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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.

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