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In biochemistry, isozymes (also known as isoenzymes or more generally as multiple forms of enzymes) are enzymes that differ in amino acid sequence but catalyze the same chemical reaction. Isozymes usually have different kinetic parameters (e.g. different K M values), or are regulated differently.
Enolase is a member of the large enolase superfamily.It has a molecular weight of 82,000–100,000 daltons depending on the isoform. [3] [4] In human alpha enolase, the two subunits are antiparallel in orientation so that Glu 20 of one subunit forms an ionic bond with Arg 414 of the other subunit. [3]
Hexokinase II/B constitutes the principal regulated isoenzyme in many cell types and is increased in many cancers. 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 ]
Nitric oxide is mediated in mammals by the calcium-calmodulin controlled isoenzymes eNOS (endothelial NOS) and nNOS (neuronal NOS). [2] The inducible isoform, iNOS, involved in immune response, binds calmodulin at physiologically relevant concentrations, and produces NO as an immune defense mechanism, as NO is a free radical with an unpaired ...
Amino acid biosynthesis overview. The drawn molecules are in their neutral forms and do not fully correspond to their presented names. Humans can not synthesize all of these amino acids. Amino acid biosynthesis is the set of biochemical processes (metabolic pathways) by which the amino acids are produced.
This page was last edited on 2 January 2006, at 01:34 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
Acid phosphatase (EC 3.1.3.2, systematic name phosphate-monoester phosphohydrolase (acid optimum)) is an enzyme that frees attached phosphoryl groups from other molecules during digestion.
The antioxidant enzyme glutathione peroxidase 4 (GPX4) belongs to the family of glutathione peroxidases, which consists of 8 known mammalian isoenzymes (GPX1–8).GPX4 catalyzes the reduction of hydrogen peroxide, organic hydroperoxides, and lipid peroxides at the expense of reduced glutathione and functions in the protection of cells against oxidative stress.