After several washes in PBS to remove unbound phalloidin conjugate, coverslips were mounted onto microscopy slides using Vectashield mounting medium containing DAPI (Vector Laboratories). Samples were analysed using a ZEISS LSM510 Meta confocal-laser

scanning microscope. Galleria mellonella killing assays Wax moth larvae (Galleria mellonella) were Vorinostat concentration purchased from AP26113 price Livefood UK Ltd (Rooks Bridge, Somerset, UK) and were maintained on wood chips in the dark at 15°C until used. Bacteria from overnight cultures were adjusted to a known concentration in PBS and a Hamilton syringe was used to inject 10 μl aliquots of this suspension into G. mellonella larvae. Injections were performed into the haemocoel of 10 larvae per bacterial strain via the foremost left proleg. Control larvae were either injected with 10 μl of PBS in order to measure any potential lethal effects of the injection process, or not injected to measure the effects of the incubation procedure. After injection, larvae were incubated statically at 37°C inside petridishes and the number of dead larvae was scored periodically.

Larvae were considered dead when they displayed no movement in response to gentle prodding with a pipette tip. To determine intracellular bacterial numbers, infected larvae were placed on ice for 20 mins before the bottom 2 mm of each larva was aseptically removed and the haemocoel was drained into a sterile 1.5 ml microcentrifuge tube on ice. This was then serially diluted in LB medium and appropriate

BMN 673 in vivo dilutions were plated out onto LB agar plates supplemented with gentamicin, which were incubated overnight at 37°C to allow bacteria to grow. All experiments were carried out in triplicate. Statistical analysis Differences between mean values were tested for significance 4-Aminobutyrate aminotransferase by performing unpaired, two-tailed Student’s t-tests using the GraphPad Prism software version 5.01 (GraphPad Software, San Diego California USA). Acknowledgements MEW, RWT and SLM were funded by the Ministry of Defence (grant number DSTLX-1000026866). CMM and RWT were funded by the Wellcome Trust (grant number WT085162AIA). References 1. Dance DA: Melioidosis. Revs Med Microbiol 1990, 1: 143–150. 2. Wiersinga WJ, van der Poll T, White NJ, Day NP, Peacock SJ: Melioidosis: insights into the pathogenicity of Burkholderia pseudomallei . Nat Rev Micro 2006, 4 (4) : 272–282.CrossRef 3. Wuthiekanun V, Peacock SJ: Management of melioidosis. Expert Rev Anti Infect Ther 2006, 4: 445–455.PubMedCrossRef 4. Ngauy V, Lemeshev Y, Sadkowski L, Crawford G: Cutaneous melioidosis in a man who was taken as a prisoner of war by the Japanese during World War II. J Clin Microbiol 2005, 43 (2) : 970–972.PubMedCrossRef 5. Choy JL, Mayo M, Janmaat A, Currie BJ: Animal melioidosis in Australia. Acta Trop 2000, 74 (2–3) : 153–158.PubMedCrossRef 6. Hicks CL, Kinoshita R, Ladds PW: Pathology of melioidosis in captive marine mammals. Aust Vet J 2000, 78 (3) : 193–195.PubMedCrossRef 7.