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. 1979 May;63(5):1066–1076. doi: 10.1172/JCI109376

Regulation of the interaction of purified human erythrocyte AMP deaminase and the human erythrocyte membrane.

G M Pipoly, G R Nathans, D Chang, T F Deuel
PMCID: PMC372050  PMID: 36405

Abstract

The binding of purified human erythrocyte AMP deaminase to human erythrocyte membranes and the effect of binding on enzyme catalytic activity was investigated. AMP deaminase binds preferentially and specifically to the cytoplasmic surface of the erythrocyte membrane. The binding is saturable, reversible, and responsive to alterations of pH, of ionic strength, and of ATP and AMP concentrations. A limited number (approximately equal to 2.2 X 10(4) per erythrocyte) of apparently homogeneous high affinity (Ka approximately equal to 2.6 X 10(7) M-1) binding sites is present. The stability of purified and endogenously bound AMP deaminase is markedly improved by the interaction with the membrane, whereas the catalytic activity of AMP deaminase is sharply reduced. AMP deaminase displaces membrane bound glyceraldehyde 3-phosphate dehydrogenase in roughly a dose-response manner. No evidence for binding of AMP deaminase to spectrin or band 3 (the G3PD binding protein) was found in sucrose gradients, however. The interaction of AMP deaminase with the erythrocyte membrane may play an important role in the regulation of cellular adenine nucleotide metabolism.

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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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