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Biological Activity of Phosphate Esters in Mammary Gland Extracts^{1, 2,}

Laboratory of Biochemistry, Department of Dairy Science, University of Illinois, Urbana

ABSTRACT

Glucose-6-phosphate, fructose-6-phosphate, and -glucose-1-phosphate were phosphorylated by mammary gland homogenates. During the phosphorylation of -glucose-1-phosphate fructose was formed. These findings present evidence for the presence of the enzymes phosphoglucomutase, phosphohexoisomerase, and phosphohexokinase in the tissue of lactating rat mammary glands. These enzymes are specific for glucose esters and have no activity with galactose esters.

Other enzymes are present which induce transphosphorylation in the presence of -galactose-1-phosphate, ß-galactose-1-phosphate, and galactose-6-phosphate. These esters were not converted to glycolytic intermediates or to ketose esters under the conditions studied.

¹ Preliminary report: Federation Proc., 12: 192. 1953.

² Supported in part by a grant from the United States Atomic Energy Commission, Contract No. AT (11-1)-67, Project No. 10.