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. 1985 Sep;163(3):1047–1054. doi: 10.1128/jb.163.3.1047-1054.1985

Isolation and composition of sheathed flagella from Bdellovibrio bacteriovorus 109J.

L S Thomashow, S C Rittenberg
PMCID: PMC219236  PMID: 4030691

Abstract

A procedure was developed for the purification of sheathed flagella from Bdellovibrio bacteriovorus 109J. Preparations of isolated flagella appeared as filaments 28 nm in diameter, did not vary in sheath content by more than 10% from the mean, and contained 50% protein, 38% phospholipid, and 12% lipopolysaccharide (LPS) by weight. The sheath was readily solubilized by Triton X-100, whether or not EDTA was present, and contained all of the LPS and phospholipid and 30 to 40% of the protein of the intact flagella; sedimentable core filament polypeptides accounted for the remainder. Flagellar LPS was significantly enriched in nonadecenoic acid (19:1) and depleted in beta-hydroxymyristic acid relative to outer membrane LPS from intraperiplasmically grown bdellovibrios. These observations suggest that the sheath is a stable domain distinct from the bulk of the outer membrane. The sheath also contained substantially more phospholipid (57%) and less protein (26%) of a more heterogeneous composition than that of previously described outer membranes. This unusual balance of constituents was predicted to result in a fluid membrane compatible with a model for the generation of motility by rotation of the core filament within a highly flexible sheath.

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