Abstract
Summary
Glutamic-aspartic transaminase is inactivated by sunlight and by ultraviolet light. Destruction of enzymatic activity by these agents parallels the destruction of vitamin B6, a derivative of which is present as the prosthetic group of the enzyme. 1 2 3 4 The irradiated enzyme is not reactivated by addition of pyridoxine, pyridoxal, pyridox-amine or boiled tissue extracts. Irradiation with X-rays leaves the enzyme intact.
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