Metabolic and Kinetic Study of D-Aspartate-Containing Protein Caused by Oxidative Stress

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The formation and accumulation of D-aspartate residue (D-Asp) in proteins caused by oxidative stress leads to denaturation of proteins, and is consequently responsible for aging-related misfolding diseases such as Alzheimer's disease. We sought to identify that an unknown protease selectively degrades the D-Asp-containing protein, namely D-aspartyl endopeptidase (DAEP), and finally purified it. DAEP therefore seems to physiologically serve as the quality control system against the noxious D-Asp-containing protein in the long life span of mammals.