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When human albumin was treated with CNBr, a fragment designated D was obtained and attributed to the absence from some of the albumin molecules of methionine at position 123 [Lapresle &amp; Doyen (1975) Biochem. J. 151, 637-643]. The present study shows that methionine-123 is converted into homoserine without cleavage of the subsequent methionine-cystine bond. With bovine alpha-lactalbumin, a further example of non-cleavage of a methionine-cystine bond with conversion of methionine into homoserine is reported.

Partial non-cleavage by cyanogen bromide of a methionine–cystine bond from human serum albumin and bovine α-lactalbumin