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phagocytophilum during infection was seen as a punctate ring on the membrane of the bacterial inclusion (Fig.?2F). Individual A. phagocytophilum also stained for AptA (Fig.?S3A). Subsequently we determined the kinetics of AptA expression during infection. As shown in Fig.?2G, until 12?h post infection, http://en.wikipedia.org/wiki/MERTK there was barely any detectable expression of AptA in infected cells. However, during the active multiplication of bacteria (at around 24?h onwards), strong expression of AptA was detected. Interestingly, the expression of AptA seems to be coincident with the formation of A. phagocytophilum inclusions. Furthermore, immuno-EM studies demonstrated the presence of AptA on the surrounding vacuolar membrane as well as the cytoplasmic region adjoining the vacuole (Fig.?2H, Fig.?S3B). Taken together, these results indicate that AptA colocalizes with A. phagocytophilum inclusions during infection. We reasoned that the ability of AptA to inhibit yeast growth http://www.selleckchem.com/products/Imatinib-Mesylate.html is likely due to its interference with a conserved eukaryotic cellular pathway. Therefore we systematically investigated whether any such aspects of yeast cells are altered by AptA expression. Staining for yeast nuclei, mitochondria, endoplasmic reticulum, plasma membrane and actin showed that all these structures are unaltered by expression of AptA (data not shown). We then investigated whether expression of AptA activates or inhibits MAP kinase signalling pathways. Yeast encode six MAP kinase pathways (Gustin et?al., 1998) that normally exhibit minimal activity when the yeast are grown under standard laboratory conditions. However, we observed that expression of AptA resulted in activation of one of these highly conserved eukaryotic MAPK signalling cascades, the yeast cell wall integrity pathway. As shown in Fig.?3A, expression of AptA resulted in the phosphorylation (3.8-fold by the software ImageJ, http://rsbweb.nih.gov/ij/) of Mpk1, the terminal MAPK in this pathway. Furthermore, expression of AptA resulted in the activation of Rlm1, a transcription factor activated by induction of the cell wall integrity pathway. As shown in Fig.?3B, expression of AptA increased the activity of Rlm1 transcription reporter http://www.selleckchem.com/products/AP24534.html 35-fold (P?