Puente J, Martínez A M, Beckhaus G, Sapag-Hagar M
Experientia. 1981 May 15;37(5):459-60. doi: 10.1007/BF01986132.
gamma-Glutamyltranspeptidase activity and glutathione levels were studied in rat mammary gland during the lactogenic cycle; both increased during mid-lactation. The enzyme's specific activity with several amino acids showed that glutamine and methionine were the best substrates. Maleate decreased the transpeptidation reaction and increased the hydrolytic activity. These results suggest that gamma-glutamyltranspeptidase from the mammary gland is similar to the enzyme described in other tissues in relation to these properties and the physiological role proposed in amino acids transport.
在大鼠乳腺的泌乳周期中研究了γ-谷氨酰转肽酶活性和谷胱甘肽水平；两者在泌乳中期均升高。该酶对几种氨基酸的比活性表明，谷氨酰胺和蛋氨酸是最佳底物。马来酸盐降低了转肽反应并增加了水解活性。这些结果表明，乳腺中的γ-谷氨酰转肽酶在这些特性以及氨基酸转运中提出的生理作用方面与其他组织中描述的酶相似。
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