Abstract
As a result of previous work1–3, it has been concluded that there exist in α-casein, arginine and lysine residues carrying free α-amino groups and occupying N-terminal positions in open polypeptide chains. Estimates of the amounts of such arginine and lysine have however varied within wide limits. Furthermore, the α-casein employed in two at least of these investigations1,2 was prepared using a fractionation procedure now known to yield α-casein contaminated with k-casein.
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MANSON, W. The N-Terminal Amino-acids of α-Casein. Nature 184, 1393–1394 (1959). https://doi.org/10.1038/1841393a0
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DOI: https://doi.org/10.1038/1841393a0
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