared: (1) a liquid extraction was carried out using chloroform as a solvent with subsequent resuspension in phosphate-buffered saline (total analysis time < 1 h); (2) direct dilution of the wine sample (total analysis time < 0.5 h). Finally, the direct dilution method was found to be effective for the one-step immunoassay based on the switching peptide assay for OTA in wines with a markedly improved total analysis time (< 0.5 h). Additionally, the assay results were compared with commercial lateral flow immunoassay.
Collapse
|
10
|
Lee JE, Kim SA, Park HJ, Mun H, Ha KS, Shim WB. Colorimetric detection of norovirus by helicase-dependent amplification method based on specific primers integrated with HRPzyme. Anal Bioanal Chem 2022; 414:6723-6733. [PMID: 35931785 DOI: 10.1007/s00216-022-04247-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 07/11/2022] [Accepted: 07/21/2022] [Indexed: 11/28/2022]
Abstract
Noroviruses (NoVs) are the most common causes of epidemic gastroenteritis, responsible for at least 50% of all gastroenteritis outbreaks worldwide and significant causes of foodborne illness. In the USA, approximately 21 million illnesses attributable to NoVs have annually occurred. Therefore, there is a great demand to develop a rapid, low-cost, and accurate detection method for NoVs. This study first reported colorimetric helicase-dependent amplification (HDA) methods based on specific primers integrated with HRPzyme for the rapid and sensitive detection of NoV GI and GII. The colorimetric HDA methods exhibited a detection limit of 10 copies mL-1 of each NoV GI and GII and were confirmed to be specific to each NoV GI and GII. The period required to complete the HDA method was 2 h, including a step of RNA extraction and cDNA synthesis without expensive instruments such as a thermal cycler and detector. The cutoff value of the method for the oyster artificially inoculated with a known amount of NoV was all 102 copies g-1 for NoV GI and GII. Therefore, the HDA method developed in this study can be useful tool for the on-site detection of NoVs in food samples.
Collapse
Affiliation(s)
- Jeong-Eun Lee
- Institute of Smart Farm, Gyeongsang National University, Jinju, 52828, Gyeongnam, Korea
| | - Sol-A Kim
- Division of Applied Life Science, Graduate School, Gyeongsang National University, Jinju, 52828, Gyeongnam, Korea
| | - Hyun-Jin Park
- Division of Applied Life Science, Graduate School, Gyeongsang National University, Jinju, 52828, Gyeongnam, Korea
| | - Hyoyoung Mun
- Apteasy MJ Inc., 333 Cheomdangwagi-ro, Technopark, Gwangju, 61008, Korea
| | - Kwang-Soo Ha
- Southeast Sea Fisheries Research Institute, National Institute of Fisheries Science, Tongyeong, 53085, Korea
| | - Won-Bo Shim
- Institute of Smart Farm, Gyeongsang National University, Jinju, 52828, Gyeongnam, Korea. .,Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, 52828, Gyeongnam, Korea. .,Department of Food Science and Technology, Gyeongsang National University, Jinju, 52828, Gyeongnam, Korea.
| |
Collapse
|
11
|
Kim HR, Bong JH, Kim TH, Shin SS, Kang MJ, Shim WB, Lee DY, Son DH, Pyun JC. One-Step Homogeneous Immunoassay for the Detection of Influenza Virus Using Switching Peptide and Graphene Quencher. BioChip J 2022; 16:334-341. [PMID: 35909466 PMCID: PMC9326414 DOI: 10.1007/s13206-022-00076-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 07/15/2022] [Accepted: 07/18/2022] [Indexed: 11/30/2022]
Abstract
One-step homogeneous immunoassay was developed for detecting influenza viruses A and B (Inf-A and Inf-B) using the switching peptide H2. As the fluorescence-labeled switching peptide dissociated from the binding pocket of detection antibodies, the fluorescence signal could be directly generated by the binding of Inf-A and Inf-B without washing (i.e., one-step immunoassay). For the one-step homogeneous immunoassay with detection antibodies in solution, graphene was labeled with the antibodies as a fluorescence quencher. To test the feasibility of the homogeneous one-step immunoassay, the stability of the antibody complex with the switching peptide was evaluated under different pH and salt conditions. The one-step homogeneous immunoassay with switching peptide was conducted using influenza virus antigens in phosphate-buffered saline and real samples with inactivated Inf-A and Inf-B spiked in serum. Finally, the one-step homogeneous immunoassay results were compared with those of commercially available lateral flow immunoassays.
Collapse
Affiliation(s)
- Hong-Rae Kim
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-gu, Seoul, 03722 Korea
- Department of Chemistry, Texas A&M University, College Station, TX 77843 USA
| | - Ji-Hong Bong
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-gu, Seoul, 03722 Korea
| | - Tae-Hun Kim
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-gu, Seoul, 03722 Korea
| | - Seung-Shick Shin
- OPTOLANE Technologies Inc, 20 Pangyoyeok-ro 241beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do 13494 Republic of Korea
| | - Min-Jung Kang
- Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul, 02792 Republic of Korea
| | - Won-Bo Shim
- Department of Agricultural Chemistry and Food Science & Technology, Gyeongsang National University, Jinju, Korea
| | - Do Young Lee
- OPTOLANE Technologies Inc, 20 Pangyoyeok-ro 241beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do 13494 Republic of Korea
| | - Dong Hee Son
- Department of Chemistry, Texas A&M University, College Station, TX 77843 USA
| | - Jae-Chul Pyun
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-gu, Seoul, 03722 Korea
| |
Collapse
|
12
|
Kim HR, Bong JH, Kim TH, Choi KH, Shin SS, Kang MJ, Shim WB, Lee DY, Pyun JC. Homogeneous One-Step Immunoassay Based on Switching Peptides for Detection of the Influenza Virus. Anal Chem 2022; 94:9627-9635. [PMID: 35762898 DOI: 10.1021/acs.analchem.2c00716] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In this study, a homogeneous one-step immunoassay based on switching peptides is presented for the detection of influenza viruses A and B (Inf-A and Inf-B, respectively). The one-step immunoassay represents an immunoassay method that does not involve any washing steps, only treatment of the sample. In this method, fluorescence-labeled switching peptides quantitatively dissociate from the antigen-binding site of immunoglobulin G (IgG). In particular, the one-step immunoassay based on soluble detection antibodies with switching peptides is called a homogeneous one-step immunoassay. The immunoassay developed uses switching peptides labeled with two types of fluorescence dyes (FAM and TAMRA) and detection antibodies labeled with two types of fluorescence quenchers (TQ2 for FAM and TQ3 for TAMRA). The optimal switching peptides for the detection of Inf-A and Inf-B have been selected as L1-peptide and H2-peptide. The interactions between the four kinds of switching peptides and IgG have been analyzed using computational docking simulation and SPR biosensor. The location of labeling for the fluorescence quenchers has been determined based on the distance between the fluorescence dyes of the switching peptides and the fluorescence quenchers, calculated on the basis of the efficiency of fluorescence quenching, using the Förster equation. To demonstrate the feasibility of the one-step immunoassay, binding constants (KD) have been calculated for detection antibodies against Inf-A and Inf-B with target antigens (Inf-A and Inf-B) and switching peptides (L1- and H2-peptides), using an isotherm model. The immunoassay has been demonstrated to be feasible using antigens as well as real samples of Inf-A and Inf-B with a critical cycle number (Ct). The immunoassay has also been compared to other commercially available rapid test kits for Inf-A and Inf-B and found to be far more sensitive for detection of Inf-A and Inf-B over the entire detection range.
