Extended Data Fig. 9 ∣. MTBH1-2 promotes tubulin polymerization and mutation of residues in the three cationic clusters impairs this activity.
a. Quantification of tubulin polymerization over time in the absence or presence of MTBH1-2 and the structure-guided MTBH1-2 mutants. b–f. Representative interference reflection microscopy images from one of two independent experiments of reactions containing 10 μM porcine tubulin without MTBH1-2 (b) or with 2.5 μM MTBH1-2 (c), 2.5 μM MTBH1-2 (K490A/K494A) (d), 25 μM MTBH1-2 (K490A/K494A) (e) and 25 μM MTBH1-2 (K490A/K494A/K498A/K502A) (f). Scale bar, 25 μm.