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Journal of Bacteriology, October 1998, p. 5010-5019, Vol. 180, No. 19
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
A New Class of Caulobacter crescentus
Flagellar Genes
Guy
Leclerc,*
Shui
Ping
Wang,
and
Bert
Ely
Department of Biological Sciences, University
of South Carolina, Columbia, South Carolina 29208
Received 27 March 1998/Accepted 24 July 1998
Eight Caulobacter crescentus flagellar genes,
flmA, flmB, flmC, flmD,
flmE, flmF, flmG, and
flmH, have been cloned and characterized. These eight genes
are clustered in pairs (flmAB, flmCD,
flmEF, and flmGH) that appear to be
structurally organized as operons. Homology comparisons suggest that
the proteins encoded by the flm genes may be involved in
posttranslational modification of flagellins or proteins that interact
with flagellin monomers prior to their assembly into a flagellar
filament. Expression of the flmAB, flmEF, and
flmGH operons was shown to occur primarily in predivisional
cells. In contrast, the flmCD operon was expressed throughout the cell cycle, with only a twofold increase in
predivisional cells. The expression of the three temporally regulated
operons was subject to positive regulation by the CtrA response
regulator protein. Mutations in class II and III flagellar genes had no significant effect on the expression of the flm genes.
Furthermore, the flm genes did not affect the expression of
class II or class III flagellar genes. However, mutations in the
flm genes did result in reduced synthesis of the class IV
flagellin proteins. Taken together, these data indicate that the
flm operons belong to a new class of flagellar genes.
*
Corresponding author. Mailing address: Department of
Biological Sciences, University of South Carolina, 700 Sumter St.,
Columbia, SC 29208. Phone: (803) 777-7105. Fax: (803) 777-4002. E-mail: gleclerc{at}biol.sc.edu.

Present address: Department of Internal Medicine, Washington
University School of Medicine, St. Louis, MO 63110.
Journal of Bacteriology, October 1998, p. 5010-5019, Vol. 180, No. 19
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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