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. 1970 Jul;10(7):585–609. doi: 10.1016/s0006-3495(70)86322-6

Quantitative Predictions of a Noncarrier Model for Glucose Transport across the Human Red Blood Cell Membrane

W R Lieb, W D Stein
PMCID: PMC1367784  PMID: 5449913

Abstract

There is an increasing amount of experimental data on transport across biological membranes which cannot be readily accommodated by classical mobile carrier models. We propose models for membrane transport based upon current concepts in molecular enzymology, in which the membrane component involved in transport is an oligomeric protein which undergoes substrate-induced conformational changes. A number of paradoxical observations on glucose transport in the human erythrocyte are explained if the protein involved is a tetramer possessing two classes of binding sites with different affinities for glucose. We develop in detail a particular model of this type, the internal transfer model, in which transport occurs by transfer of substrate from one subunit to another of the protein. The fit of the predictions of the internal transfer model with most of the experimental data is very good. Those data which cannot be fitted by the model cannot be accounted for by any presently available model. We extend our model qualitatively to include the sodium-activated cotransport systems for sugars and amino acids.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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