In enzymology, a prostaglandin-E2 9-reductase (EC 1.1.1.189) is an enzyme that catalyzes the chemical reaction
(5Z,13E)-(15S)-9alpha,11alpha,15-trihydroxyprosta-5,13-dienoate + NADP+ formula_1 (5Z,13E)-(15S)-11alpha,15-dihydroxy-9-oxoprosta-5,13-dienoate + NADPH + H+
Thus, the two substrates of this enzyme are (5Z,13E)-(15S)-9alpha,11alpha,15-trihydroxyprosta-5,13-dienoate and NADP+, whereas its 3 products are (5Z,13E)-(15S)-11alpha,15-dihydroxy-9-oxoprosta-5,13-dienoate, NADPH, and H+.
This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is (5Z,13E)-(15S)-9alpha,11alpha,15-trihydroxyprosta-5,13-dienoate:NADP+ 9-oxidoreductase. Other names in common use include PGE2-9-OR, reductase, 15-hydroxy-9-oxoprostaglandin, 9-keto-prostaglandin E2 reductase, 9-ketoprostaglandin reductase, PGE-9-ketoreductase, PGE2 9-oxoreductase, PGE2 reductase-9-ketoreductase, prostaglandin 9-ketoreductase, prostaglandin E 9-ketoreductase, and prostaglandin E2 reductase-9-oxoreductase. This enzyme participates in arachidonic acid metabolism.
Structural studies.
As of late 2007, 3 structures have been solved for this class of enzymes, with PDB accession codes 1Q13, 1Q5M, and 2PFG.
References.
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