title: Rainbow trout cytochrome P-450c17 (17 alpha-hydroxylase/17,20-lyase). cDNA cloning, enzymatic properties and temporal pattern of ovarian P-450c17 mRNA expression during oogenesis.
abstract: A cDNA clone encoding cytochrome P-450c17 (17 alpha-hydroxylase/17,20-lyase) was isolated from a rainbow trout ovarian follicle cDNA library. The cDNA contained an open reading frame of 1,542 nucleotides encoding a protein of 514 amino acid residues. The amino acid sequence of trout P-450c17 shows a much greater homology with chicken P-450c17 than with that of human, bovine and rat. The trout P-450c17 expressed in non-steroidogenic mammalian COS-1 cells showed both 17 alpha-hydroxylase and 17,20-lyase activities. The cDNA only hybridized to a single species of mRNA (2.4 kb) isolated from rainbow trout ovaries; the 2.4 kb transcripts were abundant in trout ovaries during the later stages of oogenesis.
authors.affiliation: Laboratory of Reproductive Biology, National Institute for Basic Biology, Okazaki, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Sakai
authors.forename: M
authors.initials: M
authors.lastname: Tanaka
authors.forename: S
authors.initials: S
authors.lastname: Adachi
authors.forename: W L
authors.initials: WL
authors.lastname: Miller
authors.forename: Y
authors.initials: Y
authors.lastname: Nagahama
mesh_terms: D000446:Aldehyde-Lyases / Q000096:biosynthesis / Q000235:genetics*; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002417:Cattle; D002478:Cells, Cultured; D003001:Cloning, Molecular; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis / Q000235:genetics*; D005260:Female; D015723:Gene Library; D006801:Humans; D008969:Molecular Sequence Data; D009866:Oogenesis / Q000502:physiology*; D010053:Ovary / Q000201:enzymology* / Q000378:metabolism; D011284:Pregnenolone / Q000378:metabolism; D011374:Progesterone / Q000378:metabolism; D012333:RNA, Messenger / Q000096:biosynthesis*; D051381:Rats; D011994:Recombinant Proteins / Q000096:biosynthesis; D017386:Sequence Homology, Amino Acid; D013254:Steroid 17-alpha-Hydroxylase; D013799:Theca Cells / Q000201:enzymology; D014162:Transfection; D014337:Trout / Q000235:genetics*
chemical_list: D012333:RNA, Messenger; D011994:Recombinant Proteins; D011374:Progesterone; D011284:Pregnenolone; D003577:Cytochrome P-450 Enzyme System; D013254:Steroid 17-alpha-Hydroxylase; D000446:Aldehyde-Lyases