Flagellin levels were determined as described previously41 (link). The bacterial suspension washed from the LB agar plate with PBS (10 ml, OD600nm = 0.6) was used to prepare flagellin by vigorous vortexing and subsequent centrifugation. Flagellin in the supernatant was precipitated with trichloroacetic acid (5%, w/v), separated on 12% SDS-PAGE and stained with Coomassie Brilliant Blue R (Sigma-Aldrich B7920).
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