Epitope Mapping of potential novel immunogenic proteins of Klebsiella pneumoniae MGH 78578
Ontology highlight
ABSTRACT:
ORGANISM(S): Klebsiella pneumoniae
SUBMITTER: Sebastian Hoppe
PROVIDER: E-GEOD-52537 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:A number of seven proteins were selected during immunoscreening and further analyses. The proteins were in silico divided into overlapping 15-mer oligopeptides with an overlap of 11 residues. The microarrays were incubated with different antibodies to C. jejuni, Escherichia coli and Salmonella enterica. Each microarray was separated into three individual incubation chambers using ProPlate 3-Well modules. Within each incubation chamber, each peptide was spotted in triplicate with the controls spotted nine times each. The controls included human-IgG, rabbit-IgG, mouse-IgG and myelin basal protein (MBP). Each chamber was incubated independently using different polyclonal antibodies to C. jejuni, and for specificity testing, with an antibody to E. coli or S. enterica. Thus, samples 4_1, 4_2, 5_1 and 5_2 represent epitope mapping of three proteins with C. jejuni antibodies, while 6_1, 6_2, 7_1 and 7_2 represent the data after incubation with an E. coli antibody investigating unspecific interactions of the antibody to the potential linear epitopes from C. jejuni. Finally, for four different proteins from C. jejuni, the set two indicated by S2 was performed. Here, S2_6_1, S2_7_1, S2_7_2, S2_8_1 and S2_8_2 indicate epitope mapping after incubation with antibodies to C. jejuni, while the remaining samples were performed to test these latter 4 proteins for specificity by incubation with antibody to S. enterica.
2013-04-06 | E-GEOD-45542 | biostudies-arrayexpress
Project description:A short sequence of 11 amino acids belonging to the cj0669 protein from Campylobacter jejuni NCTC 11168, which was previously identified as potentially immunogenic, was analyzed via alanine scanning to narrow down the significant amino acid residues within the sequence. Twelve peptides, one representing the original sequence and eleven peptides with each residue replaced by alanine in turn, were synthesized on microarrays by JPTs Pepstar Technology. For each microarray, nine replicates for each peptide were spotted. The microarray was separated into three incubation chambers by the ProPlate 3-well module (Grace Biolabs) to allow for incubation with different antibodies in parallel. For specific interactions, rabbit polyclonal IgG to C. jejuni was used, while unspecific binding to the epitope sequence was checked using rabbit polyclonal IgG to Salmonella enterica.
2013-04-06 | E-GEOD-45556 | biostudies-arrayexpress
Project description:A short sequence of 11 amino acids belonging to the cj0669 protein from Campylobacter jejuni NCTC 11168 which was previously identified as potentially immunogenig was analyzed via alanine scanning to narrow down the significant amino acid residues within the sequence. Twelve peptides, one representing the original sequence and eleven peptides with each residue replaced by alanine in turn, were synthesized on microarrays by JPTs Pepstar Technology. For each microarray, nine replicates for each peptide were spotted. The microarray was seperated into three incubation chambers by the ProPlate 3-well module (Grace Biolabs) to allow for incubation with different antibodies in parallel. For specific interaction rabbit polyclonal IgG to C.jejuni was used, while non-specific binding to the epitope sequence was checked using rabbit polyclonal IgG to H. pylori (Abcam ab20459).
2013-05-06 | E-GEOD-46651 | biostudies-arrayexpress
Project description:This SuperSeries is composed of the SubSeries listed below. Refer to individual Series
2013-04-06 | E-GEOD-44717 | biostudies-arrayexpress
Project description:Screening of 14 novel proteins derived from Klebsiella pneumoniae MGH 78578 identified prior via screening of cDNA libraries. The full-length proteins were attached using a specific HaloTag to their corresponding ligand surface, HaloLink. Screening was performed using two different polyclonal antibodies to Klebsiella pneumoniae (Acris AP00792PU-N and Abcam ab20947) and detection achieved by Goat polyclonal to rabbit IgG conjugated with Chromeo-546 (Abcam ab60317). In order to assess their potential immungenic nature and rank the proteins investigated, comparative analysis using already described antigens from K. pneumoniae were used in the assay. Each microarray was seperated into different incubation chambers using the 16-well ProPlate (Grace Biolabs) multi-well gaskets. As positive references ompA and mdh were used. For negative control gapA was used and the crude lysates of the expression host (Acella E.coli) and buffer were spotted as well.Samples and controls were spotted with five replicates each. Incubation was performed using different antibodies reactive to K. pneumoniae.
