Molecular oxygen (a substrate of the cyclooxygenase reaction) in the kinetic mechanism of the bifunctional enzyme prostaglandin-H-synthase
Prostaglandin-H-synthase is a bifunctional enzyme catalyzing conversion of arachidonic acid into prostaglandin H2 as a result of cyclooxygenase and peroxidase reactions. The dependence of the rate of the cyclooxygenase reaction on oxygen concentration in the absence and in the presence of electron d...
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| Veröffentlicht in: | Biochemistry (Moscow) 2007-09, Vol.72 (9), p.944-953 |
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| container_title | Biochemistry (Moscow) |
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| creator | Filimonov, I S Vrzheshch, P V |
| description | Prostaglandin-H-synthase is a bifunctional enzyme catalyzing conversion of arachidonic acid into prostaglandin H2 as a result of cyclooxygenase and peroxidase reactions. The dependence of the rate of the cyclooxygenase reaction on oxygen concentration in the absence and in the presence of electron donor was determined. A two-dimensional kinetic scheme accounting for independent proceeding and mutual influence of the cyclooxygenase and peroxidase reactions and also for hierarchy of the rates of these reactions was used as a model. In the context of this model, it was shown that there are irreversible stages in the mechanism of the cyclooxygenase reaction between points of substrate donation (between donation of arachidonic acid and the first oxygen molecule and also between donation of two oxygen molecules). |
| doi_str_mv | 10.1134/S0006297907090040 |
| format | Article |
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The dependence of the rate of the cyclooxygenase reaction on oxygen concentration in the absence and in the presence of electron donor was determined. A two-dimensional kinetic scheme accounting for independent proceeding and mutual influence of the cyclooxygenase and peroxidase reactions and also for hierarchy of the rates of these reactions was used as a model. In the context of this model, it was shown that there are irreversible stages in the mechanism of the cyclooxygenase reaction between points of substrate donation (between donation of arachidonic acid and the first oxygen molecule and also between donation of two oxygen molecules).</description><identifier>ISSN: 0006-2979</identifier><identifier>EISSN: 1608-3040</identifier><identifier>DOI: 10.1134/S0006297907090040</identifier><identifier>PMID: 17922652</identifier><language>eng</language><publisher>United States: Springer</publisher><subject>Arachidonic acid ; Arachidonic Acid - metabolism ; Chemical properties ; Chemical reactions ; Cyclooxygenases ; Electrons ; Enzymes ; Kinetics ; Measurement ; Models, Biological ; Molecular biology ; Oxidation-Reduction ; Oxygen ; Oxygen - metabolism ; Prostaglandin-Endoperoxide Synthases - metabolism ; Prostaglandins ; Prostaglandins G - metabolism</subject><ispartof>Biochemistry (Moscow), 2007-09, Vol.72 (9), p.944-953</ispartof><rights>COPYRIGHT 2007 Springer</rights><rights>Nauka/Interperiodica 2007</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c354t-2a4f586823d813cd1be260fb4a8854e91178b71560c0dc3cfb7072f77876b1483</citedby><cites>FETCH-LOGICAL-c354t-2a4f586823d813cd1be260fb4a8854e91178b71560c0dc3cfb7072f77876b1483</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/17922652$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Filimonov, I S</creatorcontrib><creatorcontrib>Vrzheshch, P V</creatorcontrib><title>Molecular oxygen (a substrate of the cyclooxygenase reaction) in the kinetic mechanism of the bifunctional enzyme prostaglandin-H-synthase</title><title>Biochemistry (Moscow)</title><addtitle>Biochemistry (Mosc)</addtitle><description>Prostaglandin-H-synthase is a bifunctional enzyme catalyzing conversion of arachidonic acid into prostaglandin H2 as a result of cyclooxygenase and peroxidase reactions. 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| source | MEDLINE; SpringerNature Journals |
| subjects | Arachidonic acid Arachidonic Acid - metabolism Chemical properties Chemical reactions Cyclooxygenases Electrons Enzymes Kinetics Measurement Models, Biological Molecular biology Oxidation-Reduction Oxygen Oxygen - metabolism Prostaglandin-Endoperoxide Synthases - metabolism Prostaglandins Prostaglandins G - metabolism |
| title | Molecular oxygen (a substrate of the cyclooxygenase reaction) in the kinetic mechanism of the bifunctional enzyme prostaglandin-H-synthase |
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