MicrobiologyOpen is a broad scope, peer reviewed journal delivering rapid decisions and fast publication of microbial science. The journal gives priority to reports of quality research, pure or applied, that further our understanding of microbial interactions and microbial processes.
Editor-in-Chief, Pierre Cornelis has highlighted the papers below as of particular interest:
Unsuspected pyocyanin effect in yeast under anaerobiosis
Rana Barakat, Isabelle Goubet, Stephen Manon, Thierry Berges and Eric Rosenfeld
Summary: Toxicity of pyocyanin (PYO) was investigated under aerobiosis and anaerobiosis in several wild-type and mutant strains of the yeast Saccharomyces cerevisiae and also in Candida albicans. PYO is toxic for actively respiring cells but its toxicity was found to be important and even higher under anaerobiosis. This indicates that PYO effect can be mediated by other phenomenon than oxidative stress and respiratory disturbance.
Serum influences the expression of Pseudomonas aeruginosa quorum-sensing genes and QS-controlled virulence genes during early and late stages of growth
Cassandra Kruczek, Uzma Qaisar, Jane A. Colmer-Hamood and Abdul N. Hamood
Summary: In this study, we demonstrated that serum reduces the expression of different QS genes at early stages of growth but increases their expression at late stages of growth of P. aeruginosa. A similar phenomenon was observed regarding the production of autoinducers and the expression of QS-controlled virulence genes. Serum also differentially regulated the expression several positive and negative regulators of the QS systems. While the mechanism by which serum affects QS at early stage of growth is not yet known, our results suggest that serum accomplishes its effect at late stages of growth through the virulence factor regulator vfr.
Visualization of VirE2 protein translocation by the Agrobacterium type IV secretion system into host cells
Philippe A. Sakalis, G. Paul H. van Heusden and Paul J. J. Hooykaas
Summary: Here we report the direct visualization of VirE2 protein translocation from Agrobacterium into host cells. To this end we cocultivated Agrobacterium strains expressing VirE2 tagged with one part of a fluorescent protein with host cells expressing the complementary part. Fluorescent filaments became visible in recipient cells 20-25 hours after the start of the cocultivation indicative of VirE2 protein translocation.