Abstract
Mycoplasma mobile, a pathogen of freshwater fish, glides easily across surfaces, colonizes on the fish gill, and causes necrosis. The cell surface is differentiated into three parts: the head, neck, and body. Mobile variable surface proteins (Mvsps) localizing at each of these parts may be involved in surface variation including phase variation and antigenic variation, although no proof exists. In this study, we examined this possibility by focusing on MvspI, the largest Mvsp. Immunofluorescence microscopy showed that MvspI is expressed on the surfaces of all cells. When anti-MvspI antibody was added at concentrations over 0.8 nM, MvspI was observed to decrease over time. After 72 h of cultivation with the antibody, the fluorescence intensity and amount of MvspI decreased up to 13 and 39%, respectively, compared to those of cells grown without antibody. These changes were reversed by the removal of the antibody. Such effects were not observed when another antibody targeting other Mvsps was used, suggesting that the decrease is specific to the relationship between MvspI and the antibody. Cell growth was also inhibited by the antibody, but the decrease in MvspI could not be explained by the selective growth of MvspI-negative variants or by the inhibition of growth with other conditions. The decrease in MvspI caused by the antibody binding may suggest a novel type of surface variation, designated here as “mycoplasmal antigen modulation.”
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Acknowledgments
The authors are grateful to Mr. Adan-Kubo Jun for helpful discussions. This study was supported by a Grant-in-Aid for Scientific Research (A) (to Makoto Miyata) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan, and by a grant from the Institution for Fermentation Osaka (to Makoto Miyata).
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Wu, H.N., Kawaguchi, C., Nakane, D. et al. “Mycoplasmal Antigen Modulation,” a Novel Surface Variation Suggested for a Lipoprotein Specifically Localized on Mycoplasma mobile . Curr Microbiol 64, 433–440 (2012). https://doi.org/10.1007/s00284-012-0090-y
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DOI: https://doi.org/10.1007/s00284-012-0090-y