Killing Assay. Bacterial strains were grown as lawns on LB-agar plates with the appropriate antibiotics. Rifampicin-resistant prey and rifampicin-sensitive predator were harvested and mixed at an MOI of 10 with volumes normalized by OD600 readings. Twenty-five microliters of the mixed bacterial culture was spotted onto prewarmed LB agar and incubated at 37 °C for 1–4 h, except for S. cerevisiae, which was incubated at 30 °C. Bacterial spots were harvested and the cfu per milliliter of surviving prey and predator were measured by serial dilution and selective growth on agar containing 50 μg·mL−1 rifampicin and 100 μg·mL−1 streptomycin, respectively. Complementation experiments were performed by cloning the respective genes into a pBAD24 vector with arabinose-induced expression on LB-agar plates containing
0.1% arabinose.