Abstract
The microvillus fraction isolated from rabbit renal cortex contained about 5% of the total carbonic anhydrase activity in the homogenate, which could not be explained by contamination with the cytoplasm or erythrocyte soluble fractions. The carbonic anhydrase of the microvillus fraction showed two K1 values for each of the three sulfonamide inhibitors tested (sulfanilamide, acetazolamide, and ethoxzolamide). The values were essentially the same as those shown by the cytoplasm and erythrocyte soluble fractions, though the activity ratio of low to high K1 isozymes of the microvillus fraction seemed to be different from those of the other two fractions.
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