Editing Enzyme (section)

====Organ specialization====
In [[multicellular]] [[eukaryote]]s, cells in different [[organ (anatomy)|organs]] and [[tissue (biology)|tissues]] have different patterns of [[gene expression]] and therefore have different sets of enzymes (known as [[isozyme]]s) available for metabolic reactions. This provides a mechanism for regulating the overall metabolism of the organism. For example, [[hexokinase]], the first enzyme in the [[glycolysis]] pathway, has a specialized form called [[glucokinase]] expressed in the liver and [[pancreas]] that has a lower [[affinity (pharmacology)|affinity]] for glucose yet is more sensitive to glucose concentration.<ref>{{cite journal | vauthors = Kamata K, Mitsuya M, Nishimura T, Eiki J, Nagata Y | title = Structural basis for allosteric regulation of the monomeric allosteric enzyme human glucokinase | journal = Structure | volume = 12 | issue = 3 | pages = 429–438 | date = March 2004 | pmid = 15016359 | doi = 10.1016/j.str.2004.02.005 | doi-access = free }}</ref> This enzyme is involved in sensing [[blood sugar]] and regulating insulin production.<ref>{{cite journal | vauthors = Froguel P, Zouali H, Vionnet N, Velho G, Vaxillaire M, Sun F, Lesage S, Stoffel M, Takeda J, Passa P | title = Familial hyperglycemia due to mutations in glucokinase. Definition of a subtype of diabetes mellitus | journal = The New England Journal of Medicine | volume = 328 | issue = 10 | pages = 697–702 | date = March 1993 | pmid = 8433729 | doi = 10.1056/NEJM199303113281005 | doi-access = free }}</ref>