Summary: An unusual K12 mutant for carbamyl phosphate synthetase is described. The mutation was generated by bacteriophage MuI insertion and left a 5% residual activity of the enzyme using either ammonia or glutamine as donors. The mutation is recessive to the wild-type allele and maps at or near the gene, but the mutant requires only arginine and not uracil for growth. By a second block in the gene it was possible to shift the accumulated carbamyl phosphate to arginine biosynthesis. The values and the levels of ornithine activation and inhibition by UMP were normal in the mutant enzyme.


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