Collapse
Affiliation(s)
- Hong-Rae Kim
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Ji-Hong Bong
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Tae-Hun Kim
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Kyung-Hak Choi
- OPTOLANE Technologies Inc., 20 Pangyoyeok-ro 241beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do 13494, Republic of Korea
| | - Seung-Shick Shin
- OPTOLANE Technologies Inc., 20 Pangyoyeok-ro 241beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do 13494, Republic of Korea
| | - Min-Jung Kang
- Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Won-Bo Shim
- Department of Agricultural Chemistry and Food Science & Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Do Young Lee
- OPTOLANE Technologies Inc., 20 Pangyoyeok-ro 241beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do 13494, Republic of Korea
| | - Jae-Chul Pyun
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| |
Collapse
|
13
|
Lee JE, Kim SA, Mun H, Kim SR, Ha KS, Shim WB. A rapid and colorimetric loop-mediated isothermal amplification (LAMP) based on HRP-mimicking molecular beacon for the detection of major 6 Listeria species in enoki mushroom. Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108569] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
14
|
Hossen Toushik S, Park JH, Kim K, Ashrafudoulla M, Senakpon Isaie Ulrich M, Furkanur Rahman Mizan M, Kumar Roy P, Shim WB, Kim YM, Hong Park S, Ha SD. Antibiofilm efficacy of Leuconostoc mesenteroides J.27-derived postbiotic and food-grade essential oils against Vibrio parahaemolyticus, Pseudomonas aeruginosa, and Escherichia coli alone and in combination, and their application as a green preservative in the seafood industry. Food Res Int 2022; 156:111163. [DOI: 10.1016/j.foodres.2022.111163] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 03/14/2022] [Accepted: 03/15/2022] [Indexed: 02/01/2023]
|
15
|
Sung JS, Bong JH, Lee SJ, Jung J, Kang MJ, Lee M, Shim WB, Jose J, Pyun JC. One-step immunoassay for food allergens based on screened mimotopes from autodisplayed F V-antibody library. Biosens Bioelectron 2022; 202:113976. [PMID: 35042130 DOI: 10.1016/j.bios.2022.113976] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 12/21/2021] [Accepted: 01/06/2022] [Indexed: 02/07/2023]
Abstract
One-step immunoassay detects a target analyte simply by mixing a sample with a reagent solution without any washing steps. Herein, we present a one-step immunoassay that uses a peptide mimicking a target analyte (mimotope). The key idea of this strategy is that the mimotopes are screened from an autodisplayed FV-antibody library using monoclonal antibodies against target analytes. The monoclonal antibodies are bound to fluorescence-labeled mimotopes, which are quantitatively released into the solution when the target analytes are bound to the monoclonal antibodies. Thus, the target analyte is detected without any washing steps. For the mimotope screening, an FV-antibody library was exhibited on the outer membrane of E. coli with a diversity of >106 clones/library using autodisplay technology. The targeted clones were screened from the autodisplayed FV-antibody library using magnetic beads with immobilized monoclonal antibodies against food allergens. The analysis of binding properties of a control strain with mutant FV -antibodies composed of only CDR1 and CDR2 demonstrated that the CDR3 regions of the screened FV-antibodies showed binding affinity to food allergens. The CDR3 regions were synthesized into peptides as mimotopes for the corresponding food allergens (mackerel, peanuts, and pig fat). One-step immunoassays for food allergens were demonstrated using mimotopes against mackerel, peanut, and pig fat without any washing steps in solution without immobilization of antibodies to a solid support.
Collapse
Affiliation(s)
- Jeong Soo Sung
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-Gu, Seoul, 03722, South Korea
| | - Ji-Hong Bong
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-Gu, Seoul, 03722, South Korea
| | - Soo Jeong Lee
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-Gu, Seoul, 03722, South Korea
| | - Jaeyong Jung
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-Gu, Seoul, 03722, South Korea
| | - Min-Jung Kang
- Korea Institute of Science and Technology (KIST), Seoul, South Korea
| | - Misu Lee
- Institute for New Drug Development, College of Life Science and Bioengineering, Incheon National University, Incheon, 22012, Republic of Korea
| | - Won-Bo Shim
- Department of Food Science and Technology & Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, Gyeongnam, 52828, South Korea
| | - Joachim Jose
- Institute of Pharmaceutical and Medical Chemistry, Westfälischen Wilhelms-Universität Münster, Muenster, Germany
| | - Jae-Chul Pyun
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-Gu, Seoul, 03722, South Korea.
| |
Collapse
|
16
|
Kim D, Jin B, Kim SA, Choi W, Shin S, Park J, Shim WB, Kim K, Lee JS. An Ultrasensitive Silicon-Based Electrolyte-Gated Transistor for the Detection of Peanut Allergens. Biosensors 2022; 12:bios12010024. [PMID: 35049652 PMCID: PMC8773534 DOI: 10.3390/bios12010024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 12/31/2021] [Accepted: 12/31/2021] [Indexed: 11/28/2022]
Abstract
The highly sensitive detection of peanut allergens (PAs) using silicon-based electrolyte-gated transistors (Si-EGTs) was demonstrated. The Si-EGT was made using a top-down technique. The fabricated Si-EGT showed excellent intrinsic electrical characteristics, including a low threshold voltage of 0.7 V, low subthreshold swing of <70 mV/dec, and low gate leakage of <10 pA. Surface functionalization and immobilization of antibodies were performed for the selective detection of PAs. The voltage-related sensitivity (SV) showed a constant behavior from the subthreshold regime to the linear regime. The current-related sensitivity (SI) was high in the subthreshold regime and then significantly decreased as the drain current increased. The limit of detection (LOD) was calculated to be as low as 25 pg/mL based on SI characteristics, which is the lowest value reported to date in the literature for various sensor methodologies. The Si-EGT showed selective detection of PA through a non-specific control test. These results confirm that Si-EGT is a high-sensitivity and low-power biosensor for PA detection.
Collapse
Affiliation(s)
- Donghoon Kim
- Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea; (D.K.); (B.J.); (W.C.); (S.S.); (J.P.)
| | - Bo Jin
- Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea; (D.K.); (B.J.); (W.C.); (S.S.); (J.P.)
- Research and Development Department, Innovative General Electronic Sensor Technology Co., Itd. (IGEST), Pohang 37673, Korea
| | - Sol-A Kim
- Division of Applied Life Science, Graduate School, Gyeongsang National University, Jinju 52828, Korea;
| | - Wonyeong Choi
- Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea; (D.K.); (B.J.); (W.C.); (S.S.); (J.P.)
| | - Seonghwan Shin
- Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea; (D.K.); (B.J.); (W.C.); (S.S.); (J.P.)
| | - Jiwon Park
- Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea; (D.K.); (B.J.); (W.C.); (S.S.); (J.P.)
| | - Won-Bo Shim
- Department of Food Science and Technology, Gyeongsang National University, Jinju 52828, Korea;
| | - Kihyun Kim
- Division of Electronics Engineering, Jeonbuk National University, Jeonju 54896, Korea
- Future Semiconductor Convergence Technology Research Center and ICT Convergence Research Center, Jeonbuk National University, Jeonju 54896, Korea
- Correspondence: (K.K.); (J.-S.L.)
| | - Jeong-Soo Lee
- Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea; (D.K.); (B.J.); (W.C.); (S.S.); (J.P.)
- Correspondence: (K.K.); (J.-S.L.)
| |
Collapse
|
17
|
Jian Y, Shim WB, Ma Z. Multiple functions of SWI/SNF chromatin remodeling complex in plant-pathogen interactions. Stress Biol 2021; 1:18. [PMID: 37676626 PMCID: PMC10442046 DOI: 10.1007/s44154-021-00019-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Accepted: 11/22/2021] [Indexed: 09/08/2023]
Abstract
The SWI/SNF chromatin remodeling complex utilizes the energy of ATP hydrolysis to facilitate chromatin access and plays essential roles in DNA-based events. Studies in animals, plants and fungi have uncovered sophisticated regulatory mechanisms of this complex that govern development and various stress responses. In this review, we summarize the composition of SWI/SNF complex in eukaryotes and discuss multiple functions of the SWI/SNF complex in regulating gene transcription, mRNA splicing, and DNA damage response. Our review further highlights the importance of SWI/SNF complex in regulating plant immunity responses and fungal pathogenesis. Finally, the potentials in exploiting chromatin remodeling for management of crop disease are presented.
Collapse
Affiliation(s)
- Yunqing Jian
- State Key Laboratory of Rice Biology, and Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Biotechnology, Zhejiang University, Hangzhou, China
| | - Won-Bo Shim
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX, USA
| | - Zhonghua Ma
- State Key Laboratory of Rice Biology, and Key Laboratory of Molecular Biology of Crop Pathogens and Insects, Institute of Biotechnology, Zhejiang University, Hangzhou, China.
