FIG. 1.

(A) The primary structure of the ATPase regulatory protein FliH and schematic representation of mutant FliH proteins produced by MKM11 and SJW1429. FliH is a 235-amino-acid protein that can be roughly divided into three regions: an N-terminal region consisting of the first 100 amino acids, a middle region containing amino acid residues 101 to 140, and a C-terminal region comprising the remainder of the protein. The N-terminal region, middle, and C-terminal regions are essential for interaction with FliJ, for dimerization, and for interaction with FliI, respectively. (B) The primary structure of the flagellum-specific ATPase FliI and schematic representations of the FliI products produced by the plasmids listed in Table 1.