Figure 4
Comparison of the parent, Tako and Ika propeller structures. (a) The overall β-propeller domain is depicted as a cartoon coloured from blue to red from the N-terminus to the C-terminus. (b) Superposition of the individual blades of the different proteins indicates that the parent protein does not exhibit a conserved backbone geometry, while the eight blades of Tako8 can be perfectly aligned. In the case of Ika8 only the alternating a and b repeats can be perfectly aligned. The differences in symmetry are also clear from the electrostatic potential as calculated by APBS (Touw et al., 2015; Kabsch & Sander, 1983; Jurrus et al., 2018) (c). In the case of Tako8 the interior of the toroid is clearly highly negatively charged, while for Ika8 the charges are more evenly distributed. |