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Particularly stable elements of noncovalent structure in bovine carbonic anhydrase have been detected and studied. These are present in a highly populated intermediate state formed during denaturation of the enzyme with guanidinium chloride. The intermediate has been detected by analysis of the denaturation profiles, and some of its structural properties have been characterized by CD and fluorescence spectroscopy, including fluorescence polarization and lifetime measurements. Measurements have been made on the Zn2+-enzyme, Co2+-enzyme, and apoenzyme to ascertain the structural effects of the active-site Zn2+. Kinetic measurements indicate that this intermediate is on the folding pathway from the random coil to the native state.
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Henkens et al. (1982) studied this question.
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