title: Nucleotide sequence of a human liver cytochrome P-450 related to the rat male specific form.
abstract: P-450 human-2 is a human cytochrome P-450 that is immunochemically related to a constitutive male-specific cytochrome P-450 (P-450-male) and the phenobarbital-inducible P-450b/e in rat liver. By screening a human liver cDNA library in bacteriophage lambda gt11, we isolated a clone with an insert length of 1,847 bases (pHY13). The clone was sequenced and shown to code for a protein of 487 amino acids. The N-terminal 11-amino-acid sequence was in agreement with the protein sequence of P-450 human-2. The nucleotide sequence of pHY13 showed less than 50% similarity with those of human cytochrome P-450s, pHP-450(1), HLp, P-450NF, P1-450 4, and P3(450), but the nucleotide sequence of pHY13 is 80% similar to the reported sequence of rat cytochrome P-450, P-450(M-1). In addition, the coding sequence of pHY13 showed close similarity to that of MP-8, which was recently reported as the sequence corresponding to human cytochrome P-450MP, although no apparent similarity was observed in their 3' non-coding sequences except for the first 75 bases and the expected length of the complete sequences. These results, together with the immunochemical data, indicate that P-450 human-2 is closely related, but not identical, to P-450MP, and may belong to the category of developmentally regulated constitutive cytochrome P-450s.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D010582:Bacteriophage lambda / Q000235:genetics; D001483:Base Sequence; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D004247:DNA / Q000235:genetics; D004274:DNA, Recombinant; D004790:Enzyme Induction / Q000187:drug effects; D005260:Female; D006801:Humans; D008099:Liver / Q000201:enzymology*; D008297:Male; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009693:Nucleic Acid Hybridization; D010634:Phenobarbital / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D012689:Sequence Homology, Nucleic Acid
chemical_list: D004274:DNA, Recombinant; D012333:RNA, Messenger; D004247:DNA; D003577:Cytochrome P-450 Enzyme System; D010634:Phenobarbital