| |
Collapse
|
18
|
Park YS, Borrego EJ, Gao X, Christensen SA, Schmelz E, Lanubile A, Drab DA, Cody W, Yan H, Shim WB, Kolomiets MV. Fusarium verticillioides Induces Maize-Derived Ethylene to Promote Virulence by Engaging Fungal G-Protein Signaling. Mol Plant Microbe Interact 2021; 34:1157-1166. [PMID: 34165327 DOI: 10.1094/mpmi-09-20-0250-r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Seed maceration and contamination with mycotoxin fumonisin inflicted by Fusarium verticillioides is a major disease concern for maize producers worldwide. Meta-analyses of quantitative trait loci for Fusarium ear rot resistance uncovered several ethylene (ET) biosynthesis and signaling genes within them, implicating ET in maize interactions with F. verticillioides. We tested this hypothesis using maize knockout mutants of the 1-aminocyclopropane-1-carboxylate (ACC) synthases ZmACS2 and ZmACS6. Infected wild-type seed emitted five-fold higher ET levels compared with controls, whereas ET was abolished in the acs2 and acs6 single and double mutants. The mutants supported reduced fungal biomass, conidia, and fumonisin content. Normal susceptibility was restored in the acs6 mutant with exogenous treatment of ET precursor ACC. Subsequently, we showed that fungal G-protein signaling is required for virulence via induction of maize-produced ET. F. verticillioides Gβ subunit and two regulators of G-protein signaling mutants displayed reduced seed colonization and decreased ET levels. These defects were rescued by exogenous application of ACC. We concluded that pathogen-induced ET facilitates F. verticillioides colonization of seed, and, in turn, host ET production is manipulated via G-protein signaling of F. verticillioides to facilitate pathogenesis.[Formula: see text] Copyright © 2021 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
Collapse
Affiliation(s)
- Yong-Soon Park
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843-2132, U.S.A
| | - Eli J Borrego
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843-2132, U.S.A
| | - Xiquan Gao
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843-2132, U.S.A
| | - Shawn A Christensen
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843-2132, U.S.A
- Chemistry Unit, Center of Medical, Agricultural, and Veterinary Entomology, United States Department of Agriculture, Gainesville, FL 32608, U.S.A
| | - Eric Schmelz
- Chemistry Unit, Center of Medical, Agricultural, and Veterinary Entomology, United States Department of Agriculture, Gainesville, FL 32608, U.S.A
| | - Alessandra Lanubile
- Department of Sustainable Crop Production, Università Cattolica del Sacro Cuore, Piacenza, Italy
| | - Dillon A Drab
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843-2132, U.S.A
| | - Will Cody
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843-2132, U.S.A
| | - Huijuan Yan
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843-2132, U.S.A
| | - Won-Bo Shim
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843-2132, U.S.A
| | - Michael V Kolomiets
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843-2132, U.S.A
| |
Collapse
|
19
|
Roy PK, Mizan MFR, Hossain MI, Han N, Nahar S, Ashrafudoulla M, Toushik SH, Shim WB, Kim YM, Ha SD. Elimination of Vibrio parahaemolyticus biofilms on crab and shrimp surfaces using ultraviolet C irradiation coupled with sodium hypochlorite and slightly acidic electrolyzed water. Food Control 2021. [DOI: 10.1016/j.foodcont.2021.108179] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
20
|
Bong JH, Kim HR, Yoo JW, Kang MJ, Shin MG, Lee JS, Shim WB, Lee SD, Pyun JC. One-step immunoassay without washing steps for influenza A virus detection using ISFET. Biosens Bioelectron 2020; 165:112341. [DOI: 10.1016/j.bios.2020.112341] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 05/27/2020] [Accepted: 05/29/2020] [Indexed: 01/07/2023]
|
21
|
Lee JE, Mun H, Kim SR, Kim MG, Chang JY, Shim WB. A colorimetric Loop-mediated isothermal amplification (LAMP) assay based on HRP-mimicking molecular beacon for the rapid detection of Vibrio parahaemolyticus. Biosens Bioelectron 2020; 151:111968. [DOI: 10.1016/j.bios.2019.111968] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Revised: 11/21/2019] [Accepted: 12/14/2019] [Indexed: 12/20/2022]
|
22
|
Fan G, Zhang K, Zhang J, Yang J, Yang X, Hu Y, Huang J, Zhu Y, Yu W, Hu H, Wang B, Shim W, Lu GD. The transcription factor FgMed1 is involved in early conidiogenesis and DON biosynthesis in the plant pathogenic fungus Fusarium graminearum. Appl Microbiol Biotechnol 2019; 103:5851-5865. [PMID: 31115634 DOI: 10.1007/s00253-019-09872-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Revised: 04/17/2019] [Accepted: 04/24/2019] [Indexed: 12/27/2022]
Abstract
Fusarium graminearum is a prominent fungal pathogen that causes economically important losses by infesting a wide variety of cereal crops. F. graminearum produces both asexual and sexual spores which disseminate and inoculate hosts. Therefore, to better understand the disease cycle and to develop strategies to improve disease management, it is important to further clarify molecular mechanisms of F. graminearum conidiogenesis. In this study, we functionally characterized the FgMed1, a gene encoding an ortholog of a conserved MedA transcription factor known to be a key conidiogenesis regulator in Aspergillus nidulans. The gene deletion mutants ΔFgMed1 produced significantly less conidia, and these were generated from abnormal conidiophores devoid of phialides. Additionally, we observed defective sexual development along with reduced virulence and deoxynivalenol (DON) production in ΔFgMed1. The GFP-tagged FgMed1 protein localized to the nuclei of conidiophores and phialides during early conidiogenesis. Significantly, RNA-Seq analyses showed that a number of the conidiation- and toxin-related genes are differentially expressed in the ΔFgMed1 mutant in early conidiogenesis. These data strongly suggest that FgMed1 involved in regulation of genes associated with early conidiogenesis, DON production, and virulence in F. graminearum.
Collapse
Affiliation(s)
- Gaili Fan
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, and Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China.,Xiamen Greening Administration Center, Xiamen, 361004, Fujian, China
| | - Kai Zhang
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.,College of Plant Protection, China Agricultural University, Beijing, 100193, China
| | - Jing Zhang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, and Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China
| | - Jie Yang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, and Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China
| | - Xiaoshuang Yang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, and Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China
| | - Yanpei Hu
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, and Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China
| | - Jiawei Huang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, and Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China
| | - Yangyan Zhu
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, and Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China
| | - Wenying Yu
- Fujian Province Key Laboratory of Pathogenic Fungi and Mycotoxins, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Hongli Hu
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, and Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China
| | - Baohua Wang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, and Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China
| | - WonBo Shim
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX, 77843, USA
| | - Guo-Dong Lu
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, and Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China.
| |
Collapse
|
23
|
Yun Y, Zhou X, Yang S, Wen Y, You H, Zheng Y, Norvienyeku J, Shim WB, Wang Z. Fusarium oxysporum f. sp. lycopersici C 2H 2 transcription factor FolCzf1 is required for conidiation, fusaric acid production, and early host infection. Curr Genet 2019; 65:773-783. [PMID: 30631890 DOI: 10.1007/s00294-019-00931-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2018] [Revised: 12/21/2018] [Accepted: 01/03/2019] [Indexed: 11/26/2022]
Abstract
The soil-borne, asexual fungus Fusarium oxysporum f.sp. lycopersici (Fol) is a causal agent of tomato wilt disease. The infection process of Fol comprises root recognition, adhesion, penetration, colonization of the root cortex and hyphal proliferation within the xylem vessels, which are under the regulation of virulence-involved transcription factors (TFs). In this study, we identified a gene, designated FolCZF1, which encodes a C2H2 TF in Fol. The homologs of FolCzf1 are also known to affect pathogenicity in F. graminearum and Magnaporthe oryzae on wheat and rice, respectively. We learned that FolCZF1 transcript level is upregulated in conidia and early host infection stage, which led us to hypothesize that FolCzf1 is associated with early host infection in Fol. The FolCZF1 deletion mutant (ΔFolCZF1) exhibited defects in growth rate, conidiation, conidia morphology and a complete loss of virulence on tomato root. Further microscopic observation showed that ΔFolCZF1 can penetrate the root but the primary infection hypha cannot extend its colonization inside the host tissue, suggesting that FolCzf1 TF plays an important role in early infection. Fusaric acid, a secondary metabolite produced by Fusarium species, is suggested as a virulence factor in many crop diseases. We found that FolCzf1 plays a critical role in fusaric acid production by regulating the expression of fusaric acid biosynthesis genes. In summary, FolCzf1 is required for conidiation, secondary metabolism, and early host infection in Fol, and we propose that homologs of FolCzf1 are required for early parasitic growth in other plant pathogenic filamentous fungi.
Collapse
Affiliation(s)
- Yingzi Yun
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China.
| | - Xin Zhou
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Shuai Yang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Ya Wen
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Haixia You
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yuru Zheng
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
- Fujian Institute for Food and Drug Quality Control, Fuzhou, China
| | - Justice Norvienyeku
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Won-Bo Shim
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China.
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX, USA.
| | - Zonghua Wang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, China.
- Institute of Oceanography, Minjiang University, Fuzhou, China.
| |
Collapse
|
24
|
Batule BS, Kim SU, Mun H, Choi C, Shim WB, Kim MG. Colorimetric Detection of Norovirus in Oyster Samples through DNAzyme as a Signaling Probe. J Agric Food Chem 2018; 66:3003-3008. [PMID: 29381353 DOI: 10.1021/acs.jafc.7b05289] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Worldwide, norovirus is one of the most associated causes of acute gastroenteritis, which leads to nearly 50 000 child deaths every year in developing countries. Therefore, there is great demand to develop a rapid, low-cost, and accurate detection assay for the foodborne norovirus infection to reduce mortality caused by norovirus. Considering the importance of norovirus, we have demonstrated a highly sensitive and specific colorimetric detection method for analysis of human norovirus genogroups I and II (HuNoV GI and GII) in oyster samples. This is the first report to employ colorimetric HRPzyme-integrated polymerase chain reaction (PCR) for direct norovirus detection from the real shellfish samples. We found that the HRPzyme-integrated PCR method is more sensitive than the gel electrophoresis approach and could detect the HuNoV GI and GII genome up to 1 copy/mL. The specificity of the proposed method was successfully demonstrated for HuNoV GI and GII. Further, we performed testing HuNoVs in the spiked oyster samples, and the HRPzyme-integrated PCR method proved to be an ultrasensitive and selective method for detecting HuNoVs in the real samples. By integration of the proposed method with the portable PCR machine, it would be more reliable to improve food safety by detecting HuNoVs in the different types of shellfish, such as oyster and mussel, at the production field.
