Fig. 8.
The CheY from M. maripaludis shows archaeal-specific adaptations. Comparison of (A) MmCheY, (B) TmCheY-FliM16 (PDB ID code 4IGA), and (C) EcCheY-FliM16 (PDB ID code 1F4V). (Upper) Models are shown in cartoon representation. Side chains of FliMN are depicted as sticks and colored according to their elements. (Lower) Surface electrostatic representation shows a prominent negative charge within the N-terminal region of α4 in the archaeal CheY that is absent in the bacterial CheY. Furthermore, the CheY homologs from the F-1 type form rather compact particles and have a shorter α5 helix.