Structure and composition of soluble feather keratin

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Abstract
The reaction of soluble feather keratin with 1-fluoro-2:4-dinitrobenzene and with phenyl isothiocyanate indicates that the protein contains only one-tenth equivalent of N-terminal amino acids/ mole of protein. The reaction of soluble feather keratin with carboxy-peptidase and with the OH" ion can be interpreted as evidence for the absence of a molar proportion of a-carboxyl groups. Some of the amino acids in soluble feather keratin were estimated quantitatively. It is concluded that the feather keratin monomer is an unbranched cyclic peptide.
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