Collapse
Affiliation(s)
| | | | | | - Changsun Choi
- Department of Food and Nutrition, College of Biotechnology and Natural Resources , Chung-Ang University , Anseong , Gyounggi 17546 , Republic of Korea
| | - Won-Bo Shim
- Department of Agricultural Chemistry and Food Science and Technology , Gyeongsang National University , 900 Gajwa-dong , Jinju , Gyeongnam 660-701 , Republic of Korea
| | | |
Collapse
|
25
|
Kim M, Zhang H, Woloshuk C, Shim WB, Yoon BJ. Computational Prediction of Pathogenic Network Modules in Fusarium verticillioides. IEEE/ACM Trans Comput Biol Bioinform 2018; 15:506-515. [PMID: 29610099 DOI: 10.1109/tcbb.2015.2440232] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Fusarium verticillioides is a fungal pathogen that triggers stalk rots and ear rots in maize. In this study, we performed a comparative analysis of wild type and loss-of-virulence mutant F. verticillioides co-expression networks to identify subnetwork modules that are associated with its pathogenicity. We constructed the F. verticillioides co-expression networks from RNA-Seq data and searched through these networks to identify subnetwork modules that are differentially activated between the wild type and mutant F. verticillioides, which considerably differ in terms of pathogenic potentials. A greedy seed-and-extend approach was utilized in our search, where we also used an efficient branch-out technique for reliable prediction of functional subnetwork modules in the fungus. Through our analysis, we identified four potential pathogenicity-associated subnetwork modules, each of which consists of interacting genes with coordinated expression patterns, but whose activation level is significantly different in the wild type and the mutant. The predicted modules were comprised of functionally coherent genes and topologically cohesive. Furthermore, they contained several orthologs of known pathogenic genes in other fungi, which may play important roles in the fungal pathogenesis.
Collapse
|
26
|
Kim SU, Batule BS, Mun H, Shim WB, Kim MG. Ultrasensitive colorimetric detection of Salmonella enterica Typhimurium on lettuce leaves by HRPzyme-Integrated polymerase chain reaction. Food Control 2018. [DOI: 10.1016/j.foodcont.2017.09.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
27
|
Lee JY, Park JH, Mun H, Shim WB, Lim SH, Kim MG. Quantitative analysis of lard in animal fat mixture using visible Raman spectroscopy. Food Chem 2018; 254:109-114. [PMID: 29548429 DOI: 10.1016/j.foodchem.2018.01.185] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 01/29/2018] [Accepted: 01/30/2018] [Indexed: 01/25/2023]
Abstract
Food adulteration is a serious issue that requires verification and strict management due to healthcare, morality, and social value problems. In the context of fat, food manufacturers blend lard with vegetable oils or animal fats for convenience and gaining economic benefits. Thus, we herein report the classification of 4 animal fats, e.g., beef tallow, pork lard, chicken fat, duck oil, using Raman spectroscopy combined with simple calculation of intensity ratios of Raman signal at vibrational modes corresponding to unsaturated fatty acids and total fatty acids. Various calculated values of the species were compared to find a feature that is able to classify each fats using Raman peak ratio. As a result, we suggested "Oil gauge (OG)" as a standard feature for classification of the fats in Raman analysis field. Furthermore, a quantification of the lard in other fat was accomplished with good linear correlation using the OG values.
Collapse
Affiliation(s)
- Ju-Yong Lee
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
| | - Jin-Ho Park
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
| | - Hyoyoung Mun
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
| | - Won-Bo Shim
- Department of Food Science and Technology, Gyeongsang National University, Jinju 52727, Republic of Korea.
| | - Sang-Hyun Lim
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
| | - Min-Gon Kim
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
| |
Collapse
|
28
|
Kim SU, Batule BS, Mun H, Byun JY, Shim WB, Kim MG. Colorimetric molecular diagnosis of the HIV gag gene using DNAzyme and a complementary DNA-extended primer. Analyst 2018; 143:695-699. [PMID: 29299545 DOI: 10.1039/c7an01520h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We have developed a novel strategy for the colorimetric detection of PCR products by utilizing a target-specific primer modified at the 5'-end with an anti-DNAzyme sequence. A single-stranded DNAzyme sequence folds into a G-quadruplex structure with hemin and shows strong peroxidase activity. When the complementary strand binds to the DNAzyme sequence, it blocks the formation of the G-quadraduplex structure and loses its peroxidase activity. In the presence of the target gene, PCR amplification proceeds, and anti-DNAzyme sequence modified primers present in the reaction mixture form a double strand through primer extension. Therefore, it does not block the DNAzyme sequence. Further, a colorimetric signal is generated by the addition of 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) and H2O2 at the end of the reaction. We have successfully detected a single copy of the HIV type 1 gag gene in buffer and 10 copies in human serum. The strategy developed could be used to detect DNA and RNA in complex biological samples by simple primer designing that includes DNAzyme and a DNA extended primer.
Collapse
Affiliation(s)
- Seong U Kim
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, 261 Chemdan-gwagiro, Gwangju 500-712, Republic of Korea.
| | - Bhagwan S Batule
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology, 261 Chemdan-gwagiro, Gwangju 500-712, Republic of Korea
| | - Hyoyoung Mun
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology, 261 Chemdan-gwagiro, Gwangju 500-712, Republic of Korea
| | - Ju-Young Byun
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology, 261 Chemdan-gwagiro, Gwangju 500-712, Republic of Korea
| | - Won-Bo Shim
- Department of Agricultural Chemistry and Food Science and Technology, Gyeongsang National University, 900 Gajwa-dong Jinju, Gyeongnam 660-701, Republic of Korea
| | - Min-Gon Kim
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, 261 Chemdan-gwagiro, Gwangju 500-712, Republic of Korea. and Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology, 261 Chemdan-gwagiro, Gwangju 500-712, Republic of Korea
| |
Collapse
|
29
|
Yun B, An HM, Shim WB, Kim WI, Hung NB, Han S, Kim HJ, Lee S, Kim SR. Development of a Screening Method and Device for the Detection of Escherichia coli from Agri-Food Production Environments and Fresh Produce. J Microbiol Biotechnol 2017; 27:2141-2150. [PMID: 29092389 DOI: 10.4014/jmb.1709.09019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
This study was conducted to develop a screening method using Colilert-18 and a device for the detection of E. coli from agri-food production environments and fresh vegetables. The specificity and sensitivity of Colilert-18 by temperature (37°C and 44°C) were evaluated with 38 E. coli and 78 non-E. coli strains. The false-positive rate was 3.8% (3/78) and 0% (0/78) at 37°C and 44°C, respectively. The detection limit of E. coli at 37°C at <1.0 log CFU/250 ml was lower than that at 44°C. The efficiency of the developed device, which comprised an incubator equipped with a UV lamp to detect E. coli in the field, was evaluated by measuring the temperature and UV lamp brightness. The difference between the set temperature and actual temperature of the developed device was about 1.0°C. When applying the developed method and device to various samples, including utensils, gloves, irrigation water, seeds, and vegetables, there were no differences in detection rates of E. coli compared with the Korean Food Code method. For sanitary disposal of culture samples after experiments, the sterilization effect of sodium dichloroisocyanurate (NaDCC) tablets was assessed for use as a substitute for an autoclave. The addition of one tablet of NaDCC per 50 ml was sufficient to kill E. coli cultured in Colilert-18. These results show that the developed protocol and device can efficiently detect E. coli from agri-food production environments and vegetables.
