Abstract
The intact flagella of Wolinella succinogenes, a gram-negative, anaerobic bacterium with a single polar flagellum, were obtained by an improved procedure, introduced recently by Aizawa et al. (S.-J. Aizawa, G. E. Dean, C. J. Jones, R. M. Macnab, and S. Yamaguchi, J. Bacteriol. 161:836-849, 1985) for the flagellum of Salmonella typhimurium. Disks with a diameter of 130 +/- 30 nm, which were attached to the basal body of the isolated intact flagella, could be identified by electron microscopy as additional structural elements of the bacterial flagellar apparatus. In freeze-dried and metal-shadowed samples, two rings of the basal body were detected on one side and a terminal knob was located on the other side of the disks. Suspension of the flagellar apparatus in acidic solution dissociated the flagellar filaments, yielding hook-basal body complexes with and without the associated disks. If whole cells were subjected to low pH, double disks of the same diameter and with a central hole of about 13 nm could be isolated. Similar parallel disks could be seen also in negatively stained whole cells. When uranyl acetate was used for negative staining of the intact flagella, concentric rings were detected on the disks, similar to the concentric membrane rings found by Coulton and Murray (J. W. Coulton and R. G. E. Murray, J. Bacteriol. 136:1037-1049, 1978) on platelike arrays of proteins in outer membrane preparations of Aquaspirillum serpens. Because the disks of W. succinogenes can be isolated together with the flagellar hook-basal body complex, they appear to be basal-body-rather than secondary membrane-associated structures. It is possible that these disks are the bearing or stator of this rotary device.
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