Abstract

Glyceraldehyde-3-phosphate-dehydrogenase (GAPDH) was extracted from Pteronarcys californica (Plecoptera) by ammonium sulphate fractionation. The enzyme was treated with three forms of mercury (mercuric chloride, methylmercuric chloride, and phenylmercuric chloride) and their in vitro and in vivo effects on GAPDH were studied. It was found that the orders of toxicity were reversed in the in vivo-in vitro experiments. Electrophoresis was conducted on both treated and untreated enzyme, and showed no differences in mobilities between the two. The enzyme was not found to be inhibited by 0·1 mM iodoacetic acid and required cysteine for activity.

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