Collapse
Affiliation(s)
- Bohyun Yun
- Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institution of Agricultural Science, Rural Development Administration, Wanju 55365, Republic of Korea
| | - Hyun-Mi An
- Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institution of Agricultural Science, Rural Development Administration, Wanju 55365, Republic of Korea
| | - Won-Bo Shim
- Department of Agricultural Chemistry and Food Science & Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Won-Il Kim
- Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institution of Agricultural Science, Rural Development Administration, Wanju 55365, Republic of Korea
| | - Nguyen Bao Hung
- Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institution of Agricultural Science, Rural Development Administration, Wanju 55365, Republic of Korea
| | - Sanghyun Han
- Division of Research Policy, Research Policy Bureau, Rural Development Administration, Jeonju 54875, Republic of Korea
| | - Hyun-Ju Kim
- Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institution of Agricultural Science, Rural Development Administration, Wanju 55365, Republic of Korea
| | - Seungdon Lee
- Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institution of Agricultural Science, Rural Development Administration, Wanju 55365, Republic of Korea
| | - Se-Ri Kim
- Microbial Safety Team, Agro-Food Safety & Crop Protection Department, National Institution of Agricultural Science, Rural Development Administration, Wanju 55365, Republic of Korea
| |
Collapse
|
30
|
Hilton A, Zhang H, Yu W, Shim WB. Identification and Characterization of Pathogenic and Endophytic Fungal Species Associated with Pokkah Boeng Disease of Sugarcane. Plant Pathol J 2017; 33:238-248. [PMID: 28592943 PMCID: PMC5461043 DOI: 10.5423/ppj.oa.02.2017.0029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 03/13/2017] [Accepted: 03/20/2017] [Indexed: 05/21/2023]
Abstract
Pokkah Boeng is a serious disease of sugarcane, which can lead to devastating yield losses in crop-producing regions, including southern China. However, there is still uncertainty about the causal agent of the disease. Our aim was to isolate and characterize the pathogen through morphological, physiological, and molecular analyses. We isolated sugarcane-colonizing fungi in Fujian, China. Isolated fungi were first assessed for their cell wall degrading enzyme capabilities, and five isolates were identified for further analysis. Internal transcribed spacer sequencing revealed that these five strains are Fusarium, Alternaria, Phoma, Phomopsis, and Epicoccum. The Fusarium isolate was further identified as F. verticillioides after Calmodulin and EF-1α gene sequencing and microscopic morphology study. Pathogenicity assay confirmed that F. verticillioides was directly responsible for disease on sugarcane. Co-inoculation of F. verticillioides with other isolated fungi did not lead to a significant difference in disease severity, refuting the idea that other cellulolytic fungi can increase disease severity as an endophyte. This is the first report characterizing pathogenic F. verticillioides on sugarcane in southern China.
Collapse
Affiliation(s)
- Angelyn Hilton
- Department of Plant Pathology & Microbiology, Texas A&M University, College Station, TX 77843-2132,
USA
| | - Huanming Zhang
- Bioenvironmental Science, Texas A&M University, College Station, TX 77843-2132,
USA
| | - Wenying Yu
- College of Life Sciences, Fujian Agricultural and Forestry University, Fuzhou 350002, People’s Republic of
China
| | - Won-Bo Shim
- Department of Plant Pathology & Microbiology, Texas A&M University, College Station, TX 77843-2132,
USA
- Bioenvironmental Science, Texas A&M University, College Station, TX 77843-2132,
USA
- Corresponding author: Phone) +1-979-458-2190, FAX) +1-979-845-6483, E-mail)
| |
Collapse
|
31
|
Affiliation(s)
- Won-Bo Shim
- Department of Plant Pathology and Microbiology, The Program for the Biology of Filamentous Fungi, Texas A&M University, College Station, Texas 77843-2132
| | - Larry D. Dunkle
- Crop Production and Pest Control Research, U.S. Department of Agriculture-Agricultural Research Service, Department of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana 47907-2054
| |
Collapse
|
32
|
Wang CL, Shim WB, Shaw BD. The Colletotrichum graminicola striatin orthologue Str1 is necessary for anastomosis and is a virulence factor. Mol Plant Pathol 2016; 17:931-42. [PMID: 26576029 PMCID: PMC6638439 DOI: 10.1111/mpp.12339] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 10/19/2015] [Accepted: 10/20/2015] [Indexed: 05/24/2023]
Abstract
Striatin family proteins are key regulators in signalling pathways in fungi and animals. These scaffold proteins contain four conserved domains: a caveolin-binding domain, a coiled-coil motif and a calmodulin-binding domain at the N-terminus, and a WD-repeat domain at the C-terminus. Fungal striatin orthologues are associated with sexual development, hyphal growth and plant pathogenesis. In Fusarium verticillioides, the striatin orthologue Fsr1 promotes virulence in the maize stalk. The relationship between fungal striatins and pathogenicity remains largely unexplored. In this study, we demonstrate that the Colletotrichum graminicola striatin orthologue Str1 is required for full stalk rot and leaf blight virulence in maize. Pathogenicity assays show that the striatin mutant strain (Δstr1) produces functional appressoria, but infection and colonization are attenuated. Additional phenotypes of the Δstr1 mutant include reduced radial growth and compromised hyphal fusion. In comparison with the wild-type, Δstr1 also shows a defect in sexual development and produces fewer and shorter conidia. Together with the fact that F. verticillioides fsr1 can complement Δstr1, our results indicate that C. graminicola Str1 shares five phenotypes with striatin orthologues in other fungal species: hyphal growth, hyphal fusion, conidiation, sexual development and virulence. We propose that fungal striatins, like mammalian striatins, act as scaffolding molecules that cross-link multiple signal transduction pathways.
Collapse
Affiliation(s)
- Chih-Li Wang
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station 77843-2132, TX, USA
- Department of Plant Pathology, National Chung Hsing University, Taichung 40227, Taiwan
| | - Won-Bo Shim
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station 77843-2132, TX, USA
| | - Brian D Shaw
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station 77843-2132, TX, USA
| |
Collapse
|
33
|
Zheng W, Zheng H, Zhao X, Zhang Y, Xie Q, Lin X, Chen A, Yu W, Lu G, Shim WB, Zhou J, Wang Z. Retrograde trafficking from the endosome to the trans-Golgi network mediated by the retromer is required for fungal development and pathogenicity in Fusarium graminearum. New Phytol 2016; 210:1327-1343. [PMID: 26875543 DOI: 10.1111/nph.13867] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 12/16/2015] [Indexed: 06/05/2023]
Abstract
In eukaryotes, the retromer is an endosome-localized complex involved in protein retrograde transport. However, the role of such intracellular trafficking events in pathogenic fungal development and pathogenicity remains unclear. The role of the retromer complex in Fusarium graminearum was investigated using cell biological and genetic methods. We observed the retromer core component FgVps35 (Vacuolar Protein Sorting 35) in the cytoplasm as fast-moving puncta. FgVps35-GFP co-localized with both early and late endosomes, and associated with the trans-Golgi network (TGN), suggesting that FgVps35 functions at the donor endosome membrane to mediate TGN trafficking. Disruption of microtubules with nocodazole significantly restricted the transportation of FgVps35-GFP and resulted in severe germination and growth defects. Mutation of FgVPS35 not only mimicked growth defects induced by pharmacological treatment, but also affected conidiation, ascospore formation and pathogenicity. Using yeast two-hybrid assays, we determined the interactions among FgVps35, FgVps26, FgVps29, FgVps17 and FgVps5 which are analogous to the yeast retromer complex components. Deletion of any one of these genes resulted in similar phenotypic defects to those of the ΔFgvps35 mutant and disrupted the stability of the complex. Overall, our results provide the first clear evidence of linkage between the retrograde transport mediated by the retromer complex and virulence in F. graminearum.
Collapse
Affiliation(s)
- Wenhui Zheng
- Fujian Province Key Laboratory of Pathogenic Fungi and Mycotoxins, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Huawei Zheng
- Fujian Province Key Laboratory of Pathogenic Fungi and Mycotoxins, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Xu Zhao
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Ying Zhang
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Qiurong Xie
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Xiaolian Lin
- Fujian Province Key Laboratory of Pathogenic Fungi and Mycotoxins, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Ahai Chen
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Wenying Yu
- Fujian Province Key Laboratory of Pathogenic Fungi and Mycotoxins, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Guodong Lu
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Won-Bo Shim
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX, 77843-2132, USA
| | - Jie Zhou
- Fujian Province Key Laboratory of Pathogenic Fungi and Mycotoxins, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Zonghua Wang
- Fujian Province Key Laboratory of Pathogenic Fungi and Mycotoxins, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| |
Collapse
|
34
|
Jo EJ, Mun H, Kim SJ, Shim WB, Kim MG. Detection of ochratoxin A (OTA) in coffee using chemiluminescence resonance energy transfer (CRET) aptasensor. Food Chem 2016; 194:1102-7. [DOI: 10.1016/j.foodchem.2015.07.152] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Revised: 03/23/2015] [Accepted: 07/07/2015] [Indexed: 12/13/2022]
|
35
|
Abstract
A compact on-chip first-in first-out droplet incubation chamber enables an equal droplet incubation time for a large number of droplets.
