Na-linked Transport of Organic Solutes: The Coupling between by E. Heinz (auth.), Erich Heinz (eds.)

By E. Heinz (auth.), Erich Heinz (eds.)

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0 i5.. c 20 No+ K+ Rb+ £: 0~ 0 3 4 5 6 3 4 5 6 Number of Corban Atom in Chain Fig. 9. Selectivity among alkali-metal ions in their cooperation with neutral amino acids to inhibit arginine uptake by the rabbit reticulocyte. Effect of linear chain length and of the presence of an omega-hydroxyl group on the neutral amino acid side chain. The indicated alkali-metal ions were at 72 mN, replacing the corresponding amount of choline. The inhibitory amino acid was at 50 mM, also replacing choline. 05 mM.

Bolis et al. ), North Holland Publ. , Amsterdam (1970). : Progr. Biophys. Chern. 3, 305 (1953). Acta 163,57 (1968). r. Neutral Amino Acids and the Ion Gradient Hypothesis A. A. Eddy Department of Biochemistry, University of Manchester Institute of Science and Technology, Manchester, Great Britain Introduction Current hypotheses about the mechanism of transduction of metabolic energy into osmotic work during the transport of amino acids in mammalian tissues centre about the question how sodium ions and potassium ions affect the process.

No implication is intended that Na+ must enter the site first. See text for discussion. Reproduced with permission from Thomas and Christensen, Biochern. Biophys. Res. Comm. 40, 277 (1970) in uptake, and in the interaction with Na+ for uptake. But this effect occurs only if the hydroxyl group is trans to the carboxyl group. In the cis orientation, the hydroxyl group has only an unfavorable effect on the interaction. We were led therefore to localize the position taken by Na+ somewhat as pictured diagrammatically in Fig.

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