After a 2-hr incubation (i.e. 3-hr post infection), the wells of one tissue culture plate were Lorlatinib washed, J774A.1 cells were lysed with a solution containing Saponin, and serial dilutions of the well contents were spread onto agar plates to determine the number of bacteria phagocytosed by the macrophages. The wells of the other tissue

culture plate were washed once, fresh medium without antibiotics was added, and the plate was incubated for an additional 5-hr. Following this incubation (i.e. 8-hr post-infection), the wells were processed as described above in order to enumerate bacteria. These experiments were repeated on at least 3 separate occasions. Statistical analyses were performed using the Mann-Whitney test (GraphPad Prism software) and P values < 0.05 are reported as statistically significant.

Epithelial cell invasion and survival assays These experiments were performed as described above for macrophage survival assays with some modifications. Specifically, epithelial cells were infected with an MOI of 100. The inoculated tissue culture plates were centrifuged and incubated for 3-hr at 37°C, time after which the medium covering the monolayers was replaced with fresh tissue culture medium containing 50 μg/ml gentamicin. After a 2-hr incubation (i.e. HDAC inhibitor 5-hr post infection), the wells of one tissue culture plate were washed and processed to enumerate intracellular bacteria as described above. The wells of the other tissue culture plate were washed once, fresh medium without antibiotics was added to wells, and the plate was incubated for an additional 3-hr. Following this incubation (i.e.

8-hr post-infection), the wells were processed as described above. These experiments were repeated on at least 3 separate occasions. Statistical analyses were performed using the Mann-Whitney test (GraphPad Prism software) and P values < 0.05 are reported as statistically significant Protein preparations, western blot, and antibody production Sarkosyl-insoluble Anacetrapib OM proteins were obtained as previously described by Carlone et al [103]. The methods used to prepare whole cell lysates and perform western blot experiments are described elsewhere [61, 62, 67, 104, 105]. To obtain antibodies directed against BoaA, the peptide PEPA (NYLGGLFGFGPQTSMANWGDSSN) was synthesized and conjugated to maleimide-activated keyhole limpet hemocyanin (mcKLH, Thermo Scientific) under the manufacturer’s recommended conditions. The sequence of PEPA corresponds to residues 78-100 of B. pseudomallei DD503 BoaA and encompasses aa 79-101 of B. mallei ATCC23344 BoaA (underlined residues in the PEPA sequence being perfectly conserved). The mcKLH-PEPA conjugate was emulsified in Freund’s adjuvants and used to immunize female BALB/c mice as previously reported [106].