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Journal of Dairy Science Vol. 61 No. 3 309-314
© 1978 by American Dairy Science Association ®
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{gamma}-Glutamyl Transpeptidase in Lactating Mammary Secretory Tissue of Cow and Rat1

Craig R. Baumrucker and Paul A. Pocius

Department of Dairy Science, University of Illinois, Urbana 61801

ABSTRACT

Lactating cow and rat tissues were examined for {gamma}-glutamyl transpeptidase. The specificity of the enzyme for various amino acid acceptors was determined for mammary tissue. The relative specific activity of {gamma}-glutamyl transpeptidase was high in cow mammary tissue and lower in rat mammary tissue in relation to the activity in kidney of the respective mammals. However, activity per gram wet weight of mammary tissues appeared equivalent. {gamma}-Glutamyl transpeptidase activity towards specific amino acids agreed with the percent extractions of these amino acids by the mammary gland of the lactating cow in vivo. We believe this is the first evidence of a possible system of amino acid transport by mammary tissues.

FOOTNOTES

1 This work was supported by a University of Illinois Agriculture Experiment Station project.






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Copyright © 1978 by the American Dairy Science Association ®.