In addition to the above data, SKEMPI 2.0 also provides data on the location of the mutated residues, the homology between interactions in the dataset, and processed PDB files, which can be easily parsed.
Residue location: Each mutated residue is classified according to the scheme proposed by Levy (2010) (link); residues at the interface are classified as support (mostly buried when unbound and entirely buried upon binding), core (mostly solvent exposed when unbound but buried upon binding) and rim (partly buried upon binding), while residues away from the binding site are classified as interior or surface. Solvent exposed surface area was calculated using CCP4 (Winn et al., 2011 (link)).
Processed PDB files: The PDB files for the interactions, as downloaded from the Protein Data Bank (Berman et al., 2000 (link)), often contain multiple copies of the interacting proteins in the unit cell or other chains irrelevant to the interaction. In one instance, the binding of dimeric myostatin to follistatin-like 3, the myostatin dimer must be created by tessellating the unit cell. Further, some PDB files contain features that are not readily parsed by some software, such as residue insertion codes or negative residue numbers. To help users we provide “cleaned” PDB files which contain only the chains of interest, renumbered from one, as well as waters and other molecules with a non-hydrogen atom within 5 Å of a non-hydrogen atom of any of the chains of interest. Consequently, each mutation is reported with both PDB numbering and renumbered.
Defining homologous interactions: Each entry also specifies which other entries are mutations to homologous interactions. Two interactions are deemed homologous if they have a shared binding partner or homologous binding partner and at least 70% of the corresponding interface residues are common to both interactions. We determine the homology between proteins using the GAP4 program (Huang and Brutlag, 2007 (link)), and define homologous proteins as those with a similarity score greater than 50 and at least 30% sequence identity. Interface residues are defined as those with a non-hydrogen atom within 10 Å of a non-hydrogen atom on the binding partner. Interactions falling within manually assigned clusters of homologous interactions are designated as pMHC/TCR, antibody/antigen or protease/inhibitor. While the names of these clusters have been chosen to reflect the predominant function of their constituent interactions, they reflect the homologies within the dataset and are not functional assignments. Thus, for instance, some nanobodies are classified as antibodies as they bind to the same site as cetuximab, 14.3.d is classified as TCR, even though it is only the β chain, and its binding partner, enterotoxin C3, is classified as a pMHC.
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Enterotoxins
Enterotoxins
Enterotoxins are potent toxins produced by certain bacteria that can cause severe gastrointestinal illness in humans and animals.
These toxins disrupt the normal function of the intestinal epithelium, leading to symptoms like diarrhea, vomiting, and abdominal pain.
Studying enterotoxins is crucial for understanding the mechanisms of foodborne illnesses and developing effective prevention and treatment strategies.
PubCompare.ai's AI-driven platform helps researchers optimize their research protocols for reproducibility and accuracy when investigating these important toxins.
The tool enables you to quickly locate and compare protocols from the literature, preprints, and patents, allowing you to identify the best approaches for your research and streamline your work to achieve more reliable results.
These toxins disrupt the normal function of the intestinal epithelium, leading to symptoms like diarrhea, vomiting, and abdominal pain.
Studying enterotoxins is crucial for understanding the mechanisms of foodborne illnesses and developing effective prevention and treatment strategies.
PubCompare.ai's AI-driven platform helps researchers optimize their research protocols for reproducibility and accuracy when investigating these important toxins.
The tool enables you to quickly locate and compare protocols from the literature, preprints, and patents, allowing you to identify the best approaches for your research and streamline your work to achieve more reliable results.
Most cited protocols related to «Enterotoxins»
Antibodies
Antigens
Binding Sites
Cells
Cetuximab
Enterotoxins
Follistatin
GDF8 protein, human
Hydrogen
Hydrogen-5
Immunoglobulins
Mutation
Protease Inhibitors
Proteins
Solvents
Staphylococcal Protein A
VHH Immunoglobulin Fragments
A single, fresh, whole stool specimen was collected from cases and controls at enrollment for the recovery of potential enteropathogens. Various specific growth media were used for detecting the bacterial pathogens. Up to 3 colonies with the appearance of E. coli on MacConkey agar were selected from each sample and tested using multiplex polymerase chain reaction (PCR) for enterotoxigenic E coli (ETEC) (heat-labile [LT] and heat-stable [ST] enterotoxins), enteropathogenic E. coli (EPEC) (eae and bfpA), and EAEC (aaiC and aatA). Any colonies that were positive for either aaiC (chromosomally encoded) or aatA (encoded on the pAA plasmid) were considered EAEC for the purposes of this analysis.