2014-02-02 | E-GEOD-52538 | biostudies-arrayexpress
Project description:Screening of 22 novel proteins derived from Campylobacter jejuni NCTC 11168 identified prior via screening of cDNA libraries. The full-length proteins were attached using a specific HaloTag to their corresponding ligand surface, HaloLink. Screening was performed using three different polyclonal antibodies to Campylobacter jejuni and detection was achieved by goat polyclonal antibody to rabbit IgG conjugated with Chromeo-546. In order to assess their potential immungenic nature and rank the proteins investigated, comparative analysis using already described antigens from C. jejuni were used in the assay. Each microarray was separated into different incubation chambers using the ProPlate (Grace Biolabs) multi-well gaskets. While for two slides (2009 and 2447), three chambers were used, the remaining slides were designed to use 16 different compartments. Each compartment could be incubated with different antibodies and represent individual replicates of the slides. As positive references, hisJ and cjaA were used. For negative controls, argC and gapA were used, and the crude lysates of the expression host (Acella E. coli) and buffer were spotted as well. For slides 2009 and 2447, three-well gaskets were used allowing for seven replicates per sample, while only incubation with one antibody. Slides 416033 and 416826 used 16-well gaskets and only hisJ and argC as protein references. Samples and controls were spotted in quadruplicate. Finally, for 1000 and 1001, samples were spotted in triplicate, whereas controls were spotted in quadruplicate using hisJ, cjaA, argC and gapA as protein references.
2013-04-06 | E-GEOD-45520 | biostudies-arrayexpress
Project description:A number of six proteins were selected during immunoscreening and further analyses. The proteins were divided in silico into overlapping 15-mer oligopeptides with an overlap of 11 residues. The microarrays were incubated with different antibodies to K. pneumoniae, C. jejuni and S. aureus.
2014-02-02 | GSE52537 | GEO
Project description:The screening of a cDNA derived expression library of Salmonella Enteritidis 125109 expressed in E. coli using a fusion construct and specific HaloTag interaction to a modified surface is shown. Thus, 1536 different clones were screened including positive (fimA) and negative (argC, gapA) reference proteins. The goal of the screening was to identify potential novel immunogenic proteins from S. Enteritidis by selecting clones showing a high signal intensity in comparison to the known antigens used as positve markers. Afterwards, the most promising clones were sequenced to identify the gene and corresponding protein and these proteins were then investigated further. Consequently, 9 novel immunogenic proteins could be identified. In total 1536 different lysates were spotted on different microarray slides. Each slides contained 3600 distinct spots, seperated into two compartments of 1800 spots each. Each compartment comprised quadruplicate replicates of each sample lysate with controls being analysed with more replicates. As controls we used: fimA from 3 different samples (40 replicates) as positive reference proteins, as it has been described as immunogenic before. GapA from Klebsiella pneumoniae and Campylobacter jejuni (40 replicates) as negative reference proteins, additionally two sets of E.coli cell lysates without fusionprotein expressed, namely Acella electrocompetent cells (40 replicates) and KRX (32 replicates). Last but not least a buffer control (24 replicates) was included. Therefore, each set of replicate slides contained 384 different samples. Each screening was performed with three replicate slides. Consequently, a total number of 12 slides were screened (4 sets of samples x 3 replicates each). For identification rabbit polyclonal antibody to S. enterica (Abcam ab35156) as primary and Goat polyclonal to Rabbit IgG conjugated with ChromeoTM-546 (Abcam ab60317) as secondary antibody were used. The top compartment was incubated first with primary antibody, while the bottom compartment was incubated with PBS at the same time. Afterwards both compartments were incubated with secondary antibody.
