1887

Abstract

is an opportunistic pathogen that primarily infects cystic fibrosis patients. Previously we have reported that mutations in , a LysR-type transcriptional regulator, and ShvR-regulated genes BCAS0208 and BCAS0201 (designated and , respectively) affect colony morphotype, biofilm and pellicle formation and virulence in . In this study we investigated the role of and in influencing lipid-metabolism-associated phenotypes. As previously reported for K56-2Δ, the Δ2 and  : :  mutants had no antifungal activity against and suggesting that these genes are involved in synthesis of a membrane-associated antifungal lipopeptide. Strains Δ2 and  : :  had reduced swarming motility and altered cell membrane morphology, both of which were restored to wild-type levels upon providing these genes . Both K56-2Δ and Δ2 showed increased uptake of the hydrophobic fluorescent probe -phenylnaphthylamine (NPN), indicating altered outer membrane properties. Total lipid profiles determined by TLC revealed distinct differences in cellular lipid compositions of K56-2Δ, Δ2 and  : :  compared with K56-2. Taken together, these results indicate that and are involved in metabolic pathway(s) influencing lipid profiles and affect both cell surface and antifungal properties of . .

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2013-03-01
2021-10-24
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