Human cytochrome P-450 4 mRNA and gene: part of a multigene family that contains Alu sequences in its mRNA

Proc Natl Acad Sci U S A. 1986 Sep;83(18):6731-5. doi: 10.1073/pnas.83.18.6731.


Several overlapping lambda gt11 cDNA clones have been sequenced and shown to encode for the full-length human cytochrome P-450 4. The structure and location of the exons and flanking intron regions were also identified from a lambda EMBL-3 human genomic clone that encodes the full-length human P-450 4 gene. The human P-450 4 mRNA is flanked by 62 base pairs of 5'- and 1508 base pairs of 3'-noncoding sequence, with 1548 bases that encode a protein of 516 amino acids (Mr, 58,376). The predicted amino acid sequence of human P-450 4 is 69% and 70% homologous to its equivalent in mouse and rat, respectively, 75% homologous to rabbit P-450 4, and 68% homologous to human P1-450. The 7.6-kilobase gene encodes 3118 nucleotides of exon sequence that is separated by six introns into seven exons. Exon 7, which is 1802 nucleotides, contains three inverse/complement Alu sequences that are organized in tandem. Comparison of the genomic DNA sequence of the human P-450 4 gene with the human P1-450 and related genes in rat and mouse and the identification of the amino acid residues and triplet codon at each exon-intron junction show that the location of each intron in the human P-450 4 gene is conserved within this gene family. Although the length and homology of the introns within a related gene family may not be conserved, the location of intronic sequences may be an important determinant in the identification of related P-450 genes.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Cytochrome P-450 Enzyme System / analysis
  • Cytochrome P-450 Enzyme System / genetics*
  • DNA / analysis
  • Genes*
  • Humans
  • Mice
  • RNA, Messenger / analysis*
  • Rats
  • Repetitive Sequences, Nucleic Acid*


  • RNA, Messenger
  • DNA
  • Cytochrome P-450 Enzyme System

Associated data

  • GENBANK/L00383
  • GENBANK/L00384
  • GENBANK/L00385
  • GENBANK/L00386
  • GENBANK/L00387
  • GENBANK/L00388
  • GENBANK/L00389
  • GENBANK/M14337