The structure of the galactokinase in Escherichia coli has been analyzed with the aim of defining the size of its structural gene. To that end the molecular weight, amino acid composition, number of tryptic peptides, and amino-terminal residues of this protein were determined. The results indicate that this galactokinase consists of one polypeptide chain containing 368 residues, and hence that its structural gene contains about 1100 base pairs.
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Wilson et al. (1969) studied this question.
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