Fig. 1.

Schematic representations of spin separations generated by different helix packing and labeling locations. (A) Schematic of the bacterial chemoreceptor is shown with the effector module, studied in this report, depicted in the box. (B) Differences in spin separations on AS2 between the H1 and H1-2 conformations predicted from their crystal structures. Insets display the crystal structures of the C-terminal planes of the two HAMPs viewed from the N-terminal end (AS2 and linker in green). (C) Differences in spin separations within the four-helix bundle of the KCM for an f site and an e site and the hypothetical effect of a clockwise CD1 rotation on these distances. *Spin label.