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Singlet-singlet energy transfer from the tryptophan residues to an active-site-serine-bound 5-dimethylaminonaphthalene-1-sulphonyl group was investigated in four subtilisins. The transfer distances for subtilisin Novo and mesentericopeptidase are 1.93 +/- 0.20 nm (19.3 +/- 2.0 A) and 1.81 +/- 0.20 nm (18.1 +/- 2.0 A) respectively. The positions of the indole groups in the three-dimensional structures of the two pairs of proteinases, namely subtilisin Novo and mesentericopeptidase on the one hand and subtilisins Carlsberg and DY on the other, are essentially identical.

biochemical journal

Intramolecular distances between tryptophan residues and the active-site serine residue in alkaline bacterial proteinases as measured by fluorescence energy-transfer studies