Agar
Bacteria
Culture Media
Enteropathogenic Escherichia coli
Enterotoxigenic Escherichia coli
Enterotoxins
Escherichia coli
Feces
Multiplex Polymerase Chain Reaction
Pathogenicity
Plasmids
The Infectious Diseases and Beliaghata General Hospital (ID&BGH), in Kolkata, a 770 bedded hospital, provides treatment for about 20,000 to 25,000 hospitalized patients with acute diarrhoea annually. In the present systematic active surveillance, every fifth patient with diarrhoea or dysentery without other associated illness on two randomly selected days of the week was enrolled as study subjects from cases admitted at the ID&BGH. This study was conducted between November 2007 and October 2009. The dehydration status of each diarrhoea case was classified as no, some or severe dehydration according to WHO guidelines. The clinical, demographic and laboratory data was checked manually and entered into pre-designed data entry proforma developed in visual basic with inbuilt entry validation checking facilitated programme in structure query language (SQL) server by dual entry method by trained data entry professionals. Data was randomly checked and matched to derive consistency and validity for analysis. The edited data was exported and a final analysis was performed using the SPSS.17.0 software (SPSS Inc., Chicago, IL, USA).
This study was approved by the duly constituted Institutional Ethics Committee (IEC). As per the recommendation of IEC, individual informed consent was obtained from each patient enrolled in this study and confidentiality was maintained. Faecal specimens were collected in McCartney bottles using sterile catheters or as rectal swabs in Cary Blair medium and were examined within 2 hrs for 24 enteric pathogens comprising bacterial, viral and parasitic pathogens using a combination of conventional, immunological and molecular methods (Fig.6 ). PCR targeting ompW and toxR were performed for the species confirmation of V. cholerae and V. fluvialis, respectively [31 (link),32 (link)]. Confirmed strains of V. parahaemolyticus, Shigella spp and Salmonella spp were serotyped using commercially available antisera (Denka Seiken, Tokyo, Japan, BioRad, Marnes-la-Coquette, France). V. cholerae strains were serotyped using antisera prepared in NICED. Representative strains of V. cholerae O1 were examined by MAMA-PCR to determine the type of cholera toxin B subunit gene (ctxB) [33 (link)]. Three different lactose-fermenting colonies isolated from each sample were picked from MacConkey agar plate and included in the multiplex PCR assay for the detection of different DEC that include enterotoxigenic E. coli (ETEC, inclusive of both heat-labile and heat-stable enterotoxin producers), enteropathogenic E. coli (typical and atypical EPEC) and enteroaggregative E. coli (EAEC) [34 (link)]. Simplex PCR was also performed for the detection of enteroinvasive E. coli (EIEC) and Shiga toxin-producing E. coli (STEC) [35 (link),36 (link)].
