Mechanism of adverse conditions causing lack of flagella in Escherichia coli

Author:

Shi W1,Li C1,Louise C J1,Adler J1

Affiliation:

1. Department of Genetics, College of Agricultural and Life Sciences, University of Wisconsin-Madison 53706.

Abstract

Escherichia coli lacks flagella when grown in tryptone broth in the presence of various adverse conditions (C. Li, C. J. Louise, W. Shi, and J. Adler, J. Bacteriol. 175:2229-2235, 1993). Now, the synthesis, rather than the degradation, of flagellin was shown to be inhibited. Studies of transcriptional fusions of flagellar operons to the lacZ gene revealed that transcription of the flagellar genes was reduced in cells grown under these adverse conditions. Increasing gene dosage of the flhD operon by a plasmid partially suppressed the nonflagellation caused by some adverse conditions. The signal which shuts off the synthesis of flagella under adverse conditions remains to be discovered. This shutting-off process does not result from catabolite repression or from signals from the chemotaxis system.

Publisher

American Society for Microbiology

Subject

Molecular Biology,Microbiology

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