Abstract
A N-lambda bacteriophage transducing the structural genes for Escherichia coli K-12 carbamoylphosphate synthase (glutamine) (CPSase; EC 2.7.2.9) has been isolated and analyzed both genetically and physically. The whole int-N region is substituted for a short chromosomal segment corresponding almost exactly to the car locus. The study of CPSase, ornithine carbamoyltransferase, and aspartate carbamoyltransferase regulation in carriers of lambdadcar confirms the previously reported participation of the argR gene product in the control of CPSase synthesis and points to the existence of a regulatory molecule involved in the control of both CPSase and aspartate carbamoyltransferase synthesis. The general usefulness of using N- lambda transducing bacteriophages for the recovery of large amounts of gene products is discussed.
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