Antimicrobial susceptibility testing was performed by disk diffusion (Kirby- Bauer method) using commercially available disks (Becton Dickinson Co., Sparks, MD, USA) with interpretation stipulated by the Clinical and Laboratory Standard Institute [37 ]. Two hundred and thirty representative (one third from the total number of strains) V. cholerae O1 strains covering all the months and all the Shigella strains were included in the testing. Rotavirus was detected by polyacrylamide gel electrophoresis and silver staining [38 (link)]. Norovirus [Group I and II (NVGI and NVGII)], Sapovirus and Astrovirus were detected by RT-PCR using random primers for reverse transcription and specific primers for polymerase chain reaction [24 (link),39 (link)]. Different viruses were detected according to the appropriate amplicon sizes observed in agarose gels stained with ethidium bromide. Adenovirus was detected by the commercially available RotaAdeno VIKIA kit (biomereux, France), which is a qualitative test-based on immunochromatography in lateral flow format [40 (link)]. For detection of enteric parasites, faecal samples were processed separately for microscopic and molecular analysis. For microscopic analysis, the samples were first concentrated using formalin ethyl acetate concentration method [41 ] and an aliquot of each sample was preserved in 10% formalin and stored at 4°C for subsequent use. Aliquots of fresh stool specimens were also preserved at -80°C for ELISA and PCR assays. All the faecal samples were screened using a highly sensitive antigen capture ELISA (Tech Lab, Blacksburg, USA) and PCR for the detection of Giardia lamblia, Cryptosporidium parvum and Entamoeba histolytica. Faecal samples were processed by microscopy using iodine wet mount staining and trichome staining procedure for Blastocystis hominis [42 ].
Using the surveillance data, an estimate of the total number of cases specific for each pathogen in two consecutive years was extrapolated. From the monthly enrolled cases, the isolation rate of different pathogens was calculated for that particular month. An estimate of total number of cases with particular pathogen for a particular month was then extrapolated by multiplying the total admitted cases with particular isolation rate of the pathogenic with an assumption that similar isolation rate would be among non-enrolled cases. In this way, pathogen-specific total number of yearly estimated cases was calculated.
The risk age group was also explored for predominant enteric pathogens such as V. cholerae O1, Rotavirus, shigellae and G. lamblia by Multinomial Logistic Regression (MLR) analysis [43 (link),44 (link)]. This analysis helps to determine the likelihood age of the patient associated with any enteric pathogen. The age groups were classified into 8 categories viz. <1 year, 1-2 years, >2-5 years, >5-14 years, >14-30 years, >30-45 years, >45-60 years and >60 years and were coded from 1 to 8, respectively. Infection caused by an enteric pathogen was coded as '1' for the pathogen present and '2' for its absence. The extreme values of the classified age group was fixed as a reference category.
This study was approved by the duly constituted Institutional Ethics Committee (IEC). As per the recommendation of IEC, individual informed consent was obtained from each patient enrolled in this study and confidentiality was maintained. Faecal specimens were collected in McCartney bottles using sterile catheters or as rectal swabs in Cary Blair medium and were examined within 2 hrs for 24 enteric pathogens comprising bacterial, viral and parasitic pathogens using a combination of conventional, immunological and molecular methods (Fig.
Antimicrobial susceptibility testing was performed by disk diffusion (Kirby- Bauer method) using commercially available disks (Becton Dickinson Co., Sparks, MD, USA) with interpretation stipulated by the Clinical and Laboratory Standard Institute [37 ]. Two hundred and thirty representative (one third from the total number of strains) V. cholerae O1 strains covering all the months and all the Shigella strains were included in the testing. Rotavirus was detected by polyacrylamide gel electrophoresis and silver staining [38 (link)]. Norovirus [Group I and II (NVGI and NVGII)], Sapovirus and Astrovirus were detected by RT-PCR using random primers for reverse transcription and specific primers for polymerase chain reaction [24 (link),39 (link)]. Different viruses were detected according to the appropriate amplicon sizes observed in agarose gels stained with ethidium bromide. Adenovirus was detected by the commercially available RotaAdeno VIKIA kit (biomereux, France), which is a qualitative test-based on immunochromatography in lateral flow format [40 (link)]. For detection of enteric parasites, faecal samples were processed separately for microscopic and molecular analysis. For microscopic analysis, the samples were first concentrated using formalin ethyl acetate concentration method [41 ] and an aliquot of each sample was preserved in 10% formalin and stored at 4°C for subsequent use. Aliquots of fresh stool specimens were also preserved at -80°C for ELISA and PCR assays. All the faecal samples were screened using a highly sensitive antigen capture ELISA (Tech Lab, Blacksburg, USA) and PCR for the detection of Giardia lamblia, Cryptosporidium parvum and Entamoeba histolytica. Faecal samples were processed by microscopy using iodine wet mount staining and trichome staining procedure for Blastocystis hominis [42 ].
