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- W10933997 abstract "Phosphofructokinase is known to associate with the human erythrocyte membrane both in vitro and in vivo. Such association activates the enzyme in vitro by relieving the allosteric inhibition imposed by ATP (Karadsheh, N.S., and Uyeda, K. (1977) J. Biol. Chem. 252, 7418-7420). We now demonstrate that ADP, ATP, and NADH, all of which are known to bind to the enzyme's adenine nucleotide activation site, are particularly potent in eluting the enzyme from the membrane. In addition, both inside-out red cell membrane vesicles and a 23-kDa fragment containing the amino terminus of the membrane protein, band 3, cause a slow, partial, and reversible inactivation of phosphofructokinase. The dependence of the residual phosphofructokinase activity on phosphofructokinase concentration demonstrates that inactivation occurs through the dissociation of active tetramers to inactive dimers. Dimers of phosphofructokinase associate with the membrane more avidly than tetramers. The kinetics of phosphofructokinase inactivation are consistent with the dissociation of tetramers in solution followed by the binding of dimers to the membrane. There is no indication of an association equilibrium between tetramers and dimers of phosphofructokinase bound to the membrane. Taken together, these results suggest that the amino-terminal segment of band 3 binds to the adenine nucleotide activation site, which is thought to be located in a cleft between the dimeric subunits of phosphofructokinase. As a result, band 3 not only rapidly activates the phosphofructokinase tetramer but also slowly inactivates the enzyme by preferentially binding its dissociated subunits." @default.
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- W10933997 date "1985-09-01" @default.
- W10933997 modified "2023-09-29" @default.
- W10933997 title "Mode of interaction of phosphofructokinase with the erythrocyte membrane." @default.
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- W10933997 doi "https://doi.org/10.1016/s0021-9258(19)85100-1" @default.
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