OXIDATION OF METHIONINE RESIDUES IN BOVINE GROWTH HORMONE BY CHLORAMINE-T

Abstract
The methionine residues in bovine growth hormone were chemically modified with chloramine-T at pH 7.4 using different chloramine-T methionine molar ratios. Methionine 4 was the most reactive followed in decreasing order by methionines 148, 123 and 178. With a 50-fold molar excess of chloramine-T over methionine almost full oxidation of all the methionine residues was achieved. The oxidation of the 4 residues of methionine does not change the growth promoting activity of the hormone in hypophysectomized rats.

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