Rhodomyrtone decreases Staphylococcus aureus SigB activity during exponentially growing phase and inhibits haemolytic activity within membrane vesicles

Rhodomyrtone decreases Staphylococcus aureus SigB activity during exponentially growing phase and inhibits haemolytic activity within membrane vesicles

Sigma factor B (SigB) controls the expression of Staphylococcus aureus genes including virulence factors and plays a role in the bacterial secretion system through membrane vesicle production. Inhibition of SigB could attenuate SigB dependent virulence and secretion system. The objective of this stu...

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Veröffentlicht in:Microbial pathogenesis 2019-03, Vol.128, p.112-118
Hauptverfasser: Mitsuwan, Watcharapong, Jiménez-Munguía, Irene, Visutthi, Monton, Sianglum, Wipawadee, Jover, A., Barcenilla, F., García, M., Pujol, M., Gasch, O., Domínguez, M.A., Camoez, M., Dueñas, C., Ojeda, E., Martínez, J.A., Marco, F., Chaves, F., Lagarde, M., López-Medrano, F., Montejo, J.M., Bereciertua, E., Hernández, J.L., von Wichmann, M.Á., Goenaga, A., García-Arenzana, J.M., Padilla, B., Padilla, C., Cercenado, E., García-Prado, G., Tapiol, J., Horcajada, J.P., Montero, M., Salvadó, M., Arnáiz, A., Fernández, C., Calbo, E., Xercavins, M., Granados, A., Fontanals, D., Pintado, V., Loza, E., Torre-Cisneros, J., Lara, R., Rodríguez-López, F., Natera, C., Blanco, J.R., Olarte, I., Benito, N., Mirelis, B., Murillas, J., Ruiz de Gopegui, E., Espejo, H., Morera, M.A., Rodríguez-Baño, J., López-Cortés, L.E., Pascual, A., Martín, C., Lepe, J.A., Molina, J., Sordé, R., Almirante, B., Larrosa, N., Rodríguez-Ortega, Manuel J., Voravuthikunchai, Supayang P.
Format: Artikel
Sprache:eng
Schlagworte:
Haemolytic activity
Membrane vesicles
Rhodomyrtone
SigB
Staphylococcus aureus
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Zusammenfassung:Sigma factor B (SigB) controls the expression of Staphylococcus aureus genes including virulence factors and plays a role in the bacterial secretion system through membrane vesicle production. Inhibition of SigB could attenuate SigB dependent virulence and secretion system. The objective of this study was to determine the effects of rhodomyrtone on SigB and virulence factors related to SigB. Minimal inhibitory concentration (MIC) and minimal bactericidal concentration (MBC) values of rhodomyrtone against 67 clinical methicillin-resistant S. aureus isolates were 0.25–8 μg/ml, which were similar to those of vancomycin. Using luciferase gene fused to SigB dependent promoters of asp23, five time reduction in SigB activity was observed when the bacteria were treated with rhodomyrtone for 3 h. Rhodomyrtone significantly reduced SigB activity in a concentration dependent manner in exponentially growing cells (P 
ISSN:0882-4010
1096-1208
DOI:10.1016/j.micpath.2018.12.019