title: Isolation and characterization of a novel cytochrome P-450-like pseudogene.
abstract: A rabbit liver P-450-like pseudogene has been isolated from a lambda phage genomic library. Sequence analysis revealed structural homology with respect to the rat P-450b and P-450e genes as well as a similar intron-exon organization. A 5'-proximal TATA box-like sequence and two 3'-distal putative polyadenylation signals were identified, and all putative intron-exon boundaries except at the 3'-splice site of intron 2 were found to follow the GT/AG rule. With allowance for apparent deletions and insertions, the structural homology of the amino acid sequence deduced from the pseudogene with respect to rabbit P-450 isozyme 2 is lower for exons 1 through 4 (18-28%) than for exons 5 through 9 (42-65%). S1 nuclease mapping showed that mRNAs complementary to the DNA sequence of exon 9 are expressed. However, due to the alterations in the pseudogene, it appears that functional P-450 would not be produced from such mRNAs.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D004247:DNA / Q000235:genetics; D004262:DNA Restriction Enzymes; D004720:Endonucleases; D010634:Phenobarbital; D011817:Rabbits; D012689:Sequence Homology, Nucleic Acid; D015719:Single-Strand Specific DNA and RNA Endonucleases
chemical_list: D004247:DNA; D003577:Cytochrome P-450 Enzyme System; D004720:Endonucleases; D004262:DNA Restriction Enzymes; D015719:Single-Strand Specific DNA and RNA Endonucleases; D010634:Phenobarbital