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A cDNA encoding a small common precursor for human pancreatic polypeptide and pancreatic icosapeptide.

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The EMBO Journal, 01 Apr 1984, 3(4):909-912
https://doi.org/10.1002/j.1460-2075.1984.tb01904.x PMID: 6373251 PMCID: PMC557446

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Abstract 

A cDNA for the hormone, human pancreatic polypeptide (PP), was isolated by oligodeoxynucleotide screening from a cDNA library constructed from normal human pancreatic mRNA. The primary structure of the precursor protein as deduced from the cDNA sequence is 95 amino acids long and is composed of a typical, but rather long signal peptide of 29 residues, followed by the sequence of the 36 amino acid human pancreatic polypeptide, which again is separated from the human pancreatic icosapeptide sequence by a classic cleavage and amidation site, Gly-Lys-Arg. The precursor terminates in a heptapeptide which is cleaved from the icosapeptide at a monobasic processing site. Both the size and the structure of the PP precursor was supported by the results of peptide analysis of biosynthetically labeled pro-PP isolated from canine PP cells in which processing was prevented by the arginine analogue canavanine. It is concluded that the precursor for mammalian PP gives rise to two peptide products, the well preserved, carboxyamidated PP and an icosapeptide which is preserved only in its COOH-terminal end, plus a small highly variable COOH-terminal oligopeptide.

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EMBO J. 1984 Apr; 3(4): 909–912.
PMCID: PMC557446
PMID: 6373251

A cDNA encoding a small common precursor for human pancreatic polypeptide and pancreatic icosapeptide.

E Boel, T W Schwartz, K E Norris, and N P Fiil
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Abstract

A cDNA for the hormone, human pancreatic polypeptide (PP), was isolated by oligodeoxynucleotide screening from a cDNA library constructed from normal human pancreatic mRNA. The primary structure of the precursor protein as deduced from the cDNA sequence is 95 amino acids long and is composed of a typical, but rather long signal peptide of 29 residues, followed by the sequence of the 36 amino acid human pancreatic polypeptide, which again is separated from the human pancreatic icosapeptide sequence by a classic cleavage and amidation site, Gly-Lys-Arg. The precursor terminates in a heptapeptide which is cleaved from the icosapeptide at a monobasic processing site. Both the size and the structure of the PP precursor was supported by the results of peptide analysis of biosynthetically labeled pro-PP isolated from canine PP cells in which processing was prevented by the arginine analogue canavanine. It is concluded that the precursor for mammalian PP gives rise to two peptide products, the well preserved, carboxyamidated PP and an icosapeptide which is preserved only in its COOH-terminal end, plus a small highly variable COOH-terminal oligopeptide.

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Selected References

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