Amino-terminal sequences are presented for polypeptide components I and I1 of the anthranilate synthetase of Escherichia coli, Salmonella typhimurium, and Serratia marcescens. The respective amino-terminal sequences are homologous in all three species despite the fact that component I1 of E . coli and S . typhirnurium is three times as large as
The partial sequences of the first 40 residues of indoleglycerol phosphate synthetase of Escherichia coli and Salmonella typhimurium were determined, and three amino acid differences were observed among the 38 residues compared.
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