Novel Mycoplasma Agalactiae with new P30 Protein Pattern by Major Change in 17 Amino Acids

Abstract

M. agalactiae (Mycoplasma agalactiae) is the main agent of CA (contagious agalactia) that is primarily disease of dairy sheep and goats. In Iran, a three-valent Agalactia inactivated vaccine were prepared based on three M. agalactiae isolated from milk secretion of sheep and goat of Taleghan, Shiraz and Lorestan and preventive policies against CA disease founded in Razi Institute since 1966. The P30 is a specific and stable lipoprotein of  M. agalactiae. In this study, complete coding sequence of P30 gene of three Iranian vaccine strains and ten recently field isolates were analyzed in nucleotide and protein levels by bioinformatics tools. Interestingly, results observed a novel protein pattern K106VLKTKEIRLSQERKLS122 in P30 protein of vaccine strains compared to field isolates and the other available sequences in GenBank. Our findings demonstrated different B and T cell epitope patterns in Iranian vaccine strains. We suggested that the major change in P30 protein pattern may be occurred due to mutation during adaptation process in PPLO (Pleuropneumonia-Like Organisms) broth media.