title: cDNA sequence of adrenodoxin reductase. Identification of NADP-binding sites in oxidoreductases.
abstract: Adrenodoxin reductase is an NADP dependent flavoenzyme which functions as the reductase of mitochondrial P 450 systems. We sequenced two adrenodoxin reductase cDNAs isolated from a bovine adrenal cortex cDNA library. The deduced amino acid sequence shows no similarity to the sequence of the microsomal P 450 systems or other known protein sequences. Nonetheless, by sequence analysis and c comparisons with known sequences of dinucleotide-binding folds of two NADP-binding flavoenzymes, two regions of adrenodoxin reductase sequence were identified as the FAD- and NADP-binding sites. These analyses revealed a consensus sequence for the NADP-binding dinucleotide fold (GXGXXAXXXAXXXXXXG, in one-letter amino acid code) that differs from FAD and NAD-binding dinucleotide-fold sequences. In the data base of protein sequences, the NADP-binding-site sequence appears solely in NADP-dependent enzymes, the binding sites of which were not known to date. Thus, this sequence may be used for identification of a certain type of NADP-binding site of enzymes that show no significant sequence similarity.
authors.affiliation: Department of Hormone Research, Weizmann Institute of Science, Rehovot, Israel.
authors.forename: I
authors.initials: I
authors.lastname: Hanukoglu
authors.forename: T
authors.initials: T
authors.lastname: Gutfinger
mesh_terms: D000302:Adrenal Cortex / Q000378:metabolism; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001665:Binding Sites; D002417:Cattle; D003001:Cloning, Molecular; D003062:Codon / Q000235:genetics; D004247:DNA / Q000235:genetics*; D005287:Ferredoxin-NADP Reductase / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D009247:NADH, NADPH Oxidoreductases / Q000235:genetics*; D009249:NADP / Q000378:metabolism; D010957:Plasmids; D012333:RNA, Messenger / Q000235:genetics; D012689:Sequence Homology, Nucleic Acid
chemical_list: D003062:Codon; D012333:RNA, Messenger; D009249:NADP; D004247:DNA; D005287:Ferredoxin-NADP Reductase; D009247:NADH, NADPH Oxidoreductases