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. 1985 Apr;162(1):183–189. doi: 10.1128/jb.162.1.183-189.1985

Locations of hook-associated proteins in flagellar structures of Salmonella typhimurium.

M Homma, T Iino
PMCID: PMC218972  PMID: 3884587

Abstract

Hooks of the flagella of Salmonella typhimurium were purified from an flaL mutant. Hook-associated proteins, namely HAP1, HAP2, and HAP3, were separated from them, and the antibody against each HAP was prepared. By immunoelectron microscopic observation, these three kinds of antiHAP antibodies were found to bind on the distal ends of hooks of filamentless mutants consistently with their composition of HAPs. The antiHAP2 antibody bound to the very tops of the claw-shaped ends of the hooks which contain all three HAPS. The antibodies against HAP1 and HAP3 bound to the basal areas and the middle areas, respectively, of the claw-shaped ends. The order of disassembly of the component proteins by heat treatment of the hook structure from the filamentless mutants was (HAP2, HAP3) greater than HAP1 greater than hook protein. These observations were consistent with our layered structure model: HAP1, HAP3, and HAP2 are assembled at the distal end of the hook in this sequence. All three HAPs were detected in the hook-filament complexes prepared from a flagellate strain. When the hook-filament structure was treated with antibody against HAP1 and with the anti-rabbit immunoglobulin G antibody, the antibody aggregate was observed in the region corresponding to the boundary between filament and hook. This observation strongly suggests that HAP1 is the protein connecting filament with hook. The locations of HAP2 and HAP3 in the hook-filament structure were not clarified with the same procedure.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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