Collapse
Affiliation(s)
- Jing Dai
- Department of Electrical and Computer Engineering
- Texas A&M University
- College Station
- USA
| | - Hyun Soo Kim
- Department of Electrical and Computer Engineering
- Texas A&M University
- College Station
- USA
| | - Adrian Ryan Guzman
- Department of Electrical and Computer Engineering
- Texas A&M University
- College Station
- USA
| | - Won-Bo Shim
- Department of Plant Pathology and Microbiology
- Texas A&M University
- College Station
- USA
| | - Arum Han
- Department of Electrical and Computer Engineering
- Texas A&M University
- College Station
- USA
- Department of Biomedical Engineering
| |
Collapse
|
36
|
Zhang C, Wang J, Tao H, Dang X, Wang Y, Chen M, Zhai Z, Yu W, Xu L, Shim WB, Lu G, Wang Z. FvBck1, a component of cell wall integrity MAP kinase pathway, is required for virulence and oxidative stress response in sugarcane Pokkah Boeng pathogen. Front Microbiol 2015; 6:1096. [PMID: 26500635 PMCID: PMC4597114 DOI: 10.3389/fmicb.2015.01096] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 09/22/2015] [Indexed: 11/13/2022] Open
Abstract
Fusarium verticillioides (formerly F. moniliforme) is suggested as one of the causal agents of Pokkah Boeng, a serious disease of sugarcane worldwide. Currently, detailed molecular and physiological mechanism of pathogenesis is unknown. In this study, we focused on cell wall integrity MAPK pathway as one of the potential signaling mechanisms associated with Pokkah Boeng pathogenesis. We identified FvBCK1 gene that encodes a MAP kinase kinase kinase homolog and determined that it is not only required for growth, micro- and macro-conidia production, and cell wall integrity but also for response to osmotic and oxidative stresses. The deletion of FvBCK1 caused a significant reduction in virulence and FB1 production, a possibly carcinogenic mycotoxin produced by the fungus. Moreover, we found the expression levels of three genes, which are known to be involved in superoxide scavenging, were down regulated in the mutant. We hypothesized that the loss of superoxide scavenging capacity was one of the reasons for reduced virulence, but overexpression of catalase or peroxidase gene failed to restore the virulence defect in the deletion mutant. When we introduced Magnaporthe oryzae MCK1 into the FvBck1 deletion mutant, while certain phenotypes were restored, the complemented strain failed to gain full virulence. In summary, FvBck1 plays a diverse role in F. verticillioides, and detailed investigation of downstream signaling pathways will lead to a better understanding of how this MAPK pathway regulates Pokkah Boeng on sugarcane.
Collapse
Affiliation(s)
- Chengkang Zhang
- Fujian Province Key Laboratory of Pathogenic Fungi and Mycotoxins, College of Life Sciences, Fujian Agriculture and Forestry UniversityFuzhou, China
| | - Jianqiang Wang
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, Fujian Agriculture and Forestry UniversityFuzhou, China
| | - Hong Tao
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, Fujian Agriculture and Forestry UniversityFuzhou, China
| | - Xie Dang
- Fujian Province Key Laboratory of Pathogenic Fungi and Mycotoxins, College of Life Sciences, Fujian Agriculture and Forestry UniversityFuzhou, China
| | - Yang Wang
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, Fujian Agriculture and Forestry UniversityFuzhou, China
| | - Miaoping Chen
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, Fujian Agriculture and Forestry UniversityFuzhou, China
| | - Zhenzhen Zhai
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, Fujian Agriculture and Forestry UniversityFuzhou, China
| | - Wenying Yu
- Fujian Province Key Laboratory of Pathogenic Fungi and Mycotoxins, College of Life Sciences, Fujian Agriculture and Forestry UniversityFuzhou, China
| | - Liping Xu
- Key Laboratory of Sugarcane Biology and Genetic Breeding, Ministry of Agriculture, Fujian Agriculture and Forestry UniversityFuzhou, China
| | - Won-Bo Shim
- Department of Plant Pathology and Microbiology, Texas A&M UniversityCollege Station, TX, USA
| | - Guodong Lu
- Fujian Province Key Laboratory of Pathogenic Fungi and Mycotoxins, College of Life Sciences, Fujian Agriculture and Forestry UniversityFuzhou, China
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, Fujian Agriculture and Forestry UniversityFuzhou, China
| | - Zonghua Wang
- Fujian Province Key Laboratory of Pathogenic Fungi and Mycotoxins, College of Life Sciences, Fujian Agriculture and Forestry UniversityFuzhou, China
- Fujian University Key Laboratory for Functional Genomics of Plant Fungal Pathogens, Fujian Agriculture and Forestry UniversityFuzhou, China
| |
Collapse
|
37
|
Kim M, Zhang H, Woloshuk C, Shim WB, Yoon BJ. Computational identification of genetic subnetwork modules associated with maize defense response to Fusarium verticillioides. BMC Bioinformatics 2015; 16 Suppl 13:S12. [PMID: 26423221 PMCID: PMC4597171 DOI: 10.1186/1471-2105-16-s13-s12] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Background Maize, a crop of global significance, is vulnerable to a variety of biotic stresses resulting in economic losses. Fusarium verticillioides (teleomorph Gibberella moniliformis) is one of the key fungal pathogens of maize, causing ear rots and stalk rots. To better understand the genetic mechanisms involved in maize defense as well as F. verticillioides virulence, a systematic investigation of the host-pathogen interaction is needed. The aim of this study was to computationally identify potential maize subnetwork modules associated with its defense response against F. verticillioides. Results We obtained time-course RNA-seq data from B73 maize inoculated with wild type F. verticillioides and a loss-of-virulence mutant, and subsequently established a computational pipeline for network-based comparative analysis. Specifically, we first analyzed the RNA-seq data by a cointegration-correlation-expression approach, where maize genes were jointly analyzed with known F. verticillioides virulence genes to find candidate maize genes likely associated with the defense mechanism. We predicted maize co-expression networks around the selected maize candidate genes based on partial correlation, and subsequently searched for subnetwork modules that were differentially activated when inoculated with two different fungal strains. Based on our analysis pipeline, we identified four potential maize defense subnetwork modules. Two were directly associated with maize defense response and were associated with significant GO terms such as GO:0009817 (defense response to fungus) and GO:0009620 (response to fungus). The other two predicted modules were indirectly involved in the defense response, where the most significant GO terms associated with these modules were GO:0046914 (transition metal ion binding) and GO:0046686 (response to cadmium ion). Conclusion Through our RNA-seq data analysis, we have shown that a network-based approach can enhance our understanding of the complicated host-pathogen interactions between maize and F. verticillioides by interpreting the transcriptome data in a system-oriented manner. We expect that the proposed analytic pipeline can also be adapted for investigating potential functional modules associated with host defense response in diverse plant-pathogen interactions.
Collapse
|
38
|
Ortiz CS, Richards C, Terry A, Parra J, Shim WB. Genetic Variability and Geographical Distribution of Mycotoxigenic Fusarium verticillioides Strains Isolated from Maize Fields in Texas. Plant Pathol J 2015; 31:203-11. [PMID: 26361468 PMCID: PMC4564145 DOI: 10.5423/ppj.oa.02.2015.0020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 04/22/2015] [Accepted: 04/29/2015] [Indexed: 06/01/2023]
Abstract
Maize is the dominant cereal crop produced in the US. One of the main fungal pathogens of maize is Fusarium verticillioides, the causative agent of ear and stalk rots. Significantly, the fungus produces a group of mycotoxins - fumonisins - on infested kernels, which have been linked to various illnesses in humans and animals. Nonetheless, durable resistance against F. verticillioides in maize is not currently available. In Texas, over 2.1 million acres of maize are vulnerable to fumonisin contamination, but understanding of the distribution of toxigenic F. verticillioides in maize-producing areas is currently lacking. Our goal was to investigate the genetic variability of F. verticillioides in Texas with an emphasis on fumonisin trait and geographical distribution. A total of 164 F. verticillioides cultures were isolated from 65 maize-producing counties. DNA from each isolate was extracted and analyzed by PCR for the presence of FUM1- a key fumonisin biosynthesis gene - and mating type genes. Results showed that all isolates are in fact F. verticillioides capable of producing fumonisins with a 1:1 mating-type gene ratio in the population. To further study the genetic diversity of the population, isolates were analyzed using RAPD fingerprinting. Polymorphic markers were identified and the analysis showed no clear correlation between the RAPD profile of the isolates and their corresponding geographical origin. Our data suggest the toxigenic F. verticillioides population in Texas is widely distributed wherever maize is grown. We also hypothesize that the population is fluid, with active movement and genetic recombination occurring in the field.
