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Ranganathan S, Tew KD
Analysis of Glyoxalase-I from Normal and Tumor-Tissue from Human Colon
Biochimica Et Biophysica Acta (1993) 1182:311-316.
Glyoxalase-I (Gly-I) is part of the glyoxalase system which converts methylglyoxal to D-lactic acid via an S-D- lactoylglutathione intermediate. This glutathione (GSH)-binding protein was purified from human colon tumors and corresponding normal tissue. The GSH-affinity purified fraction from normal human colon tissue showed enzyme activity of 30.6 +/- 11.5 mumol/min per mg protein, with methylglyoxal as substrate. Corresponding fractions from carcinomas showed significantly elevated Gly-I activity of 54.5 +/- 15 mumol/min per mg protein. Polyclonal antibodies made against human Gly-I cross- reacted weakly with mouse liver Gly-I but not with yeast Gly-I. Isoelectric points of Gly-I from human, mouse and yeast were determined to be 4.6, 4.9 and 7.0, respectively, by horizontal IEF. Immunohistochemical analysis confirmed the increase of Gly-I in human colon carcinoma in 16 out of 21 samples when compared to corresponding normal tissue. The elevated levels of Gly-I in colon tumors may be an indicator of the enhanced proliferative status of the neoplastic condition.
Publication Date: 1993-10-20.
Last updated on Wednesday, July 08, 2020