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- W1934487304 abstract "Taylor , M. W. (Stanford University, Stanford, Calif.), and C. Yanofsky . Chromosomal relocation of prophage-associated bacterial genes. J. Bacteriol. 91: 1469–1476. 1966.—Two distinguishable colony types, rough-edged and smooth-edged, were observed when tryptophan auxotrophs of Escherichia coli were transformed to tryptophan independence with DNA from the hybrid nondefective transducing phage i λ h φ80 T 1 S tryp A + B + , and with the helper phage λi 434 . P1kc transduction experiments with cells of the two types of colonies as genetic donors showed that the i λ h φ80 T 1 S tryp A + B + prophage was located at different regions of the E. coli chromosome. In cells of rough-edged colonies, the prophage was linked to the tryp-cys region, its normal location, whereas in cells of smooth-edged colonies the prophage was associated with the gal region. When transformation experiments were performed with a T 1 R tryp − deletion mutant as recipient, and phage λi 434 as helper, prophage localization was only detected at the gal region. Localization of λ h φ80 T 1 S tryp A + B + prophage near gal does not appear to be due to the formation of a recombinant phage carrying tryp A + B + , but is due to some type of interaction between the genomes of i λ h φ80 T 1 S tryp A + B + and the helper phage. When conditions comparable to those used in transformation studies were employed in transduction experiments, including the use of helper phage, two classes of transductants with either cys or gal linkage were also observed. To examine whether the location of the prophage on the E. coli chromosome had any effect on the ability of the prophage-associated tryp A + and tryp B + genes to function or respond to different repression conditions, specific activities of the A and B subunits of tryptophan synthetase specified by the phage genome were measured. Similar values were obtained regardless of the location of the prophage-associated tryp genes. Furthermore, the prophage-associated tryp genes, free from their normal operator region, permitted enzyme formation which was unaffected by repression or derepression conditions." @default.
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- W1934487304 date "1966-04-01" @default.
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- W1934487304 title "Chromosomal Relocation of Prophage-Associated Bacterial Genes" @default.
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- W1934487304 doi "https://doi.org/10.1128/jb.91.4.1469-1476.1966" @default.
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