PMID: 6372Jan 1, 1976

Sugar and amino acid transport in animal cells

Horizons in Biochemistry and Biophysics
U Hopfer


The molecular basis of intracellular metabolism of nutrients and its control is quite well understood in animal cells. Comparable knowledge about solute entry into cells is still lacking, as, in contrast to metabolism, no chemical reactions seem to be directly associated with the known nutrient transport. Nevertheless, translocations of sugars and amino acids across the plasma membrane are specific and controlled processes, biologically as well as chemically. Recent advances in techniques for isolation of plasma membranes have made it feasible to study transport properties of animal cells without the complications encoutered in viable cells. This approach has been applied to sugar and amino acid transport in plasma membranes of several tissues, and intact transport systems for D-glucose, D-fructose, neutral L-amino acids, and dipeptides have been demonstrated. This demonstration of intact transport systems in an in vitro setting accomplishes the first step in the direction of molecular isolation of transport systems. Furthermore, the information obtained about the transport mechanism catalyzed by some systems has settled controversies on active nutrient transport. For example, electrogenic cotransport of sodium and D-glucose or...Continue Reading

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