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 sequence of the amino terminal 28 residues of the tryptophan synthetase α chain of
Serratia marcescens
is presented and compared with the related sęquences of α chains of other bacteria.
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