Using the surveillance data, an estimate of the total number of cases specific for each pathogen in two consecutive years was extrapolated. From the monthly enrolled cases, the isolation rate of different pathogens was calculated for that particular month. An estimate of total number of cases with particular pathogen for a particular month was then extrapolated by multiplying the total admitted cases with particular isolation rate of the pathogenic with an assumption that similar isolation rate would be among non-enrolled cases. In this way, pathogen-specific total number of yearly estimated cases was calculated.
The risk age group was also explored for predominant enteric pathogens such as V. cholerae O1, Rotavirus, shigellae and G. lamblia by Multinomial Logistic Regression (MLR) analysis [43 (link),44 (link)]. This analysis helps to determine the likelihood age of the patient associated with any enteric pathogen. The age groups were classified into 8 categories viz. <1 year, 1-2 years, >2-5 years, >5-14 years, >14-30 years, >30-45 years, >45-60 years and >60 years and were coded from 1 to 8, respectively. Infection caused by an enteric pathogen was coded as '1' for the pathogen present and '2' for its absence. The extreme values of the classified age group was fixed as a reference category.
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Adenoviruses
Agar
Age Groups
Antigens
Astroviridae
Bacteriophages
Biological Assay
Blastocystis hominis
Catheters
Choleragenoid
Communicable Diseases
Cryptosporidium parvum
Dehydration
Diarrhea
Diffusion
Dysentery
Entamoeba histolytica
Enteroaggregative Escherichia coli
Enteroinvasive Escherichia coli
Enteropathogenic Escherichia coli
Enterotoxigenic Escherichia coli
Enterotoxins
Enzyme-Linked Immunosorbent Assay
Escherichia coli
Ethidium Bromide
ethyl acetate
Feces
Formalin
Gels
Genes
Giardia
Giardia lamblia
Immune Sera
Immunochromatography
Infection
Institutional Ethics Committees
Iodine
isolation
Lactose
Microbicides
Microscopy
Multiplex Polymerase Chain Reaction
Norovirus
Oligonucleotide Primers
Parasites
Pathogenicity
Patients
Polyacrylamide Gel Electrophoresis
Population at Risk
Rectum
Reverse Transcriptase Polymerase Chain Reaction
Reverse Transcription
Rotavirus
Salmonella
Sapovirus
Sepharose
Shiga-Toxigenic Escherichia coli
Shiga Toxin
Shigella
Sterility, Reproductive
Strains
Susceptibility, Disease
Trichomes
Vibrio cholerae
Virus
DNA was extracted using a QIAmp DNA stool mini kit (QIAGEN, Hilden, Germany), following the manufacturer’s protocol. Extracts were thereafter stored at −20 °C. A part of the stool samples was preserved in 5% formalin to perform the microscopic analysis. PCR investigations were carried out on site. In addition, extracts and formalin samples were sent to the Bernhard–Nocht Institute for Tropical Medicine (BNITM, Hamburg, HH, Germany). During the BNITM microscopy, control examinations and further analysis were performed. Airfreight requirements were fulfilled, the cooling chain was not interrupted (based on the temperature control documentation), and transport was done by a specialized company (World Courier, Frankfurt, HE, Germany).
In-house real-time multiplex PCRs for protozoan and helminthic parasites targeting Entamoeba histolytica, Giardia intestinalis, Cryptosporidium spp., and Cyclospora cayetanensis, as well as Necator americanus, Strongyloides stercoralis, Ascaris lumbricoides, Ancylostoma spp., Trichuris trichiura, Schistosoma spp., Enterobius vermicularis, Taenia saginata, Taenia solium, and Hymenolepis nana were performed as described before [3 (link)]. Further, enteroinvasive bacterial pathogens like Campylobacter jejuni, Salmonella spp., Shigella ssp./enteroinvasive E. coli (EIEC), and Yersinia spp. were assessed by in-house real-time PCR [4 (link)]. To identify diarrheagenic E. coli infections, Rida Gene RT-PCR assays for enterohemorrhagic Escherichia coli (EHEC), enteropathogenic E. coli (EPEC), enteroinvasive E. coli (EIEC), enterotoxin-producing E. coli (ETEC), enteroinvasive E. coli (EIEC), and enteroaggregative E. coli (EAEC) (R-Biopharm AG, Darmstadt, HE, Germany) were used, as described before [5 (link)]. Furthermore, a species-specific PCR for Tropheryma whipplei [6 (link)] was applied [7 (link)]. The DNA of phocid herpesvirus was included as an internal control for the in-house PCRs [8 (link),9 (link)].
