Molecular organization of genes constituting the virulence determinant on the Salmonella typhimurium 96 kilobase pair plasmid.
The ability of intracellular growth is plasmid-dependent in Salmonella typhimurium. Only a small portion of this 96 kilobase pair plasmid appears essential for intracellular growth. The genetic organization of this region (the essential virulence determinant) was resolved. Fragments of the virulence determinant were cloned from the 96-kb plasmid pEX102 and transformed into minicell-producing E. coli. Plasmid-directed protein synthesis was investigated in metabolically labeled minicells. This analysis indicated the presence of at least four genes, mkaA, mkaB, mkaC and mkaD, within the virulence determinant encoding proteins of 70, 31, 30 and 29 kDa, respectively. The genes were positioned on the restriction map of the 96-kb virulence plasmid and the map locations confirmed by nucleotide sequence analysis of two new virulence genes (mkaB and mkaC).
Taira
S
S
Molecular Biology Unit, National Public Health Institute, Helsinki, Finland.
Rhen
M
M
D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D002874:Chromosome Mapping; D004252:DNA Mutational Analysis; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010957:Plasmids; D015183:Restriction Mapping; D012486:Salmonella typhimurium / Q000235:genetics* / Q000472:pathogenicity; D014157:Transcription Factors; D014158:Transcription, Genetic
D001426:Bacterial Proteins; D014157:Transcription Factors; C061929:mkaB protein, Salmonella typhimurium; C061928:mkaC protein, Salmonella typhimurium