By Ronald W. Estabrook and Paul Srere (Eds.)

ISBN-10: 0121528189

ISBN-13: 9780121528188

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The marked decrease in the plasma level of glutathione found after inhibition of glutathione synthesis in- GLUTATHIONE METABOLISM AND TRANSPORT CYCLES 39 dicates that there is normally a substantial flow of glutathione into the plasma. g, kidney) can act on the glutathione that they synthesize and translocate to the membrane-bound enzyme. The very low concentration of glutathione in the blood plasma shows that glutathione is effectively removed from the circulation. Glutathionuria induced by administration of transpeptidase inhib­ itors seems to provide an experimental animal model for the human disease in which there is deficiency of transpeptidase activity.

Administration of amino acids leads to effects t h a t can best be explained in terms of increased tr anspeptida tion. IV. , in the blood plasma). γ-Glutamyl transpeptidase is bound to the membranes of cells at sites t h a t are extensively involved in transport phenomena. Since γ-glutamyl transpeptidase is accessible to externally supplied sub­ strates, it has been concluded t h a t this enzyme is bound to the outer surface of the cell membrane. For example, suspensions of lymphoid cells can act on γ-glutamyl substrates t h a t are impermeable to the cell membrane, and disruption of such cells does not lead to increased transpeptidase activity (110).

And Cohen, P. ,Proc. NatL Acad. Sei. A. 77, 7044-7048(1980). 106. , and Cohen, P. , J . Biol. , 256,4127-4132 (1981). 107. Cohen, P. , in "The Urea Cycle" (S. Grisolia, R. Baguena, and F. ), pp. 21-38. Wiley, New York, 1976. 108. , Paik, W. , and Cohen, P. yProc. NatL Acad. Sei. A. 69, 3530-3533 (1972). 109. , in "The Urea Cycle" (S. Grisolia, R. Baguena, and F. ), pp. 181-219. Wiley, New York, 1976. 110. , in "The Urea Cycle" (S. Grisolia, R. Baguena, and F. ), pp. 221-235. Wiley, New York, 1976.

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Biological Cycles by Ronald W. Estabrook and Paul Srere (Eds.)

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