Subunit arrangements in bacterial flagella

Three Mutations in Escherichia coli That Generate Transformable Functional Flagella

“…Many amino acid exchanges that alter the morphology of stationary filaments have been identified in Salmonella and E. coli (13,21,24). These mutants are generally nonmotile, yet provide a useful tool for elucidating flagellum structure (16,24,38,45). The flagella of strain LMG194, an E. coli K-12 derivative, appeared as straight filaments at neutral pH after fluorescence staining, but the cells remain chemotactic (32).…”