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J. Biol. Chem., Vol. 264, Issue 12, 6689-6692, Apr, 1989

Cloning of a cDNA encoding porcine brain natriuretic peptide

JG Porter, A Arfsten, T Palisi, RM Scarborough, JA Lewicki and JJ Seilhamer
California Biotechnology Inc., Mountain View 94043.

Complimentary DNA (cDNA) clones encoding porcine brain natriuretic peptide (BNP) were isolated from a porcine atrial cDNA library. The longest of the cDNA clones (1507 nucleotides) apparently originated from an unprocessed messenger RNA, since the nucleotide sequence encoding BNP-26 was interrupted by an intron of 554 nucleotides. A partial cDNA clone representing processed BNP mRNA was prepared by polymerase chain reaction. A comparison of the sequence of these two cDNAs reveals the presence of an additional intron within the sequence encoding the BNP precursor. The identification of these introns suggests that the BNP gene structure differs from the atrial natriuretic peptide gene in the location of intron 2. BNP mRNA encodes a propeptide of 131 amino acids, including a signal peptide domain (25 amino acids) and a prohormone domain (106 amino acids). Like atrial natriuretic peptide, the bioactive BNP sequence is localized at the carboxyl terminus of the prohormone. Although the carboxyl-terminal peptide sequences of porcine atrial natriuretic peptide and BNP are well conserved, there is relatively little homology within their propeptide regions.
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