Cloning and sequence analysis of cDNA encoding a precursor for human brain natriuretic peptide

Area of Science:

• Biochemistry
• Molecular Biology
• Cardiovascular Research

Background:

• Brain natriuretic peptide (BNP) is a peptide with diuretic, natriuretic, and vasorelaxant properties, initially isolated from porcine brain.
• Mammalian BNP exhibits structural species differences compared to atrial natriuretic peptide (ANP).

Purpose of the Study:

• To determine the amino acid sequence of human BNP.
• To investigate structural similarities and differences between human and porcine BNP.

Main Methods:

• Construction of a human cardiac atrium cDNA library.
• Screening of the library for clones hybridizing with porcine BNP cDNA.
• Sequence analysis of identified cDNA encoding the human BNP precursor.

Main Results:

• Deduced the amino acid sequence of human prepro-BNP, comprising 134 residues.
• Identified a bioactive unit within human prepro-BNP that is highly homologous to porcine BNP-32.
• Confirmed structural homology between human and porcine BNP at the carboxy-terminus.

Conclusions:

• The study successfully determined the human BNP precursor sequence.
• Human BNP shares significant structural homology with porcine BNP, particularly in the bioactive region.
• Findings contribute to understanding BNP structure-function relationships across species.