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Ellis S. Kempner; James W. Whittaker; Jay H. Miller(Profiled Author: James Whittaker)
Protein Science. 2010;19(2):236-241.Abstract
To determine the radiation sensitivity of galactose oxidase, a 68 kDa monomeric enzyme containing a mononuclear copper ion coordinated with an unusually stable cysteinyl-tyrosine (Cys-Tyr) protein free radical. Both active enzyme and reversibly rendered inactive enzyme were irradiated in the frozen state with high-energy electrons. Surviving polypeptides and surviving enzyme activity were analyzed by radiation target theory giving the radiation sensitive mass for each property. In both active and inactive forms, protein monomer integrity was lost with a single radiation interaction anywhere in the polypeptide, but enzymatic activity was more resistant, yielding target sizes considerably smaller than that of the monomer. These results suggest that the structure of galactose oxidase must make its catalytic activity unusually robust, permitting the enzymatic properties to survive in molecules following cleavage of the polymer chain. Radiation target size for loss of monomers yielded the mass of monomers indicating a polypeptide chain cleavage after a radiation interaction anywhere in the monomer. Loss of enzymatic activity yielded a much smaller mass indicating a robust structure in which catalytic activity could be expressed in cleaved polypeptides. © 2009 The Protein Society.
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