Nucleotide sequence and regulated expression of the Salmonella fljA gene encoding a repressor of the phase 1 flagellin gene

Tadashi Hanafusa, Kenji Saito, Akira Tominaga, Masatoshi Enomoto

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The nucleotide sequence of Salmonella abortus-equi fljA, which together with the phase 2 flagellin gene constitutes the fljBA operon and encodes the repressor for the phase 1 flagellin gene fliC, was determined. The repressor was predicted to be a basic protein consisting of 179 amino acid residues (Mr = 20419 Da) encoded by ORFII. This was confirmed by the fact that host fliC is repressed by plasmid-encoded ORFII, which indeed expresses a 20 kDa product as determined by urea SDS-polyacrylamide gel electrophoresis. An amino acid sequence capable of forming a helix-turn-helix type of structure was predicted in the C-terminal region of FljA. A rho-independent intercistronic terminator was detected between fljB and ftjA. Chloramphenicol acetyltransferase (CAT) assays of fusions indicated that the terminator is capable of reducing expression of fljA to the level of a few percent, relative to fljB in broth cultures and to 1 % in M9 glycerol cultures.

Original languageEnglish
Pages (from-to)260-266
Number of pages7
JournalMGG Molecular & General Genetics
Volume236
Issue number2-3
DOIs
Publication statusPublished - Jan 1 1993

Keywords

  • FljA repressor
  • Intercistronic terminator
  • Salmonella abortus-equi
  • ftjA nucleotide sequence

ASJC Scopus subject areas

  • Genetics

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