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Beef liver glutamate dehydrogenase: effects of partial proteolysis with chymotrypsin

M J Aitchison, P C Engel

The International Journal of Biochemistry

|January 1, 1983

Abstract:

1. After chymotryptic digestion of bovine glutamate dehydrogenase, the assay conditions determine whether activation or inhibition is observed. 2. The major fragments appear to remain physically associated. 3. Responses to both GTP and ADP are altered. Inhibition by GTP at pH 7 and 8 is almost abolished. 4. Out of various ligand combinations tested, GTP and NADH together provide the best protection against all the proteolytic effects.

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Protein Digestion

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Protein digestion begins in the stomach, where the highly acidic environment can easily disrupt protein structure by exposing the peptide bonds of polypeptide chains. After polypeptide chains are broken into individual amino acids by a series of digestive enzymes, the amino acids are transported to the liver via the bloodstream to produce energy.

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