In all RT-PCRs runs, positive and negative controls were included: As positive controls, synthetically designed target sequences linked by EcoR1 endonuclease restriction sites and inserted into pEX-A128 vector backbones were used (Eurofins Scientific SE). Negative controls included PCT water samples that had undergone the whole nucleic acid extraction process to exclude sample contamination. All primers and probes of the in-house PCRs were purchased from Eurofins, Hamburg, HH, Germany. The assays were performed on a multi-channel RotorGene Q Cycler (Qiagen, Hilden, HE, Germany).
In addition, light microscopy of all stool samples by direct saline and/or iodine mounts and following a formol-ethyl acetate concentration was performed.
In-house real-time multiplex PCRs for protozoan and helminthic parasites targeting Entamoeba histolytica, Giardia intestinalis, Cryptosporidium spp., and Cyclospora cayetanensis, as well as Necator americanus, Strongyloides stercoralis, Ascaris lumbricoides, Ancylostoma spp., Trichuris trichiura, Schistosoma spp., Enterobius vermicularis, Taenia saginata, Taenia solium, and Hymenolepis nana were performed as described before [3 (link)]. Further, enteroinvasive bacterial pathogens like Campylobacter jejuni, Salmonella spp., Shigella ssp./enteroinvasive E. coli (EIEC), and Yersinia spp. were assessed by in-house real-time PCR [4 (link)]. To identify diarrheagenic E. coli infections, Rida Gene RT-PCR assays for enterohemorrhagic Escherichia coli (EHEC), enteropathogenic E. coli (EPEC), enteroinvasive E. coli (EIEC), enterotoxin-producing E. coli (ETEC), enteroinvasive E. coli (EIEC), and enteroaggregative E. coli (EAEC) (R-Biopharm AG, Darmstadt, HE, Germany) were used, as described before [5 (link)]. Furthermore, a species-specific PCR for Tropheryma whipplei [6 (link)] was applied [7 (link)]. The DNA of phocid herpesvirus was included as an internal control for the in-house PCRs [8 (link),9 (link)].
In all RT-PCRs runs, positive and negative controls were included: As positive controls, synthetically designed target sequences linked by EcoR1 endonuclease restriction sites and inserted into pEX-A128 vector backbones were used (Eurofins Scientific SE). Negative controls included PCT water samples that had undergone the whole nucleic acid extraction process to exclude sample contamination. All primers and probes of the in-house PCRs were purchased from Eurofins, Hamburg, HH, Germany. The assays were performed on a multi-channel RotorGene Q Cycler (Qiagen, Hilden, HE, Germany).
In addition, light microscopy of all stool samples by direct saline and/or iodine mounts and following a formol-ethyl acetate concentration was performed.
