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?7F). To assay for NF-��B activation, HEK293T cells transfected with the NF-��B reporter were challenged with L. pneumophila strains for 7?h and luciferase activity was determined and normalized to cfu to ensure that the readout was not affected by bacterial load (Experimental procedures). The deletion of ��legK1 did not affect NF-��B activity when assayed in this system (Fig.?8A). In contrast, the absence of ��lnaB modestly reduced NF-��B activation, and this phenotype could be complemented by re-integration of lnaB+ on the chromosome (Fig.?8B; t-test P-value http://en.wikipedia.org/wiki/Temsirolimus The double mutant lacking both lnaB and legK1 showed no further reduction in NF-��B activation (data not shown). Western blots of extracts probed with anti-LnaB serum demonstrated that the deletion mutant expressed no detectable LnaB, whereas the strain having a chromosomally encoded lnaB+ showed levels of expression equivalent to the wild-type Lp02 (Fig.?8C). The strains were grown to post-exponential phase prior to infection when LnaB is most highly expressed (Fig.?8D). Therefore the delivery of LnaB during L. pneumophila infection contributes to NF-��B activation when L. pneumophila is grown to post-exponential phase. http://www.selleckchem.com/screening/pfizer-licensed-library.html In this study we identified L. pneumophila IDTS that have an impact on host cell signalling when expressed within mammalian cells. A large swath of known and potential IDTS was chosen, based on either bioinformatics or the presence of an experimentally identified translocation signal, and plasmids encoding these genes were introduced into a screening system that allowed rapid identification of a phenotype. The NF-��B-luciferase screening procedure described here was developed because previous studies demonstrated that NF-��B activation was dependent on the presence of the Icm/Dot translocation system (Losick and Isberg, 2006; Abu-Zant et?al., 2007; Shin et?al., 2008). Here we demonstrate that several known IDTS http://www.selleckchem.com/products/pifithrin-alpha.html modestly activated an NF-��B-luciferase reporter, whereas two candidate IDTS expressed in cultured cells, LnaB and LegK1, resulted in robust activation. Full activation of this promoter after challenge of cells with post-exponential phase L. pneumophila required the presence of LnaB. In an approach that was similar to the one used here, LegK1 was shown to induce expression of an NF-��B reporter in cultured cells (Ge et?al., 2009). Interestingly LegK1 was shown to phosphorylate I��B in mammalians cells, although it is unclear whether this activity occurs during a natural infection, particularly in the natural host amoebae, which have no known NF-��B signalling systems. When legK1 was deleted, bacteria lacking this protein showed normal levels of NF-��B activation, suggesting that LegK1 may be a minor player in inducing NF-��B in vivo. Therefore, the exact role of this protein during Legionella infection is not known. The activation of NF-��B in response to low doses of L.