Application of bacteriophage-displayed peptide libraries to study polysaccharide antigens of Aeromonas salmonicida

McCafferty, Calum Angus (1998) Application of bacteriophage-displayed peptide libraries to study polysaccharide antigens of Aeromonas salmonicida. MSc(R) thesis, University of Glasgow.

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Abstract

This thesis describes the application of bacteriophage displayed peptide libraries to the salmonid fish pathogen Aeromonas salmonicida. Antisera to both the capsular polysaccharide and lipopolysaccharide of A. salmonicida were used to select phage from 6-mer and 15-mer bacteriophage peptide libraries displayed in the p III protein of bacteriophage fd tet. When rabbit polyclonal anti-capsular polysaccharide antiserum was used for selection of phage from the 6-mer library, 140 phage were recovered by elution with glycine /HCl buffer (first round elution) and capsular polysaccharide solution in the second and third round of elution. Phage were amplified to high concentration and analysed by enzyme linked immunosorbent assay (ELISA) and the insert sequences determined Biopanning with anti-capsular polysaccharide antiserum selected a range of phage with peptide insert sequences which contained similar 3 to 4 amino acid motifs. The most predominant motif was 'serine-glycine-serine'. ELISA demonstrated that several of these phage bound to anti-capsular polysaccharide antiserum suggesting that these phage peptide sequences might antigenically mimic some capsular polysaccharide epitopes to which antibodies were present in the antiserum. A monoclonal antibody to A. salmonicida lipopolysaccharide was also used for biopanning with the 6-mer library and this selected phage with sequences which could be classified into groups, several containing identical sequences and others with similar motifs. ELISA assays to detect binding of these phage to lipopolysaccharide antiserum were inconclusive. Several selected with anti-lipopolysaccharide monoclonal antibody displayed peptides similar to those selected by polyclonal anti-capsular polysaccharide antiserum, which may reflect the similar monosaccharide composition of these related polysaccharides.

Item Type: Thesis (MSc(R))
Qualification Level: Masters
Additional Information: Adviser: Harry T Birkbeck
Keywords: Animal diseases, Aquatic sciences
Date of Award: 1998
Depositing User: Enlighten Team
Unique ID: glathesis:1998-71566
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 10 May 2019 14:16
Last Modified: 10 May 2019 14:16
URI: http://theses.gla.ac.uk/id/eprint/71566

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