Abstract
The translated sequence of aroF, the first structural gene of the tyrosine operon of Escherichia coli, has been determined. The 1068 nucleotides encode the 356 amino acids that form the subunit of the dimeric tyrosine-sensitive 3-deoxy-D-arabino-heptulosonate 7-phosphate synthase. The primary structure of this enzyme has been confirmed by automated Edman degradation of peptide fragments produced by cleavage with cyanogen bromide, limited trypsin digestion, Staphylococcus aureus strain V8 protease, or mild acid hydrolysis. The amino acid sequence of this enzyme is compared with the sequence of the phenylalanine-sensitive 3-deoxy-D-arabino-heptulosonate 7-phosphate synthase, deduced from the aroG DNA sequence (Davies, W. D., and Davidson, B. E. (1982) Nucleic Acids Res. 10, 4045-4058).
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