Figure 3. Effect of oxidants on microtubule polymerization.
Tubulin samples (25 μM, 500 μM cys, final reaction volume = 50 μl) were treated with each oxidant for 10 min at RT and excess oxidant was scavenged with 1 mM met. GTP (1 mM final) was added and the samples were incubated at 37 °C for 22 min. Microtubule polymer was collected by centrifugation at 16000 x g for 20 min. The protein concentration in each supernatant was measured using the BCA reagent. The results represent the mean of at least three independent experiments performed in duplicate.