Abstract
Three activity peaks of rat liver soluble tyrosine aminotransferase have been resolved using hydroxyl-apatite chromatography. These peaks interconvert during storage of the soluble enzyme preparation in ice for 20 h. A component of a particulate fraction of liver which will interconvert the forms of tyrosine aminotransferase in vitro with no alteration of total enzyme activity has been detected. This factor is present in a 31, 000 gh pellet of liver and is solubilized by sonication. When the factor is subjected to dialysis or incubation at 25°C for 30 min. its effect on tyrosine aminotransferase is greatly diminished.
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