Evidence for two sites for initiation of gene expression in the tryptophan operon of Salmonella typhimurium

1967 ◽  
Vol 26 (3) ◽  
pp. 423-436 ◽  
Author(s):  
Ronald H. Bauerle ◽  
Paul Margolin
Keyword(s):  
Gene Expression ◽  
Salmonella Typhimurium ◽  
Tryptophan Operon

scholarly journals Evidence that HT mutant strains of bacteriophage P22 retain an altered form of substrate specificity in the formation of transducing particles in Salmonella typhimurium

1976 ◽  
Vol 27 (2) ◽  
pp. 315-322 ◽  
Author(s):  
Cesar A. Chelala ◽  
Paul Margolin
Keyword(s):  
Substrate Specificity ◽  
Salmonella Typhimurium ◽  
Host Cell ◽  
Bacteriophage P22 ◽  
Phage Dna ◽  
Mutant Phage ◽  
Mutant Strains ◽  
Phage Strain ◽  
Tryptophan Operon ◽  
Altered Form

SUMMARYThe effects of two different deletions of the tryptophan operon on the cotransduction linkage of the nearby cysB and pyrF markers were studied using three sets of donor lysates, each produced by a different HT mutant P22 phage strain. Each trp operon deletion (present in both donor and recipient to preserve homology) caused changes in the cotransduction frequencies. This indicated that the HT mutant phage encapsulating mechanism, whose ability to discriminate phage DNA from host-cell DNA is absent or diminished, could still distinguish among nucleotide sequences in selecting bacterial chromosome sites at which to initiate transducing particle formation. The three HT mutant phage strains each produced different sets of cotransduction linkage values, indicating that this aspect of substrate specificity was altered differently and uniquely by each HT mutation.

scholarly journals The architecture and ppGpp-dependent expression of the primary transcriptome of Salmonella Typhimurium during invasion gene expression

BMC Genomics ◽  
2012 ◽  
Vol 13 (1) ◽  
pp. 25 ◽  
Author(s):  
Vinoy K Ramachandran ◽  
Neil Shearer ◽  
Jobin J Jacob ◽  
Cynthia M Sharma ◽  
Arthur Thompson
Keyword(s):  
Gene Expression ◽  
Salmonella Typhimurium

scholarly journals Cinnamaldehyde, Carvacrol and Organic Acids Affect Gene Expression of Selected Oxidative Stress and Inflammation Markers in IPEC‐J2 Cells Exposed to Salmonella typhimurium

2016 ◽  
Vol 30 (12) ◽  
pp. 1988-2000 ◽  
Author(s):  
Sara A. Burt ◽  
Simone J.M. Adolfse ◽  
Dina S.A. Ahad ◽  
Monique H.G. Tersteeg‐Zijderveld ◽  
Betty G.M. Jongerius‐Gortemaker ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Gene Expression ◽  
Organic Acids ◽  
Salmonella Typhimurium ◽  
Inflammation Markers ◽  
Affect Gene Expression

scholarly journals Episomic suppression of phenotype in Salmonella

1964 ◽  
Vol 5 (2) ◽  
pp. 269-281 ◽  
Author(s):  
P. F. Smith-Keary ◽  
G. W. P. Dawson
Keyword(s):  
Gene Expression ◽  
Salmonella Typhimurium ◽  
Uv Irradiation ◽  
Complementation Group ◽  
Wild Type ◽  
Complementation Groups

1. An auxotroph of Salmonella typhimurium, pro-401, was isolated in a strain that was unstable at the su-leuA locus. The auxotrophy of pro-401 is probably due to the attachment of a controlling episome to the proline region of the genome where it suppresses gene expression.2. The controlling episome frequently transposes over short distances so that all clones consist of cells, mixed for the site at which the controlling episome is attached; homologous transductions yield prototrophs.3. The controlling episome can transpose to a different complementation group; homologous transductions yield abortive transductants; syntrophism occurs between cells that are ‘mutant’ in different complementation groups to give reversions consisting entirely of auxotrophic cells which are called auxotrophic reversions.4. The controlling episome transposes over very short distances and never to beyond the limits of this proline region of the genome; no wild-type reversions were found.5. The controlling episome can be located at relatively distant proline sites in different clones; prototrophs from transductions between clones that are separated by many subculturings can be 100 times more frequent than from homologous transductions.6. The controlling episome has its frequency of transposition to different complementation groups increased by UV; irradiation increases the frequency of auxotrophic reversions.7. The controlling episome continues to transpose in stored cells.8. The pattern of reversions of pro-401 is different in these studies from its pattern two years previously. This is discussed.

TRYPTOPHAN-REQUIRING PARENTAL STRAINS YIELDSALMONELLA TYPHIMURIUM×ESCHERICHIA COLIHYBRID RECOMBINANTS WITH FUNCTIONAL TRYPTOPHAN OPERONS

1979 ◽  
Vol 21 (2) ◽  
pp. 255-259
Author(s):  
Dennis W. Stetter ◽  
Richard B. Middleton
Keyword(s):  
Escherichia Coli ◽  
Salmonella Typhimurium ◽  
Parental Species ◽  
Tryptophan Operon

Crosses between an Escherichia coli Hfr trp strain and three Salmonella typhimurium F−trp strains produced some trp+hybrids in which the tryptophan operon is composed of genes from both parental species.

Operator and promoter are separate in the tryptophan operon in Salmonella typhimurium

Nature ◽  
1974 ◽  
Vol 251 (5471) ◽  
pp. 119-123 ◽  
Author(s):  
Hiroyuki Aono ◽  
Frank Angelosanto ◽  
Elias Balbinder
Keyword(s):  
Salmonella Typhimurium ◽  
Tryptophan Operon
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