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Ancylostoma
Ascaris lumbricoides
Bacteria
Biological Assay
Campylobacter jejuni
Cloning Vectors
Cryptosporidium
Cyclospora
DNA Restriction Enzymes
Entamoeba histolytica
Enteroaggregative Escherichia coli
Enterobius vermicularis
Enterohemorrhagic Escherichia coli
Enteroinvasive Escherichia coli
Enteropathogenic Escherichia coli
Enterotoxigenic Escherichia coli
Enterotoxins
Escherichia coli
Escherichia coli Infections
ethyl acetate
Feces
Formalin
Formol
Genes
Giardia lamblia
Helminths
Iodine
Light Microscopy
Microscopy
Necator americanus
Nucleic Acids
Oligonucleotide Primers
Parasites
Pathogenicity
Physical Examination
Polymerase Chain Reaction
Real-Time Polymerase Chain Reaction
Reverse Transcriptase Polymerase Chain Reaction
saginata, Taenia
Saline Solution
Salmonella
Schistosoma
Scrapie
Shigella
Simplexvirus
Strongyloides stercoralis
Taenia solium
Tapeworm, Dwarf
Trichuris trichiuras
Tropheryma whipplei
Vertebral Column
Yersinia
All B. cereus strains used in this study are listed in Table 1 and Supplemental Table S1 . Strains were grown at 30°C on CGY plates or in CGY broth. Unless stated otherwise, 30 ml cultures were inoculated from 17 h pre-cultures, and were grown in 300 ml Erlenmeyer flasks with 125 rpm at 30°C. For determination of enterotoxin production and toxicity, all strains listed in Table S1 were routinely grown for 6 h in CGY medium, inoculated with an optical density at 600 nm (OD600) of 0.2. For growth tests in this study, CGY medium was inoculated with a 17 h pre-culture to an OD600 of 0.05 and OD600 was recorded every 30 min. 5 milliliter (at 2 h) and 3 ml (at 6 h) samples were taken and centrifuged for 15 min at RT and 3500 rpm. Cell pellets were immediately frozen at −80°C and used for preparation of RNA and measurement of intracellular protein concentrations. Supernatants were filtered through 0.2 μm filters and separated for measurement of extracellular protein concentrations and enterotoxin production. For the latter, 1 mM EDTA was added to the culture supernatant. Supernatants were frozen and stored at −20°C. All growth tests and sample preparations were carried out in triplicates.
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Cells
Edetic Acid
Enterotoxins
Freezing
Pellets, Drug
Proteins
Protoplasm
Vision
Most recents protocols related to «Enterotoxins»
Stool samples or rectal swabs were obtained from each patient within 48 h of hospital admission. Toxigenic C. difficile carriers were identified with a real-time PCR assay, which simultaneously detects toxin A (TcdA enterotoxin, encoded by tcdA) and toxin B (TcdB cytotoxin, encoded by tcdB) (AdvanSure CD Real-Time PCR Kit; LG Life Science, Seoul, Korea). Enzyme-linked immunosorbent assay (ELISA) (C. DIFFICILE TOX A/B II, TECHLAB, USA) was used to evaluate the stool samples for toxin A and B production.
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Biological Assay
cellulose acetate-butyrate
Cytotoxin
Enterotoxins
Enzyme-Linked Immunosorbent Assay
Feces
Patients
Real-Time Polymerase Chain Reaction
Rectum
Toxins, Biological
trimethylaminocarboxyldihydroboran
DNA from B.subtilis isolates and B.cereus ATCC14579 as a positive control were extracted via the boiling method. In the next stage, PCR analyses were carried out to detect 6 enterotoxigenic genes. Table 6 show primer sequencers and PCR conditions58 (link).
Primer names and sequences, target size and PCR conditions for enterotoxin genes detection58 (link).
Primers | Target size (bp) | Sequences (5′–3′) | Reaction conditions |
---|---|---|---|
hblA F hblA R | 1154 | AAGCAATGGAATACAATGGG AGAATCTAAATCATGCCACTGC | 94 °C,2 min/(94 °C,60 s*56 °C,60 s*72 °C,120 s)35cycles /72 °C,5 min |
hblC F hblC R | 740 | GATACCAATGTGGCAACTGC TTGAGACTGCTCGCTAGTTG | 94 °C,2 min/(94 °C,60 s*58 °C,60 s*72 °C,120 s)35cycles /72 °C,5 min |
hblD F hblD R | 829 | ACCGGTAACACTATTCATGC GAGTCCATATGCTTAGATGC | 94 °C,2 min/(94 °C,60 s*58 °C,60 s*72 °C,120 s)35cycles /72 °C,5 min |
nheA F nheA R | 499 | TACGCTAAGGAGGGGCA GTTTTTATTGCTTCATCGGCT | 94 °C,2 min /(94 °C,60 s*56 °C,60 s*72 °C,120 s)35cycles /72 °C,5 min |
nheB F nheB R | 769 | CTATCAGCACTTATGGCAG ACTCCTAGCGGTGTTCC | 94 °C,2 min/(94 °C,60 s*54 °C,60 s*72 °C,120 s)35cycles /72 °C,5 min |
nheC F nheC R | 581 | CGGTAGTGATTGCTGGG CAGCATTCGTACTTGCCAA | 94 °C,2 min/(94 °C,60 s*58 °C,60 s*72 °C,120 s)35cycles /72 °C,5 min |
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Enterotoxins
Genes
Hereditary Diseases
Oligonucleotide Primers
For the detection of B. cereus toxin-encoding genes (Smase, sph; enterotoxin Bcet, bcet; enterotoxin FM, entFM; phosphatidylinositol-specific phospholipase; PI-PLC, plcA; cytotoxin K, cytK; NHEA, nheA; NHEB, nheB; and NHEC, nheC), PCR reactions were performed on bacterial genomic DNA. For each gene, primer pairs and amplification conditions were set as previously described [15 (link)].
