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Published on: February 24, 2018
Heterogeneity of human liver alanine aminotransferase due to sulfhydryl groups oxidation
G Gubern1, S Imperial, M Busquets
1Departament de Bioquimica i Fisiologia, Facultat de Química, Universitat de Barcelona, Spain.
Abstract:
The cytosolic isoenzyme of human liver alanine aminotransferase exhibited a progressive change in its chromatographic behavior on DEAE-Sepharose when partially purified preparations were stored for up to 8 days at 4 degrees C. This change was characterized by the appearance of an additional chromatographic variant and was avoided by addition of 2-mercaptoethanol. The experimental evidence presented indicates that the progressive oxidation of free sulfhydryl groups of the enzyme is responsible for the charge modifications and heterogeneity observed.
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