title: cDNA cloning of a novel rat brain cytochrome P450 belonging to the CYP2D subfamily.
abstract: Two cDNA clones designated 2d-29 and 2d-35 encoding a novel P450 belonging to the P450 2D subfamily were isolated from control and imipramine-treated rat brain libraries, respectively. cDNA 2d-29 and 2d-35 contained 1786 and 2754 bp nucleotides each. Although their 5'- and 3'-untranslated sequences were different from each other, their open reading frames were identical, encoding a protein which had 5 substitutions of amino acids in the C-terminal region compared with P450 2D4. Northern blot analysis showed that the expression levels of 2d-29 and 2d-35 in the brain were lower than that of P450 2D4 in the liver. However, it is noteworthy that the expression of 2d-35 was not detected in the liver but in the brain. These results suggest that a novel P450 is expressed in the brain under different regulation.
authors.affiliation: Department of Biochemistry and Molecular Biology, University of Texas Medical School, Houston 77225, USA.
authors.forename: H
authors.initials: H
authors.lastname: Kawashima
authors.forename: H W
authors.initials: HW
authors.lastname: Strobel
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001921:Brain / Q000378:metabolism; D003001:Cloning, Molecular; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D018076:DNA, Complementary / Q000235:genetics; D015870:Gene Expression; D007099:Imipramine / Q000494:pharmacology; D008099:Liver / Q000378:metabolism; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D018076:DNA, Complementary; D012333:RNA, Messenger; D003577:Cytochrome P-450 Enzyme System; D007099:Imipramine