Gene fliA encodes an alternative sigma factor specific for flagellar operons in Salmonella typhimurium

Kouhei Ohnishi, Kazuhiro Kutsukake, Hideho Suzuki, Tetsuo Iino

Research output: Contribution to journalArticle

169 Citations (Scopus)

Abstract

Through genetic studies, the fliA gene product has been shown to regulate positively gene expression in late operons of the flagellar regulon in Salmonella typhimurium. In the present study, the fliA gene was cloned and sequenced. The fliA coding region consisted of 717 nucleotides beginning with the GTG initiation codon and the conserved sequence specific to promoters for flagellar operons was found to exist upstream of the coding region. The fliA gene product deduced from the nucleotide sequence was a protein with 239 amino acid residues and the calculated molecular mass was 27470 dalton. The deduced amino acid sequence was homologous with that of σ28, a flagellar specific sigma factor of Bacillus subtilis. The fliA gene product was identified as a protein of molecular mass 29 kDa in the in vitro transcription-translation system, while three proteins of 29 kDa, 31 kDa and 32 kDa were found in the products programmed by the fliA gene in minicells and in maxicells. The 29 kDa FHA protein was purified from the FliA overproducing strain which carried the p tac-fliA fusion. This protein activated the in vitro synthesis of flagellin, the fliC gene product. RNA polymerase containing the purified FliA protein was shown to transcribe the fliC gene. These results indicate that FliA protein functions as an alternative sigma factor specific for S. typhimurium flagellar operons.

Original languageEnglish
Pages (from-to)139-147
Number of pages9
JournalMGG Molecular & General Genetics
Volume221
Issue number2
DOIs
Publication statusPublished - Apr 1990
Externally publishedYes

Fingerprint

Sigma Factor
Salmonella typhimurium
Operon
Genes
Proteins
Flagellin
Amino Acid Sequence Homology
Regulon
Initiator Codon
Conserved Sequence
DNA-Directed RNA Polymerases
Bacillus subtilis
Nucleotides
Gene Expression
Amino Acids

Keywords

  • DNA sequence
  • Flagellar regulon
  • FliA purification
  • Sigma factor
  • Transcriptional activator

ASJC Scopus subject areas

  • Genetics

Cite this

Gene fliA encodes an alternative sigma factor specific for flagellar operons in Salmonella typhimurium. / Ohnishi, Kouhei; Kutsukake, Kazuhiro; Suzuki, Hideho; Iino, Tetsuo.

In: MGG Molecular & General Genetics, Vol. 221, No. 2, 04.1990, p. 139-147.

Research output: Contribution to journalArticle

Ohnishi, Kouhei ; Kutsukake, Kazuhiro ; Suzuki, Hideho ; Iino, Tetsuo. / Gene fliA encodes an alternative sigma factor specific for flagellar operons in Salmonella typhimurium. In: MGG Molecular & General Genetics. 1990 ; Vol. 221, No. 2. pp. 139-147.
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