title: SDR-O: an orphan short-chain dehydrogenase/reductase localized at mouse chromosome 10/human chromosome 12.
abstract: We report cloning a cDNA that encodes a novel short-chain dehydrogenase/reductase, SDR-O, conserved in mouse, human and rat. Human and mouse liver express SDR-O (short-chain dehydrogenase/reductase-orphan) mRNA intensely. The mouse embryo expresses SDR-O mRNA as early as day seven. Human SDR-O localizes on chromosome 12; mouse SDR-O localizes on chromosome 10 with CRAD1, CRAD2 and RDH4. SDR-O shares highest amino acid similarity with rat RoDH1 and mouse RDH1 (69-70%), but does not have the retinol and 3alpha-hydroxysteroid dehydrogenase activity of either, nor is it active as a 17beta- or 11beta-hydroxysteroid dehydrogenase. Short-chain dehydrogenase/reductases catalyse the metabolism of ligands that bind with nuclear receptors: the occurrence of 'orphan' nuclear receptors may imply existence of 'orphan' SDR, suggesting that SDR-O may catalyse the metabolism of another class of nuclear receptor ligand. Alternatively, SDR-O may not have a catalytic function, but may regulate metabolism by binding substrates/products and/or by serving as a regulatory factor.
authors.affiliation: Department of Nutritional Sciences and Toxicology, University of California, 119 Morgan Hall, MC#3104, Berkeley, CA 94720, USA.
authors.forename: Weiguo
authors.initials: W
authors.lastname: Chen
authors.forename: Min-Sun
authors.initials: MS
authors.lastname: Song
authors.forename: Joseph L
authors.initials: JL
authors.lastname: Napoli
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D016466:CHO Cells; D002874:Chromosome Mapping; D002875:Chromosomes / Q000235:genetics*; D002881:Chromosomes, Human, Pair 12 / Q000235:genetics*; D003001:Cloning, Molecular; D006224:Cricetinae; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D005260:Female; D015971:Gene Expression Regulation, Enzymologic; D006801:Humans; D008297:Male; D051379:Mice; D008969:Molecular Sequence Data; D010088:Oxidoreductases / Q000235:genetics* / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D026801:Synteny
chemical_list: D018076:DNA, Complementary; D012333:RNA, Messenger; D010088:Oxidoreductases; C471160:SDR9C7 protein, human; C471164:Sdr9c7 protein, rat; C471163:Sdro protein, mouse; C022690:succinic-dichloroindophenol reductase