Using an oligonucleotide probe designed on the basis of the N-terminal amino acid sequence of purified rat aldosterone synthase cytochrome P-450 [(1989) J. Biol. Chem. 264 10935] we have isolated from rat adrenal cDNA library a 2687 base pair cDNA that encodes a protein of 500 amino acid residues. The deduced amino acid sequence contained the regions well conserved among all cytochrome P-450s sequenced to date, and also a portion (residues 25-44) which was identical to the N-terminal peptide sequence of rat aldosterone synthase cytochrome P-450. These results indicate that the cDNA encodes a precursor form of rat aldosterone synthase cytochrome P-450.
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