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Bovine liver mitochondria contain about 10% of the total glyoxalase II activity in the homogenate. Electrophoresis and isoelectric focussing of either crude mitochondrial extract or the purified mitochondrial glyoxalase II resolved the enzyme activity into five forms (pl 6.3, 6.7, 7.1, 7.7, and 7.9). Since bovine liver cytosol contains a single form of glyoxalase II (pl 7.5), at least four forms are exclusively mitochondrial with no counterpart in the cytosol. The relative molecular mass of mitochondrial glyoxalase II is about 23-24 kDa, similar to the cytosolic form. The kinetic constants obtained using S-D-lactoyl, S-acetyl-, S-acetoacetyl-, and S-succinyl-glutathione as substrates are similar to those reported for glyoxalase II from rat liver mitochondria. S-D-Lactoyl- and S-acetoacetyl-glutathione are the best substrates. S-Acetylglutathione is the poorest substrate with respect to both Vmax and Km values.
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