Abstract
A lambda lysogen with the prophage inserted into the arabinose B gene of Escherichia coli strain K-12 has been prepared. Induction of the phage from this lysogen yields viable phage at a frequency 4 X 10(-6) that found for induction of lysogens with phage inserted at the normal attachment site. Over 30% of the phage particles induced from the insertion in ara are arabinose-transducing phage. The excision end points of 62 independently isolated, nondefective araC-transducing phage containing less than the entire araC gene were genetically determined and were found to be randomly distributed through the araC gene. The amount of arabinose deoxyribonucleic acid contained on four selected transducing phage was determined by electron microscopy of deoxyribonucleic acid heteroduplexes, providing a physical map of the araC gene. The efficiency with which these phage transduce araC and araB point mutations was found to be approximately proportional to the homology length available for recombination.
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Selected References
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