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Volume 147, Issue 11

secretion kinetics of proteins from in comparison to proteins from non- species Free

Abstract

It has been shown that the loss of PilD, a prepilin peptidase necessary for type IV pilus biogenesis and establishment of the type II secretion apparatus is associated with loss of virulence in . is the species most frequently associated with Legionnaires’ disease, but virulence factors unique to this species are not known, so the secretion kinetics of several -dependent enzyme activities, including protease, acid phosphatase, phospholipase A (PLA) and lysophospholipase A (LPLA), of and non- species were compared during growth in BYE broth. Enzyme activity appeared during mid-exponential growth phase and reached maximal levels on entry into stationary growth phase. None of the enzyme activities were unique to and it did not exclusively secrete the highest amounts of the hydrolytic proteins. However, the timing of PLA and LPLA secretion in differed compared to other species. PLA activity was secreted prior to LPLA activity in , which may lead to an accumulation of the cytotoxic agent lysophosphatidylcholine (LPC). In addition to , several other species, including and , were able to enrich for LPC due to a very potent PLA activity accompanied by only moderate LPLA activity. These species, in contrast to , have not been shown to multiply within monocytic host cells. Thus none of the secreted enzymic activities investigated were unique to , nor were they secreted at high concentrations. However, the timing of PLA and LPLA secretion may contribute to pathogenicity.

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  • Accepted:
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  • Published Online:
Keyword(s): CS, culture supernatant , DPPC, dipalmitoylphosphatidylcholine , DPPG, dipalmitoylphosphatidylglycerol , exotoxins , FFA, free fatty acid , intracellular bacteria , LPC, lysophosphatidylcholine , LPLA, lysophospholipase A , lysophospholipase A , MPLPC, monopalmitoyllysophosphatidylcholine , p-NPP, p-nitrophenylphosphate , phospholipase A , PLA, phospholipase A and virulence
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2001-11-01
2024-04-24
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In vitro secretion kinetics of proteins from Legionella pneumophila in comparison to proteins from non-pneumophila species
Microbiology 147, 3127 (2001); https://doi.org/10.1099/00221287-147-11-3127
/content/journal/micro/10.1099/00221287-147-11-3127
/content/journal/micro/10.1099/00221287-147-11-3127
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