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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.
[1] [11] Celecoxib and parecoxib have a sulfonamide substituent (SO 2 NH 2) in para-position on one of the aryl rings while etoricoxib and rofecoxib have a methylsulfone (SO 2 CH 3). [12] The oxidation state on the sulfur is important for selectivity; sulfones and sulfonamides are selective for COX-2 but sulfoxides and sulfides are not.
Hexokinases I, II, and III are referred to as low-K m isoenzymes because of a high affinity for glucose (below 1 mM). Hexokinases I and II follow Michaelis-Menten kinetics at physiological concentrations of substrates. [citation needed] All three are strongly inhibited by their product, glucose-6-phosphate. Molecular masses are around 100 kDa ...
This is a list of 5α-reductase inhibitors (5α-RIs), drugs which inhibit one or more isoforms of the enzyme 5α-reductase.This enzyme is responsible for the conversion of the androgen hormone testosterone into the more potent dihydrotestosterone (DHT) and is essential for the production of neurosteroids like allopregnanolone, tetrahydrodeoxycorticosterone (THDOC), and 3α-androstanediol from ...
Enolase 1 (ENO1), more commonly known as alpha-enolase, is a glycolytic enzyme expressed in most tissues, one of the isozymes of enolase.Each isoenzyme is a homodimer composed of 2 alpha, 2 gamma, or 2 beta subunits, and functions as a glycolytic enzyme.
Several isozymes are encoded by different genes, which vary in cellular location and substrate specificity. Glutathione peroxidase 1 (GPx1) is the most abundant version, found in the cytoplasm of nearly all mammalian tissues, whose preferred substrate is hydrogen peroxide.
[8] [13] CYP2C9 isoenzyme is the most predominant isoform involved in metabolism of Fluvastatin, but CYP3A4 and CYP2C8 isoenzymes also contribute to the metabolism of Fluvastatin. [13] Rosuvastatin is metabolized to a small degree by CYP2C9 and to a lesser extent by CYP2C19 isoenzymes. Pravastatin is not metabolized by CYP isoenzymes to any ...
The mitochondrial isoenzyme is involved in the Krebs cycle and the cytosolic isoenzyme is involved in the metabolism of amino acids and fumarate. Subcellular localization is established by the presence of a signal sequence on the amino terminus in the mitochondrial form, while subcellular localization in the cytosolic form is established by the ...