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J Vet Sci 2018; 19(2): 188-199  https://doi.org/10.4142/jvs.2018.19.2.188
In silico analysis of putative drug and vaccine targets of the metabolic pathways of Actinobacillus pleuropneumoniae using a subtractive/comparative genomics approach
Biruk T. Birhanu1, Seung-Jin Lee1, Na-Hye Park1, Ju-Beom Song2, Seung-Chun Park1,*
1Laboratory of Veterinary Pharmacokinetics and Pharmacodynamics, College of Veterinary Medicine, and 2Department of Chemistry Education, Teachers College, Kyungpook National University, Daegu 41566, Korea
Correspondence to: Tel: +82-53-950-5964; Fax: +82-53-950-5955; E-mail: parksch@knu.ac.kr
Received: May 24, 2017; Revised: August 4, 2017; Accepted: October 7, 2017; Published online: March 31, 2018.
Abstract
Actinobacillus pleuropneumoniae is a Gram-negative bacterium that resides in the respiratory tract of pigs and causes porcine respiratory disease complex, which leads to significant losses in the pig industry worldwide. The incidence of drug resistance in this bacterium is increasing; thus, identifying new protein/gene targets for drug and vaccine development is critical. In this study, we used an in silico approach, utilizing several databases including the Kyoto Encyclopedia of Genes and Genomes (KEGG), the Database of Essential Genes (DEG), DrugBank, and Swiss-Prot to identify non-homologous essential genes and prioritize these proteins for their druggability. The results showed 20 metabolic pathways that were unique and contained 273 non-homologous proteins, of which 122 were essential. Of the 122 essential proteins, there were 95 cytoplasmic proteins and 11 transmembrane proteins, which are potentially suitable for drug and vaccine targets, respectively. Among these, 25 had at least one hit in DrugBank, and three had similarity to metabolic proteins from Mycoplasma hyopneumoniae, another pathogen causing porcine respiratory disease complex; thus, they could serve as common therapeutic targets. In conclusion, we identified glyoxylate and dicarboxylate pathways as potential targets for antimicrobial therapy and tetra-acyldisaccharide 4'-kinase and 3-deoxy-D-manno-octulosonic-acid transferase as vaccine candidates against A. pleuropneumoniae.
Keywords: Actinobacillus pleuropneumoniae, drug target, in silico, metabolic networks and pathways, vaccine target


© 2018 The Korean Society of Veterinary Science.

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