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These studies establish the specificity of 3,3,3-trifluorobromoacetone for reaction with the active site cysteines of rabbit muscle glyceraldehyde-3-phosphate dehydrogenase and suggest the potential use of trifluoroacetonyl groups as 19F nuclear magnetic resonance probes for study of symmetry relations between the four protomers of the enzyme. The alkylation of the holoenzyme follows biphasic kinetics and indicates either preexistent or induced nonequivalence among the sites; these effects are not predisposed by a low coenzyme/enzyme ratio. Two additional alkylation sites not at the active centers are created by acylation with beta-(2-furyl)acryloyl phosphate: it is concluded that pseudosubstrates cause an intramolecular rearrangement which exposes two sulfhydryl functions besides those of the active site (Cys-149).
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