Fig. 1

Overall structure and repeat domains of EccB_1mt. a Domain organization of EccB₁. The predicted transmembrane helix is indicated by a shaded rectangle. The protein variants used for structure determination are shown as horizontal lines. b Overall structure of EccB_1mt. The structure is shown in cartoon representation with the central core domain in grey and repeats domains R1-R4 colored red, orange, green, and blue, respectively. The disulfide bond between Cys150 and Cys345 is shown as yellow spheres. c Repeat domains R1–R4 have a common fold. The isolated repeat domains are shown in the same orientation after superposition of repeats R2-R4 on repeat R1 using Chimera [52]