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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., 2015BB50; Kabsch & Sander, 1983BB21; Jurrus et al., 2018BB18) (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.

IUCrJ
ISSN: 2052-2525