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ATP is an allosteric inhibitor: high ATP stabilizes the less-active PFK-1 state and lowers glycolytic flux. Fructose-2,6-bisphosphate (F-2,6-BP) is a potent activator: it increases PFK-1 activity and counteracts ATP inhibition, thereby increasing flux. Structural and biochemical analyses support reciprocal regulation by ATP, citrate, and F-2,6-BP.
Long Answer
Two allosteric regulators
1. ATP β inhibitor When cellular energy charge is high, ATP binds regulatory sites on PFK-1 and decreases its apparent affinity for fructose-6-phosphate. The enzyme therefore operates more slowly, reducing conversion of fructose-6-phosphate to fructose-1,6-bisphosphate and lowering glycolytic flux. ATP inhibition is physiologically coherent as feedback: abundant ATP signals reduced immediate need for substrate-level glycolytic ATP production. Citrate can reinforce this inhibition, although citrate is not counted as one of the two regulators here.
2. Fructose-2,6-bisphosphate β activator F-2,6-BP binds a regulatory site on PFK-1 and strongly increases enzyme activity, including under conditions in which ATP would otherwise inhibit the enzyme. This shifts PFK-1 toward its active state, increasing fructose-1,6-bisphosphate formation and generally increasing glycolytic flux. Its concentration is controlled by the bifunctional PFK-2/FBPase-2 system, so hormonal and nutritional signals can regulate glycolysis indirectly by changing F-2,6-BP abundance.
Important qualification
βMain control pointβ is useful shorthand, not an absolute rule: measured glycolytic flux also depends on substrate supply, product removal, other irreversible steps, compartmentation, cell type, and signaling. The supplied evidence record on hypoxic cancer cells reports reduced PFK-1 gene expression after diindolylmethane exposure, but it does not directly test ATP or F-2,6-BP binding and therefore cannot serve as a direct study of these two allosteric mechanisms.
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PFK-1 alone determines glycolytic flux; this is too strong because upstream glucose transport, hexokinase, downstream product removal, and cell-specific pathway architecture can also become limiting.
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