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. 1970 Jan;101(1):250–261. doi: 10.1128/jb.101.1.250-261.1970

Differentiation Within the Bacterial Flagellum and Isolation of the Proximal Hook

Dinah Abram 1,2,1, J R Mitchen 1,2, Henry Koffler 1,2, A E Vatter 1,2
PMCID: PMC250476  PMID: 4189228

Abstract

Purified and crude flagellar isolates from cells of Bacillus pumilus NRS 236 were treated with acid, alcohol, acid-alcohol, or heat, and were examined electron microscopically in negatively stained and shadow-cast preparations. Under certain conditions, each of these agents causes the flagella to break between the proximal hooks and the spiral filaments. In such preparations, filaments are seen in various stages of disintegration, whereas hooks of fairly constant length retain their integrity and morphological identity. When crude isolates of flagella are treated under these conditions, the hooks remain attached to membrane fragments or bear basal material. These findings substantiate previous structural observations that led to the view that the proximal hook is a distinct part of the bacterial flagellum and further confirm that the hook is tightly associated with basal material and the cytoplasmic membrane. It appears that the hook is a polarly oriented structure, and that the interactions between the hook and the basal material or the cytoplasmic membrane are different from those between the hook and the filamentous portion of the organelle. Moreover, both types of interaction apparently differ still from those by which the flagellin subunits are held together in the flagellar filament. Hooks were isolated by exploiting the differences in relative stability shown by the various morphological regions of the bacterial flagellum.

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