Christodoulides, Myron, De oliveira, Daysiane, Cleary, David W., Humbert, Maria victoria, Machado-De-Ávila, Ricardo a. and La ragione, Roberto m. (2022) An in silico reverse vaccinology study of Brachyspira pilosicoli, the causative organism of intestinal spirochaetosis, to identify putative vaccine candidates. Process Biochemistry, 122, 128-148. (doi:10.1016/j.procbio.2022.08.014).
Abstract
Brachyspira pilosicoli is a zoonotic bacterium that can cause intestinal spirochaetosis (IS) in avian species (AIS), pigs (PIS) and humans (HIS). In the absence of vaccines to prevent infections, we used genome-based reverse vaccinology (RV) to identify putative B. pilosicoli vaccine candidates. Genome sequence of B. pilosicoli strain B2904, an AIS isolate, was analysed with PSORTb3, CELLO, SOSUIGramN, LipoP, SignalP-5.0, TMHMM, BLAST 2.12.0 + , PDB database, SEED Viewer, eggNOG-mapper, UniProt, VaxiJen and Vaxign2, and Tblastn to generate a RV list of putative vaccine candidates. We also generated a linear B-cell chimera antigen using Blast-p, Emini Surface Accessibility Prediction, ABCpred, Expasy ProtParam and PepCalc programs. RV defined a list of 162 proteins containing 48 Outer Membrane (OM), 27 OM/Extracellular, 27 Extracellular, 4 Periplasm, 2 Surface, 2 Cytoplasm and 52 Unknown proteins. The list was characterised by an abundance of SPII lipoproteins. We found that genes encoding amino acid sequences of 146/162 (90%) proteins were present in 19 other B. pilosicoli genomes. A linear B-cell chimera antigen was generated from the amino acid sequences of 18 OM and Extracellular proteins. Our contemporary RV study represents a starting point for a comprehensive vaccine development strategy for preventing intestinal spirochaetosis.
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