Collapse
Affiliation(s)
- Carlos S. Ortiz
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843-2132,
USA
| | - Casey Richards
- Bioenvironmental Sciences Program, Texas A&M University, College Station, TX 77843-2132,
USA
| | - Ashlee Terry
- Bioenvironmental Sciences Program, Texas A&M University, College Station, TX 77843-2132,
USA
| | - Joselyn Parra
- Bioenvironmental Sciences Program, Texas A&M University, College Station, TX 77843-2132,
USA
| | - Won-Bo Shim
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX 77843-2132,
USA
- Bioenvironmental Sciences Program, Texas A&M University, College Station, TX 77843-2132,
USA
| |
Collapse
|
39
|
Kim JJ, Kwon YK, Kim JH, Heo SJ, Lee Y, Lee SJ, Shim WB, Jung WK, Hyun JH, Kwon KK, Kang DH, Oh C. Effective microwell plate-based screening method for microbes producing cellulase and xylanase and its application. J Microbiol Biotechnol 2015; 24:1559-65. [PMID: 25085570 DOI: 10.4014/jmb.1405.05052] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Cellulase and xylanase are main hydrolysis enzymes for the degradation of cellulosic and hemicellulosic biomass, respectively. In this study, our aim was to develop and test the efficacy of a rapid, high-throughput method to screen hydrolytic-enzyme-producing microbes. To accomplish this, we modified the 3,5-dinitrosalicylic acid (DNS) method for microwell plate-based screening. Targeted microbial samples were initially cultured on agar plates with both cellulose and xylan as substrates. Then, isolated colonies were subcultured in broth media containing yeast extract and either cellulose or xylan. The supernatants of the culture broth were tested with our modified DNS screening method in a 96-microwell plate, with a 200 μl total reaction volume. In addition, the stability and reliability of glucose and xylose standards, which were used to determine the enzymatic activity, were studied at 100°C for different time intervals in a dry oven. It was concluded that the minimum incubation time required for stable color development of the standard solution is 20 min. With this technique, we successfully screened 21 and 31 cellulase- and xylanase-producing strains, respectively, in a single experimental trial. Among the identified strains, 19 showed both cellulose and xylan hydrolyzing activities. These microbes can be applied to bioethanol production from cellulosic and hemicellulosic biomass.
Collapse
Affiliation(s)
- Jennifer Jooyoun Kim
- School of Marine and Atmospheric Science, Stony Brook University, Stony Brook, NY 11794-5000, USA
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Seok Y, Byun JY, Shim WB, Kim MG. A structure-switchable aptasensor for aflatoxin B1 detection based on assembly of an aptamer/split DNAzyme. Anal Chim Acta 2015; 886:182-7. [PMID: 26320651 DOI: 10.1016/j.aca.2015.05.041] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 05/20/2015] [Accepted: 05/26/2015] [Indexed: 12/16/2022]
Abstract
An ultrasensitive, colorimetric and homogeneous strategy for aflatoxin B1 (AFB1) detection, which uses a DNA aptamer and two split DNAzyme halves, has been developed. Split halves of a hemin-binding DNAzymes is combined with an AFB1 aptamer to generate a homogeneous colorimetric sensor that undergoes an AFB1 induced DNA structural change. In the absence of AFB1, the split probes have peroxidase mimicking DNAzyme activity associated with catalysis of a color change reaction. Specific recognition of AFB1 by the aptamer component leads to structural deformation of the aptamer-DNAzyme complex, which causes splitting of the DNAzyme halves and a reduction in peroxidase mimicking activity. Therefore, a decrease of colorimetric signal arising from the catalytic process takes place upon in the presence of AFB1 in a concentration dependent manner in the 0.1-1.0 × 10(4) ng/mL range and with a colorimetric detection limit of 0.1 ng/mL. The new assay system exhibits high selectivity for AFB1 over other mycotoxins and can be employed detect the presence of AFB1 in ground corn samples. Overall, the strategy should serve as the basis for the development of rapid, simple and low-cost methods for detection of mycotoxins.
Collapse
Affiliation(s)
- Youngung Seok
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Gwangju 500-712, Republic of Korea
| | - Ju-Young Byun
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Gwangju 500-712, Republic of Korea
| | - Won-Bo Shim
- Food Analysis Research Team, Industry Service Research Center, World Institute of Kimchi an Annex of Korea Food Research Institute, 86, Kimchi-ro, Nam-gu, Gwangju, Republic of Korea
| | - Min-Gon Kim
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Gwangju 500-712, Republic of Korea; Advanced Photonics Research Institute, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Gwangju 500-712, Republic of Korea.
| |
Collapse
|
41
|
Jeon SM, Kim JH, Kim T, Park A, Ko AR, Ju SJ, Heo SJ, Oh C, Affan MA, Shim WB, Kang DH. Morphological, Molecular, and Biochemical Characterization of Monounsaturated Fatty Acids-Rich Chlamydomonas sp. KIOST-1 Isolated from Korea. J Microbiol Biotechnol 2015; 25:723-31. [DOI: 10.4014/jmb.1412.12056] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
|
42
|
Park JH, Byun JY, Shim WB, Kim SU, Kim MG. High-sensitivity detection of ATP using a localized surface plasmon resonance (LSPR) sensor and split aptamers. Biosens Bioelectron 2015; 73:26-31. [PMID: 26042875 DOI: 10.1016/j.bios.2015.05.043] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 05/08/2015] [Accepted: 05/19/2015] [Indexed: 01/24/2023]
Abstract
A highly sensitive localized surface plasmon resonance (LSPR) aptasensor for detection of adenosine triphosphate (ATP) has been developed. The sensor utilizes two split ATP aptamers, one (receptor fragment) being covalently attached to the surface of a gold nanorod (GNR) and the other labeled with a random DNA sequence and TAMRA dye (probe fragment). In the presence of both ATP and the probe fragment, a significant shift takes place in the wavelength of the LSPR band. This phenomenon is a consequence of the fact that the split fragments assemble into an intact folded structure in the presence of ATP, which brings about a decrease in the distance between the GNR surface and TAMRA dye and an associated LSPR wavelength. By using this sensor system, concentrations of ATP in the range of 10 pM-10 μM can be determined. In addition, by taking advantage of its denaturation properties, the LSPR aptasensor can be reused by simply subjecting it to quadruple salt-addition/2M NaCl washing steps. That the new method is applicable to biological systems was demonstrated by its use to measure ATP concentrations in E. coli and, thus to determine cell concentrations as low as 1.0×10(3) CFU.
Collapse
Affiliation(s)
- Jin-Ho Park
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712,Republic of Korea
| | - Ju-Young Byun
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712,Republic of Korea
| | - Won-Bo Shim
- Food Analysis Research Team, Industry Service Research Center, World Institute of Kimchi an Annex of Korea Food Research Institute, 86 Kimchi-ro, Nam-gu, Gwangju, Republic of Korea
| | - Seong U Kim
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea
| | - Min-Gon Kim
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712,Republic of Korea; Advanced Photonics Research Institute, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea.
| |
Collapse
|
43
|
Zhang C, Chen Y, Yin Y, Ji HH, Shim WB, Hou Y, Zhou M, Li XD, Ma Z. A small molecule species specifically inhibits Fusarium myosin I. Environ Microbiol 2015; 17:2735-46. [PMID: 25404531 DOI: 10.1111/1462-2920.12711] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 11/03/2014] [Accepted: 11/05/2014] [Indexed: 11/28/2022]
Abstract
Fusarium head blight (FHB) caused by Fusarium graminearum is a devastating disease of cereal crops worldwide. Recently, a novel fungicide JS399-19 has been launched into the marketplace to manage FHB. It is compelling that JS399-19 shows highly inhibitory activity towards some Fusarium species, but not to other fungi, indicating that it is an environmentally compatible fungicide. To explore the mode of action of this species-specific compound, we conducted a whole-genome transcript profiling together with genetic and biochemical assays, and discovered that JS399-19 targets the myosin I of F. graminearum (FgMyo1). FgMyo1 is essential for F. graminearum growth. A point mutation S217L or E420K in FgMyo1 is responsible for F. graminearum resistance to JS399-19. In addition, transformation of F. graminearum with the myosin I gene of Magnaporthe grisea, the causal agent of rice blast, also led to JS399-19 resistance. JS399-19 strongly inhibits the ATPase activity of the wild-type FgMyo1, but not the mutated FgMyo1(S217L/E420K) . These results provide us a new insight into the design of species-specific antifungal compounds. Furthermore, our strategy can be applied to identify novel drug targets in various pathogenic organisms.
