title: Cloning of a novel cytochrome P450 (CYP4C15) differentially expressed in the steroidogenic glands of an arthropod.
abstract: Biosynthesis of ecdysteroids, arthropod steroid molting hormones, proceeds from dietary cholesterol through a complex and still incompletely elucidated pathway. Most of the known steps are catalyzed by cytochrome P450 enzymes (CYPs) but none of their genes has yet been identified. We have established a cDNA library of crayfish steroidogenic glands (Y organs). A full length CYP-cDNA was characterized containing a 1539 bp open reading frame encoding a predicted protein of 513 amino acid residues. This novel CYP was assigned to the CYP4 family and designated CYP4C15. Northern blots demonstrated predominant expression of this gene in the active molting glands, suggesting a role in ecdysteroid biosynthesis rather than detoxification.
authors.affiliation: Ecole Normale Supérieure, 46 rue d'Ulm, Paris, CNRS-EP2028, F-75005, France.
authors.forename: C
authors.initials: C
authors.lastname: Dauphin-Villemant
authors.forename: D
authors.initials: D
authors.lastname: Böcking
authors.forename: M
authors.initials: M
authors.lastname: Tom
authors.forename: M
authors.initials: M
authors.lastname: Maïbèche
authors.forename: R
authors.initials: R
authors.lastname: Lafont
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D003400:Astacoidea / Q000201:enzymology* / Q000235:genetics; D001483:Base Sequence; D015152:Blotting, Northern; D003001:Cloning, Molecular; D003577:Cytochrome P-450 Enzyme System / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D000072470:Cytochrome P450 Family 4; D018076:DNA, Complementary / Q000737:chemistry / Q000302:isolation & purification; D026461:Ecdysteroids; D008969:Molecular Sequence Data; D018978:Molting; D012313:RNA / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013256:Steroids / Q000096:biosynthesis
chemical_list: D018076:DNA, Complementary; D026461:Ecdysteroids; D013256:Steroids; D012313:RNA; D003577:Cytochrome P-450 Enzyme System; D000072470:Cytochrome P450 Family 4; C400365:cytochrome P450 CYP4C15 (crayfish)