Cell envelopes of chemotaxis mutants of Escherichia coli rotate their flagella counterclockwise
نویسندگان
چکیده
منابع مشابه
Cell envelopes of chemotaxis mutants of Escherichia coli rotate their flagella counterclockwise.
Flagella rotated exclusively counterclockwise in Escherichia coli cell envelopes prepared from wild-type cells, whose flagella rotated both clockwise and counterclockwise, from mutants rotating their flagella counterclockwise only, and even from mutants rotating their flagella primarily clockwise. Some factor needed for clockwise flagellar rotation appeared to be missing or defective in the cel...
متن کاملFumarate or a fumarate metabolite restores switching ability to rotating flagella of bacterial envelopes.
Flagella of cytoplasm-free envelopes of Escherichia coli or Salmonella typhimurium can rotate in either the counterclockwise or clockwise direction, but they never switch from one direction of rotation to another. Exogenous fumarate, in the intracellular presence of the chemotaxis protein CheY, restored switching ability to envelopes, with a concomitant increase in clockwise rotation. An increa...
متن کاملCharacterization of Escherichia coli chemotaxis receptor mutants with null phenotypes.
Hydroxylamine mutagenesis was used to alter the tar gene that encodes the transmembrane Tar protein required for chemotaxis. Mutants defective in chemotaxis were selected, and the mutation was characterized by DNA sequencing. Two classes of mutations were found: nonsense and missense. The nonsense mutations were distributed throughout the gene, while the missense mutations were found to cluster...
متن کاملFlagella of Escherichia coli spheroplasts.
Recently, Z. Vaituzis and R. N. Doetsch (J. Bacteriol. 89:1586, 1965) described the relationship between flagellation and motility in penicillin-induced spheroplasts of Salmonella typhimurium, and they concluded that the formation of flagella was dependent upon prior cell wall synthesis. This conclusion has now been confirmed with Escherichia coli (ATCC 13070), the results found being identical...
متن کاملExpression of tolC and organic solvent tolerance of Escherichia coli ciprofloxacin resistant mutants
AcrAB-TolC is a major efflux pump in Escherichia coli. It was reported that tolC is overexpressed and involves in improving the organic solvent tolerance level in Escherichia coli marR mutants that are resistant to several antibiotics, such as ciprofloxacin. Low and intermediate levels resistance did not improve organic solvent tolerance. Thus, in this descriptive-experimental study it was deci...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 1985
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.162.1.451-453.1985