Collapse
Affiliation(s)
- Chengqi Zhang
- Institute of Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Yun Chen
- Institute of Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Yanni Yin
- Institute of Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Huan-Hong Ji
- National Laboratory of Integrated Management of Insect Pests and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Won-Bo Shim
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, TX, 77843-2132, USA
| | - Yiping Hou
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Mingguo Zhou
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xiang-Dong Li
- National Laboratory of Integrated Management of Insect Pests and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Zhonghua Ma
- Institute of Biotechnology, Zhejiang University, Hangzhou, 310058, China
| |
Collapse
|
44
|
Kim KY, Shim WB, Kim JS, Chung DH. Development of a Simultaneous Lateral Flow Strip Test for the Rapid and Simple Detection of Deoxynivalenol and Zearalenone. J Food Sci 2014; 79:M2048-55. [DOI: 10.1111/1750-3841.12647] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 08/08/2014] [Indexed: 01/15/2023]
Affiliation(s)
- Kyeong-Yeol Kim
- Div. of Applied Life Science; Graduate School; Gyeongsang National Univ; Jinju Gyeongnam 660-701 Republic of Korea
| | - Won-Bo Shim
- School of Physics and Chemistry; Gwangju Inst. of Science and Technology; Gwangju; 500-712 Republic of Korea
| | - Jeong-Sook Kim
- Inst. of Agriculture and Life Science; Gyeongsang Natl. Univ; Jinju Gyeongnam 660-701 Republic of Korea
| | - Duck-Hwa Chung
- Div. of Applied Life Science; Graduate School; Gyeongsang National Univ; Jinju Gyeongnam 660-701 Republic of Korea
- Inst. of Agriculture and Life Science; Gyeongsang Natl. Univ; Jinju Gyeongnam 660-701 Republic of Korea
| |
Collapse
|
45
|
Kim SR, Yoon Y, Seo MK, Kim WI, Shim WB, Chung DH, Yun JC, Ryu KY, Kim BS. Modification of methods for detection of Escherichia coli O157:H7 on produce. Food Sci Biotechnol 2014. [DOI: 10.1007/s10068-014-0185-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
46
|
Yu F, Gu Q, Yun Y, Yin Y, Xu JR, Shim WB, Ma Z. The TOR signaling pathway regulates vegetative development and virulence in Fusarium graminearum. New Phytol 2014; 203:219-32. [PMID: 24684168 DOI: 10.1111/nph.12776] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2013] [Accepted: 02/14/2014] [Indexed: 05/28/2023]
Abstract
The target of rapamycin (TOR) signaling pathway plays critical roles in controlling cell growth in a variety of eukaryotes. However, the contribution of this pathway in regulating virulence of plant pathogenic fungi is unknown. We identified and characterized nine genes encoding components of the TOR pathway in Fusarium graminearum. Biological, genetic and biochemical functions of each component were investigated. The FgFkbp12-rapamycin complex binds to the FgTor kinase. The type 2A phosphatases FgPp2A, FgSit4 and FgPpg1 were found to interact with FgTap42, a downstream component of FgTor. Among these, we determined that FgPp2A is likely to be essential for F. graminearum survival, and FgSit4 and FgPpg1 play important roles in cell wall integrity by positively regulating the phosphorylation of FgMgv1, a key MAP kinase in the cell wall integrity pathway. In addition, the FgPpg1 interacting protein, FgTip41, is involved in regulating mycelial growth and virulence. Notably, FgTip41 does not interact with FgTap42 but with FgPpg1, suggesting the existence of FgTap42:FgPpg1:FgTip41 heterotrimer in F. graminearum, a complex not observed in the yeast model. Collectively, we defined a genetic regulatory framework that elucidates how the TOR pathway regulates virulence and vegetative development in F. graminearum.
Collapse
Affiliation(s)
- Fangwei Yu
- Institute of Biotechnology, Zhejiang University, Hangzhou 310058, China
| | | | | | | | | | | | | |
Collapse
|
47
|
Gu Q, Zhang C, Yu F, Yin Y, Shim WB, Ma Z. Protein kinase FgSch9 serves as a mediator of the target of rapamycin and high osmolarity glycerol pathways and regulates multiple stress responses and secondary metabolism in F
usarium graminearum. Environ Microbiol 2014; 17:2661-76. [DOI: 10.1111/1462-2920.12522] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Revised: 05/27/2014] [Accepted: 05/29/2014] [Indexed: 01/17/2023]
Affiliation(s)
- Qin Gu
- Institute of Biotechnology; Zhejiang University; 866 Yuhangtang Road Hangzhou 310058 China
| | - Chengqi Zhang
- Institute of Biotechnology; Zhejiang University; 866 Yuhangtang Road Hangzhou 310058 China
| | - Fangwei Yu
- Institute of Biotechnology; Zhejiang University; 866 Yuhangtang Road Hangzhou 310058 China
| | - Yanni Yin
- Institute of Biotechnology; Zhejiang University; 866 Yuhangtang Road Hangzhou 310058 China
| | - Won-Bo Shim
- Department of Plant Pathology and Microbiology; Texas A&M University; College Station TX USA
| | - Zhonghua Ma
- Institute of Biotechnology; Zhejiang University; 866 Yuhangtang Road Hangzhou 310058 China
| |
Collapse
|
48
|
Park JH, Byun JY, Mun H, Shim WB, Shin YB, Li T, Kim MG. A regeneratable, label-free, localized surface plasmon resonance (LSPR) aptasensor for the detection of ochratoxin A. Biosens Bioelectron 2014; 59:321-7. [PMID: 24747570 DOI: 10.1016/j.bios.2014.03.059] [Citation(s) in RCA: 98] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 03/26/2014] [Accepted: 03/27/2014] [Indexed: 10/25/2022]
Abstract
Binding of an analyte on the surface of a nanoparticle typically promotes a change in the local refractive index, which gives rise to a shift in the wavelength of the localized surface plasmon resonance (LSPR) absorption band. The magnitude of the LSPR wavelength change is dependent on both the location of the analyte relative to the surface of the nanoparticle and the degree of alteration of the refractive index. We have employed this phenomenon as the basis for designing a new, label-free approach for the detection of the toxic mold mycotoxin, ochratoxin A (OTA) that employs a gold nanorod (GNR) and an aptamer target binding mechanism. In this system, binding of OTA causes an accumulation of OTA and G-quadruplex structure of the aptamer. This process results in a longitudinal wavelength shift of the LSPR peak associated with a change in the local refractive index near the GNR surface. By using this method, OTA can be quantitatively detected at concentrations lower than 1 nM. In addition, the results of this effort show that aptamer functionalized GNR substrate is robust in that it can be regenerated for reuse over seven times by heating in methanol at 70 °C to remove OTA. Moreover, the proposed biosensor system exhibits high selectivity for OTA over other mycotoxins. Finally, the sensor can be employed to detect OTA in ground corn samples with excellent recovery levels.
Collapse
Affiliation(s)
- Jin-Ho Park
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Gwangju 500-712, Republic of Korea
| | - Ju-Young Byun
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Gwangju 500-712, Republic of Korea
| | - Hyoyoung Mun
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Gwangju 500-712, Republic of Korea
| | - Won-Bo Shim
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Gwangju 500-712, Republic of Korea
| | - Yong-Beom Shin
- Immune Therapy Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon 305-806, Republic of Korea
| | - Taihua Li
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Gwangju 500-712, Republic of Korea
| | - Min-Gon Kim
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Gwangju 500-712, Republic of Korea; Advanced Photonics Research Institute, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Gwangju 500-712, Republic of Korea.
| |
Collapse
|
49
|
Mun H, Jo EJ, Li T, Joung HA, Hong DG, Shim WB, Jung C, Kim MG. Homogeneous assay of target molecules based on chemiluminescence resonance energy transfer (CRET) using DNAzyme-linked aptamers. Biosens Bioelectron 2014; 58:308-13. [PMID: 24658027 DOI: 10.1016/j.bios.2014.02.008] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Revised: 01/27/2014] [Accepted: 02/05/2014] [Indexed: 12/28/2022]
Abstract
We have designed a single-stranded DNAzyme-aptamer sensor for homogeneous target molecular detection based on chemiluminescence resonance energy transfer (CRET). The structure of the engineered single-stranded DNA (ssDNA) includes the horseradish peroxidase (HRP)-like DNAzyme, optimum-length linker (10-mer-length DNA), and target-specific aptamer sequences. A quencher dye was modified at the 3' end of the aptamer sequence. The incorporation of hemin into the G-quadruplex structure of DNAzyme yields an active HRP-like activity that catalyzes luminol to generate a chemiluminescence (CL) signal. In the presence of target molecules, such as ochratoxin A (OTA), adenosine triphosphate (ATP), or thrombin, the aptamer sequence was folded due to the formation of the aptamer/analyte complex, which induced the quencher dye close to the DNAzyme structure. Consequently, the CRET occurred between a DNAzyme-catalyzed chemiluminescence reaction and the quencher dye. Our results showed that CRET-based DNAzyme-aptamer biosensing enabled specific OTA analysis with a limit of detection of 0.27ng/mL. The CRET platform needs no external light source and avoids autofluorescence and photobleaching, and target molecules can be detected specifically and sensitively in a homogeneous manner.
Collapse
Affiliation(s)
- Hyoyoung Mun
- School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea
| | - Eun-Jung Jo
- School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea
| | - Taihua Li
- School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea
| | - Hyou-Arm Joung
- School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea
| | - Dong-Gu Hong
- School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea
| | - Won-Bo Shim
- School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea
| | - Cheulhee Jung
- Department of Chemistry and Biochemistry, Institute of Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712, USA
| | - Min-Gon Kim
- School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea; Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea.
| |
Collapse
|
50
|
Li T, Kim BB, Shim WB, Byun JY, Chung DH, Shin YB, Kim MG. Homogeneous Fluorescence Resonance Energy Transfer Immunoassay for the Determination of Zearalenone. ANAL LETT 2014. [DOI: 10.1080/00032719.2013.843186] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|