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Reactivities of the various protonic states in the reactions of papain and of L-cysteine with 2,2''- and with 4,4''- dipyridyl disulphide: evidence for nucleophilic reactivity in the un-ionized thiol group of the cysteine-25 residue of papain occasioned by its interaction with the histidine-159-asparagine-175 hydrogen-bonded system. |
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| Authors: | K Brocklehurst and G Little |
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