title: Coding nucleotide, 5' regulatory, and deduced amino acid sequences of P-450BM-3, a single peptide cytochrome P-450:NADPH-P-450 reductase from Bacillus megaterium.
abstract: Cytochrome P-450BM-3 (P-450BM-3) from Bacillus megaterium incorporates both a P-450 and an NADPH:P-450 reductase in proteolytically separable domains of a single, 119-kDa polypeptide and functions as a fatty acid monooxygenase independently of any other protein. A 5-kilobase DNA fragment which contains the gene encoding P-450BM-3 was sequenced. A single continuous open reading frame starting at nucleotide 1541 of the 5-kilobase fragment correctly predicted the previously determined NH2-terminal protein sequences of the trypsin-generated P-450 and reductase domains and, in toto, predicted a mature polypeptide of 1,048-amino acid residues with Mr = 117,641. The trypsin site was found at arginine residue 471. The P-450 domain is most similar (about 25%) to the fatty acid omega-hydroxylases of P-450 family IV, while the reductase domain exhibits some 33% sequence similarity with the NADPH:P-450 reductases of mammalian liver. Both the P-450 and reductase domains of P-450BM-3 define new gene families but contain highly conserved segments which display as much as 50% sequence similarity with P-450s and reductases of eukaryotic origin. The mRNA for P-450BM-3 was found by S1 mapping to be 3,339 +/- 10 nucleotides in length. In the accompanying paper, two regions in the 1.5 kilobases 5' to the P-450BM-3 coding region have been implicated in the regulation of P-450BM-3 gene expression.
authors.affiliation: Department of Biological Chemistry, School of Medicine, University of California, Los Angeles 90024.
authors.forename: R T
authors.initials: RT
authors.lastname: Ruettinger
authors.forename: L P
authors.initials: LP
authors.lastname: Wen
authors.forename: A J
authors.initials: AJ
authors.lastname: Fulco
mesh_terms: D000595:Amino Acid Sequence; D001410:Bacillus megaterium / Q000201:enzymology* / Q000235:genetics; D001426:Bacterial Proteins; D001483:Base Sequence; D001665:Binding Sites; D003001:Cloning, Molecular; D003062:Codon; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics* / Q000378:metabolism; D004262:DNA Restriction Enzymes; D004269:DNA, Bacterial / Q000235:genetics*; D005486:Flavin Mononucleotide / Q000378:metabolism; D005182:Flavin-Adenine Dinucleotide / Q000378:metabolism; D006899:Mixed Function Oxygenases / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009249:NADP / Q000378:metabolism; D009251:NADPH-Ferrihemoprotein Reductase; D010446:Peptide Fragments; D012333:RNA, Messenger / Q000235:genetics; D014158:Transcription, Genetic; D014357:Trypsin
chemical_list: D001426:Bacterial Proteins; D003062:Codon; D004269:DNA, Bacterial; D010446:Peptide Fragments; D012333:RNA, Messenger; D005182:Flavin-Adenine Dinucleotide; D009249:NADP; D005486:Flavin Mononucleotide; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D009251:NADPH-Ferrihemoprotein Reductase; C052423:flavocytochrome P450 BM3 monoxygenases; D004262:DNA Restriction Enzymes; D014357:Trypsin