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Question
Biology
Posted 9 months ago
How does citrate from the citric acid cycle affect glycolysis?
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Answer from Sia
Posted 9 months ago
Answer
Citrate from the citric acid cycle inhibits glycolysis by acting as an allosteric inhibitor of phosphofructokinase-1 (PFK-1), a key regulatory enzyme in glycolysis.
Solution
a
Citrate is produced in the citric acid cycle (also known as the Krebs cycle or TCA cycle) within the mitochondria
b
When citrate levels are high, it indicates that the cell has sufficient energy and intermediates for biosynthetic processes
c
Citrate acts as an allosteric inhibitor of phosphofructokinase-1 (PFK-1), the enzyme that catalyzes the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate in glycolysis
d
By inhibiting PFK-1, citrate slows down glycolysis, thereby reducing the production of pyruvate and subsequent entry into the citric acid cycle
Key Concept
Citrate as an allosteric inhibitor
Explanation
Citrate inhibits phosphofructokinase-1 (PFK-1), a key enzyme in glycolysis, thereby regulating the flow of glucose through the glycolytic pathway based on the cell's energy needs.

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