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PFK belongs to the phosphofructokinase B (PfkB) family of sugar kinases. [7] Other members of this family (also known as the Ribokinase family) include ribokinase (RK), adenosine kinase (AK), inosine kinase, and 1-phosphofructokinase. [7] [8] [9] The members of the PfkB/RK family are identified by the presence of three conserved sequence motifs.
The lack of PFK blocks the completion of the glycolytic pathway. Therefore, all products past the block would be deficient, including Adenosine triphosphate (ATP). It may affect humans as well as other mammals (especially dogs). [4] It was named after the Japanese physician Seiichiro Tarui (b. 1927), who first observed the condition in 1965. [5]
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 .
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 ...
PFK-2 is known as the "bifunctional enzyme" because of its notable structure: though both are located on one protein homodimer, its two domains act as independently functioning enzymes. [5] One terminus serves as a kinase domain (for PFK-2) while the other terminus acts as a phosphatase domain (FBPase-2). [6]
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This 85-kDa protein is one of two subunit types that comprise the seven tetrameric PFK isozymes. [6] [7] The muscle isozyme is composed solely of PFKM.[6] [8] [9] The liver PFK (PFK-5) contains solely the second subunit type, PFKL, while the erythrocyte PFK includes five isozymes composed of different combinations of PFKM and PFKL.
A futile cycle, also known as a substrate cycle, occurs when two metabolic pathways run simultaneously in opposite directions and have no overall effect other than to dissipate energy in the form of heat. [1] The reason this cycle was called "futile" cycle was because it appeared that this cycle operated with no net utility for the organism.