Abstract
1. 1. The carboxyl-terminal amino acid residue of the β-galactosidase (EC 3.2.1.23) of Escherichia coli K 12 has been shown to be lysine by both hydrazinolysis and carboxypeptidase B (EC 3.4.2.2) digestion. One mole of lysine per mole of monomer was found on the basis of a monomer molecular weight of 135 000. 2. 2. Further evidence is presented suggesting that the monomer may be composed of more than one peptide chain and the suggestion is made that unusual covalent bonds may be present in the molecule.
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