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Hexokinase II, also known as Hexokinase B and HK2, is an enzyme which in humans is encoded by the HK2 gene on chromosome 2. [5] [6] Hexokinases phosphorylate glucose to produce glucose 6-phosphate, the first step in most glucose metabolism pathways. Hexokinase II is the predominant hexokinase form found in skeletal muscle.
It is the hexokinase found in muscle and heart. Hexokinase II is also located at the mitochondria outer membrane so it can have direct access to ATP. [7] The relative specific activity of hexokinase II increases with pH at least in a pH range from 6.9 to 8.5. [8] Hexokinase III/C is substrate-inhibited by glucose at physiological concentrations.
Hexokinase III, also known as hexokinase C, is an enzyme which in humans is encoded by the Hk3 gene on chromosome 5. [ 5 ] [ 6 ] Hexokinases phosphorylate glucose to produce glucose-6-phosphate , the first step in most glucose metabolism pathways.
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PKM2 is a cytosolic enzyme that is associated with other glycolytic enzymes, i.e., hexokinase, glyceraldehyde 3-P dehydrogenase, phosphoglycerate kinase, phosphoglyceromutase, enolase, and lactate dehydrogenase within a so-called glycolytic enzyme complex. [25] [31] [32] [33]
Hexokinase deficiency is an extremely rare autosomal recessive condition that falls under the category of erythroenzymopathies, or defects in red cell enzymes. [2] Hexokinase deficiency manifests is associated with chronic nonspherocytic hemolytic anemia. [3] Hemolytic anemia seems to be the only clinical sign of hexokinase deficiency. [4]
Hexokinase I, also known as hexokinase A and HK1, is an enzyme that in humans is encoded by the HK1 gene on chromosome 10. Hexokinases phosphorylate glucose to produce glucose-6-phosphate (G6P), the first step in most glucose metabolism pathways. This gene encodes a ubiquitous form of hexokinase which localizes to the outer membrane of ...
Tito4000, i agree that Mg 2+ is essential for the reaction, but you should have not mentioned it because then to keep it fair we have to mention it in ALL articles about enzymes, classical and signaling, that use ATP. In every biochemistry textbook hexokinase is the first enzyme that is discussed, as glycolysis is always the first pathway in ...