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Cytotoxin
DNA, Bacterial
Enterotoxins
Genes
Genome
Oligonucleotide Primers
Phosphatidylinositols
Phospholipase
Toxins, Biological
A staphylococcal enterotoxins (SE) detection was performed in all cheese samples that presented Coagulase Positive Staphylococci levels ≥4.9 × 104 cfu/g. For the detection of SE, ISO 19020:2017 [12 ] was followed. Briefly, 25 g of cheese (10% of the shell and 90% of the inner part) suspended in 40 mL of distilled water at 38 °C ± 2 °C were homogenized in a stomacher, for 1 min and then shaken in an VXR basic Vibrax orbital shaker (Ika®, Staufen, Germany) at room temperature for 30 to 60 min to allow toxin diffusion. The pH of the slurry was adjusted between 3.5 and 4.0 with HCl and centrifuged at 3130× g for 15 min at 4 °C. The supernatant was collected and the pH adjusted to 7.5 ± 0.1 with NaOH and centrifuged again as described above. The supernatant was concentrated on a dialysis membrane with a molecular cut-off of 6000-8000 Da (Spectrum Laboratories, Rancho Dominguez, CA, USA) against 30% (w/v) of polyethylene glycol 20,000 (Merck, Darmstadt, Germany), overnight, at 4 °C. SE detection was performed using the alternative automated method VIDAS® Staph enterotoxin II (SET 2) (bioMérieux).
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Cheese
Coagulase
Dialysis
Diffusion
Enterotoxins
Polyethylene Glycols
Staphylococcal Enterotoxins
Staphylococcal Infections
Staphylococcus
Tissue, Membrane
Toxins, Biological
The presence of eight specific VAGs (papC, iucD, irp2, tsh, vat, astA, iss, and cva/cvi) was tested by a multiplex PCR [9 (link)]. The virulence-associated genes encode P-fimbria associated with adhesion [16 (link)], iron acquisition systems (iucD and irp2) [24 (link),25 (link)], and the temperature-sensitive autotransporter protein associated with high virulence [26 (link)]. The vat gene encodes a cytotoxic vacuolating autotransporter protein [27 (link)] the enteroaggregative heat-stable enterotoxin (astA) [28 (link)] a protein for increased serum survival (iss) [29 (link)] and the plasmid-borne genes cva/cvi which cause disruption of the membrane of sensitive cells [30 (link)]. E. coli isolated from MacConkey without any antimicrobials was used (Oxoid, CM0007). In brief, DNA was extracted by using a Maxwell® RSC Instrument and Cultured Cells DNA kits (AS1620, Maxwell, Nacka, Sweden), as recommended by the manufacturer. PCR running conditions [9 (link)] were followed, except that agarose gels were run for 80 min at 75 V. A GeneRuler 100 bp plus DNA ladder (Thermo Scientific, SM0323, Vilnius, Lithuania) was used as a size marker on each gel.
