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5743 19225 Ensembl ENSG00000073756 ENSMUSG00000032487 UniProt P35354 Q05769 RefSeq (mRNA) NM_000963 NM_011198 RefSeq (protein) NP_000954 NP_035328 Location (UCSC) Chr 1: 186.67 – 186.68 Mb Chr 1: 149.98 – 149.98 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Cyclooxygenase-2 (COX-2), also known as prostaglandin-endoperoxide synthase 2 (HUGO PTGS2), is an enzyme that in humans is ...
COX is a common target for anti-inflammatory drugs. The most significant difference between the isoenzymes, which allows for selective inhibition, is the substitution of isoleucine at position 523 in COX-1 with valine in COX-2. The smaller Val 523 residue in COX-2 allows access to a hydrophobic side-pocket in the enzyme (which Ile 523 ...
The MT-CO2 gene produces a 25.6 kDa protein composed of 227 amino acids. [6] [7] MT-CO2 is a subunit of the enzyme Cytochrome c oxidase (EC 1.9.3.1) [8] [9] (Complex IV), an oligomeric enzymatic complex of the mitochondrial respiratory chain involved in the transfer of electrons from cytochrome c to oxygen.
Prostaglandins are produced following the sequential oxygenation of arachidonic acid, DGLA or EPA by cyclooxygenases (COX-1 and COX-2) and terminal prostaglandin synthases. The classic dogma is as follows: COX-1 is responsible for the baseline levels of prostaglandins. COX-2 produces prostaglandins through stimulation.
In 1991 the existence of the COX-2 enzyme was confirmed by being cloned by Dr. Dan Simmons at Brigham Young University. Before the confirmation of COX-2 existence, the Dupont company had developed a compound, DuP-697, that was potent in many anti-inflammatory assays but did not have the ulcerogenic effects of NSAIDs. Once the COX-2 enzyme was ...
The conversion from arachidonic acid to prostaglandin H 2 is a two-step process. First, COX-1 catalyzes the addition of two free oxygens to form the 1,2-dioxane bridge and a peroxide functional group to form prostaglandin G 2 (PGG 2). [3] Second, COX-2 reduces the peroxide functional group to a secondary alcohol, forming prostaglandin H 2.
A splice variant of COX-1 termed COX-3 was identified in the central nervous system of dogs, but does not result in a functional protein in humans. Two smaller COX-1-derived proteins (the partial COX-1 proteins PCOX-1A and PCOX-1B) have also been discovered, but their precise roles are yet to be described. [10]
The inhibition of COX-2 is paramount for the anti-inflammatory and analgesic function of the selective COX-2 inhibitor celecoxib. However, with regard to this drug's promise for the therapy of advanced cancers, it is unclear whether the inhibition of COX-2 plays a dominant role, and this has become a controversial and intensely researched issue.