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1. A diagonal electrophoretic technique for studying the amino acid sequence around cysteine and cystine residues in proteins is described. The residues are first converted into S-aminoethylcysteine, and the protein is then treated with S-ethyl trifluorothioacetate, which trifluoroacetylates all the protein amino groups. The modified protein is digested enzymically and the resulting peptides are separated by paper electrophoresis. After exposure of the peptides on the paper to ammonia vapour, the electrophoresis is repeated, this time at right angles to the original direction. Peptides from which a trifluoroacetyl group is removed by the ammonia treatment will vacate the 45 degrees diagonal formed by all other unaffected peptides owing to the exposure of an additional amino group and consequent increased electrophoretic mobility towards the cathode. Peptides containing lysine or S-aminoethylcysteine are readily purified by this technique. 2. The successful application of the technique to bovine insulin is described. 3. Various methods for distinguishing peptides containing lysine from those containing S-aminoethylcysteine in more complicated proteins are suggested and discussed.

A diagonal paper-electrophoretic technique for studying amino acid sequences around the cysteine and cystine residues of proteins