Bovine alpha-lactalbumin has been dansylated to give an enzymatically fully active, highly fluorescent derivative. This derivative is uniquely labeled on the N-terminal glutamic acid residue of alpha-lactalbumin. This fluorescent derivative of alpha-lactalbumin has been covalently cross-linked to galacto-syltransferase by using dimethyl pimelimidate. Resonance energy transfer measurements using cobalt bound to the transferase as the acceptor of energy transfer from the dansyl group on the alpha-lactalbumin indicate that the dansyl group is 32 A from the cobalt of the transferase. A model of the active site of the transferase and its interaction with alpha-lactalbumin is proposed on the basis of these and previous studies.
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O'Keeffe et al. (1980) studied this question.
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