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Phosphokinase Activity of the Mammary Gland^{1, 2, 3,}

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

ABSTRACT

Mammary gland tissue homogenates phosphorylated glucose, fructose, mannose, and maltose. Glucokinase activity was stimulated by the presence of added magnesium ion. Glucose and mannose were phosphorylated at a maximum rate at lower substrate concentrations than fructose and maltose. Phosphorylation of lactose and galactose did not occur at a significant rate. The evidence indicated that a direct phosphorylation of maltose occurred.

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

² A portion of these data was taken from a thesis presented by E. M. Craine to the Graduate Faculty of the University of Illinois to fulfill partial requirements for the degree of Doctor of Philosophy.

³ Supported in part by a grant from the United States Atomic Energy Commission [Contract No. AT(11-1)-67, Project No. 10].