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In enzymology, a 6-phosphofructo-2-kinase (EC 2.7.1.105) is an enzyme that catalyzes the chemical reaction: ATP + beta-D-fructose 6-phosphate ADP + beta-D-fructose 2,6-bisphosphate [16] Thus, the kinase domain hydrolyzes ATP to phosphorylate the carbon-2 of fructose-6-phosphate, producing Fru-2,6-P 2 and ADP.
PFK exists as a homotetramer in bacteria and mammals (where each monomer possesses 2 similar domains) and as an octomer in yeast (where there are 4 alpha- (PFK1) and 4 beta-chains (PFK2), the latter, like the mammalian monomers, possessing 2 similar domains [3]). This protein may use the morpheein model of allosteric regulation. [5]
In enzymology, 1-phosphofructokinase (EC 2.7.1.56) is an enzyme that catalyzes the chemical reaction. ATP + D-fructose 1-phosphate → ADP + D-fructose 1,6-bisphosphate. Thus, the two substrates of this enzyme are ATP and D-fructose 1-phosphate, whereas its two products are ADP and D-fructose 1,6-bisphosphate. The enzyme was first described and ...
d -Glucose + 2 [NAD] + + 2 [ADP] + 2 [P] i 2 × Pyruvate 2 × + 2 [NADH] + 2 H + + 2 [ATP] + 2 H 2 O Glycolysis pathway overview The use of symbols in this equation makes it appear unbalanced with respect to oxygen atoms, hydrogen atoms, and charges. Atom balance is maintained by the two phosphate (P i) groups: Each exists in the form of a hydrogen phosphate anion, dissociating to contribute ...
Phosphofructokinase-1 (PFK-1) is one of the most important regulatory enzymes (EC 2.7.1.11) of glycolysis. It is an allosteric enzyme made of 4 subunits and controlled by many activators and inhibitors. PFK-1 catalyzes the important "committed" step of glycolysis, the conversion of fructose 6-phosphate and ATP to fructose 1,6-bisphosphate and ...
Fru-2,6-P 2 strongly activates glucose breakdown in glycolysis through allosteric modulation (activation) of phosphofructokinase 1 (PFK-1).Elevated expression of Fru-2,6-P 2 levels in the liver allosterically activates phosphofructokinase 1 by increasing the enzyme’s affinity for fructose 6-phosphate, while decreasing its affinity for inhibitory ATP and citrate.
The PFKP gene encodes the platelet isoform of phosphofructokinase (PFK) (ATP:D-fructose-6-phosphate-1-phosphotransferase, EC 2.7.1.11). PFK catalyzes the irreversible conversion of fructose 6-phosphate to fructose 1,6-bisphosphate and is a key regulatory enzyme in glycolysis. The PFKP gene, which maps to chromosome 10p, is also expressed in ...
In enzymology, an ADP-specific phosphofructokinase (EC 2.7.1.146) is an enzyme that catalyzes the chemical reaction. ADP + D-fructose 6-phosphate AMP + D-fructose 1,6-bisphosphate. Thus, the two substrates of this enzyme are ADP and D-fructose 6-phosphate, whereas its two products are AMP and D-fructose 1,6-bisphosphate.