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Biochemistry. 1975 Jan 28;14(2):197-200.

Immobilized carboxypeptidase A as a probe for studying the thermally induced unfolding of bovine pancreatic ribonuclease.


A method for the preparation of Sephadex-immobilized carboxypeptidase A is presented. This form of the enzyme has the same specific activity as the soluble enzyme at room temperature, but retains its activity at higher temperatures (60-70 degrees). This preparation of immobilized carboxypeptidase A was used, as a proteolytic probe, to investigate the thermally induced unfolding of the C-terminus of ribonuclease A. This technique indicates that the C-terminal residues of ribonuclease A do not unfold until the high-temperature region of the thermal transition (as determined by ultraviolet difference spectrophotometry and optical rotation).

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