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Autotransporters
Bacterial Fimbria
Cultured Cells
Enterotoxins
Escherichia coli
Genes
Intrauterine Devices
Iron
Microbicides
Multiplex Polymerase Chain Reaction
Plasma Membrane
Plasmids
Proteins
Sepharose
Serum
Serum Proteins
Vagina
Virulence
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Ethidium bromide is a fluorescent dye commonly used in molecular biology laboratories. It is used to visualize and detect the presence of nucleic acids, such as DNA and RNA, in agarose gel electrophoresis.
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Cytofix/Cytoperm is a fixation and permeabilization solution developed by BD for use in flow cytometry and immunohistochemistry applications. It is designed to facilitate the intracellular staining of proteins and other cellular components while preserving cellular structure and antigenicity.
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RPMI is a type of cell culture medium that is widely used in biological research and cell-based assays. It provides a balanced salt solution and essential nutrients to support the growth and maintenance of a variety of cell types, including human and animal cells, in vitro.
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Streptomycin is a broad-spectrum antibiotic used to treat various bacterial infections. It is a product of the bacterium Streptomyces griseus and functions by inhibiting protein synthesis in susceptible microorganisms.
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The RIDASCREEN® SET Total is a quantitative enzyme-linked immunosorbent assay (ELISA) for the determination of staphylococcal enterotoxins A, B, C, D, and E in food samples. The test kit provides a reliable and standardized method for the detection of these toxins.
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More about "Enterotoxins"
Enterotoxins are powerful toxins produced by certain bacteria that can cause severe gastrointestinal illness in humans and animals.
These toxins disrupt the normal function of the intestinal epithelium, leading to distressing symptoms like diarrhea, vomiting, and abdominal pain.
Studying enterotoxins is crucial for understanding the mechanisms of foodborne illnesses and developing effective prevention and treatment strategies.
PubCompare.ai's AI-driven platform can help researchers optimize their research protocols for reproducibility and accuracy when investigating these important toxins.
The tool enables you to quickly locate and compare protocols from the literature, preprints, and patents, allowing you to identify the best approaches for your research and streamline your work to achieve more reliable results.
In addition to enterotoxins, researchers may also encounter related terms and concepts, such as Ethidium bromide (a DNA-binding dye used in molecular biology), Cytofix/Cytoperm (a fixation and permeabilization solution for flow cytometry), GolgiPlug (a protein transport inhibitor), RPMI (a commonly used cell culture medium), Streptomycin (an antibiotic), QIAamp DNA Mini Kit (a DNA extraction kit), FBS (Fetal Bovine Serum, a common cell culture supplement), RIDASCREEN® SET Total (a commercial kit for detecting enterotoxins), Duopath Cereus Enterotoxins (a rapid test for detecting Bacillus cereus enterotoxins), and Penicillin (an antibiotic commonly used in cell culture).
Understanding these related terms and techniques can help researchers effectively investigate the complex topic of enterotoxins and their effects.
These toxins disrupt the normal function of the intestinal epithelium, leading to distressing symptoms like diarrhea, vomiting, and abdominal pain.
Studying enterotoxins is crucial for understanding the mechanisms of foodborne illnesses and developing effective prevention and treatment strategies.
PubCompare.ai's AI-driven platform can help researchers optimize their research protocols for reproducibility and accuracy when investigating these important toxins.
The tool enables you to quickly locate and compare protocols from the literature, preprints, and patents, allowing you to identify the best approaches for your research and streamline your work to achieve more reliable results.
In addition to enterotoxins, researchers may also encounter related terms and concepts, such as Ethidium bromide (a DNA-binding dye used in molecular biology), Cytofix/Cytoperm (a fixation and permeabilization solution for flow cytometry), GolgiPlug (a protein transport inhibitor), RPMI (a commonly used cell culture medium), Streptomycin (an antibiotic), QIAamp DNA Mini Kit (a DNA extraction kit), FBS (Fetal Bovine Serum, a common cell culture supplement), RIDASCREEN® SET Total (a commercial kit for detecting enterotoxins), Duopath Cereus Enterotoxins (a rapid test for detecting Bacillus cereus enterotoxins), and Penicillin (an antibiotic commonly used in cell culture).
Understanding these related terms and techniques can help researchers effectively investigate the complex topic of enterotoxins and their effects.