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J Bacteriol. 1992 October; 174(19): 6198-6206

research-article

A three-start helical sheath on the flagellar filament of Caulobacter crescentus.

Department of Membrane and Ultrastructure Research, Hebrew University-Hadassah Medical School, Jerusalem, Israel.

ABSTRACT

An unusual feature in preparations of the Caulobacter crescentus flagellar filaments is that some filaments are surrounded by a set of three windings that form a sheath. We provide evidence that the sheath is composed of subunits having a molecular mass of 24,000 Da. We suggest that the sheath could be composed of protofilaments of flagellin wound around the filament.

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