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

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.

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.

scholarly journals Polar and Antipolar Mutants in the Tryptophan Operon of Salmonella typhimurium

1968 ◽  
Vol 95 (6) ◽  
pp. 2217-2229 ◽  
Author(s):  
Elias Balbinder ◽  
Arthur J. Blume ◽  
Anne Weber ◽  
Hideo Tamaki
Keyword(s):  
Salmonella Typhimurium ◽  
Tryptophan Operon
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