Abstract
1. 1. The quenching of tryptophan fluorescence by the copper-oxygen complex in oxyhaemocyanin has been investigated by following the fluorescence as the concentration of quencher was decreased in the presence of cyanide or acid. The relative yield of fluorescence has been expressed as a function of quencher concentration. 2. 2. Estimation of the exposure of tryptophan residues at acid pH and of the destruction of these residues with N-bromosuccinimide in relation to the loss of the copper-oxygen complex indicated that each oxygen-binding site is related to eight equivalent tryptophan residues, the number found per two-copper unit.
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