2013-10-01 | E-GEOD-49605 | biostudies-arrayexpress
Project description:Detection of immunogenic proteins remains an important task for life sciences as it nourishes the understanding of pathogenicity, illuminates new potential vaccine candidates and broadens the spectrum of biomarkers applicable in diagnostic tools. Traditionally, immunoscreenings of expression libraries via polyclonal sera on nitrocellulose membranes or screenings of whole proteome lysates in 2-D gel electrophoresis are performed. However, these methods feature some rather inconvenient disadvantages. Screening of expression libraries to expose novel antigens from bacteria often lead to an abundance of false positive signals owing to the high cross reactivity of polyclonal antibodies towards the proteins of the expression host. A method is presented that overcomes many disadvantages of the old procedures. We incorporated a fusion tag prior to our genes of interest and attached the expressed fusion proteins covalently on microarrays. This enhances the specific binding of the proteins compared to nitrocellulose. Thus, it helps to reduce the number of false positives significantly. It enables us to screen for immunogenic proteins in a shorter time, with more samples and statistical reliability. We validated our method by employing several known genes from Campylobacter jejuni NCTC 11168. Four of proteins that have previously been described as immunogenic have successfully been assessed immunogenic abilities with our method. One protein with no known immunogenic behaviour before suggested potential immunogenicity. The method presented offers a new approach for screening of bacterial expression libraries to illuminate novel proteins with immunogenic features. It could provide a powerful and attractive alternative to existing methods and help to detect and identify bacterial virulence factors, vaccine candidates and potential biomarkers. The overall study was done with five technical replicates. Ten proteins derived from Campylobacter jejuni were tested regarding their immunogenic potential. The ten proteins derived from Campylobacter jejuni were fusion proteins, i.e., N-terminal HaloTag fused to: Gene <--> Protein cjaA <--> putative amino-acid transporter periplasmic solute-binding protein hisJ <--> histidine-binding protein precursor pal <--> peptidoglycan associated lipoprotein flaC <--> flagellin flaA <--> flagellin peb1a <--> bifunctional adhesin/ABC transporter aspartate/glutamate-binding protein pyrC <--> dihydroorotase (EC:3.5.2.3) pseB <--> UDP-GlcNAc-specific C4,6 dehydratase/C5 epimerase gapA <--> glyceraldehyde 3-phosphate dehydrogenase (EC:1.2.1.12) argC <--> N-acetyl-gamma-glutamyl-phosphate reductase (EC:1.2.1.38)
2011-10-26 | E-GEOD-33295 | biostudies-arrayexpress
Project description:The screening of a cDNA derived expression library of Campylobacter jejuni NCTC 11168 expressed in E. coli using a fusion construct and specific HaloTag interaction to a modified surface is shown. 1536 different clones were screened including positive (hisJ, cjaA, peb1a) and negative (argC, pyrC, gapA) reference proteins. The goal of the screening was to identify potential novel immunogenic proteins from C. jejuni by selecting clones showing a high signal intensity in comparison to the known antigens used as positive markers. Afterwards, the most promising clones were sequenced to identify the gene and corresponding protein, and these proteins were then investigated further. Consequently, 22 novel immunogenic proteins could be identified. In total, 1536 (4 x 384) different lysates were spotted on different microarray slides. Each slide contained 3600 distinct spots, separated into two compartments of 1800 spots each. Each compartment comprised quadruplicate replicates of each sample lysate with controls being analysed with more replicates. As controls we used: hisJ, cjaA and peb1 (3 x 40 replicates) as positive reference proteins, as they have been described as immunogenic before; argC and pyrC (2 x 40 replicates) as negative reference proteins; two sets of E. coli cell lysates without fusion proteins expressed, namely Acella electrocompetent cells (40 replicates) and KRX (32 replicates); and a buffer control (24 replicates). Therefore, each set of replicate slides contained 376 different samples and 8 controls. Each screening was performed with three replicate slides. Consequently, a total number of 12 slides were screened (4 sets of samples x 3 replicates each). For identification, rabbit polyclonal antibody to C. jejuni (Acris AP24002PU-N) as primary and goat polyclonal to rabbit IgG conjugated with ChromeoTM-546 (Abcam ab60317) as secondary antibody were used. The top compartment was incubated first with primary antibody, while the bottom compartment was incubated with PBS at the same time. Afterwards, both compartments were incubated with secondary antibody.
2013-04-06 | E-GEOD-45268 | biostudies-arrayexpress