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Protein Protocols Protein Protocols

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598 Aitken and Learmonth<br />

Fig. 1. (A) Electrophoretic analysis of the cysteine residues in bovine pancreatic trypsin<br />

inhibitor (1) with six cysteine residues, run with the low-pH system. Lanes 1–5 contain<br />

(respectively) samples reacted with neutral iodoacetamide; 1:1; 1:3; 1:9 ratios of neutral to<br />

acidic reagent; acidic iodoacetate. Lane 6 contains a mixture of equal portions of the<br />

samples in lanes 1–5. (B) Electrophoretic analysis of the cysteine residues in the N-terminal<br />

(lanes a–c) and the C-terminal (lanes d–f) domains of ovotransferrin (6) run with the<br />

high pH system. The subunits contain 13 and 19 cysteines, respectively. Lanes a and d<br />

contain samples alkylated with iodoacetic acid. Lanes b and e contain samples alkylated<br />

with iodoacetamide. Lanes c and e contain mixtures of the samples alkylated with different<br />

ratios of neutral to acidic reagent.

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