Structure of the two related elastase genes expressed in the rat pancreas

G. H. Swift, C. S. Craik, S. J. Stary, C. Quinto, R. G. Lahaie, W. J. Rutter, R. J. MacDonald

Research output: Contribution to journalArticle

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Abstract

We have isolated and characterized rat genomic DNA fragments bearing the two secretory elastase genes that are expressed in the exocrine pancreas. The complete exonic sequences for each of the genes as well as considerable intronic and flanking sequences are reported. Each elastase gene is interrupted by seven intervening sequences which are located at corresponding positions within the two genes, with one exception: the third intron of the elastase II gene has shifted one codon in the 5' direction. The placement of introns within the amino acid coding domains in part may reflect the formation of the progenitor serine protease gene by the duplication of an exon encoding a characteristic polypeptide structure comprising three β sheets. The activation peptides of the zymogens and the signal peptides, which form discrete functional domains in the protein precursors, are encoded by separate exons. In addition to the TATAA box, the two genes share considerable sequence similarity in the 5'-proximal flanking region (up to ~ 450 base pairs upstream); however, a number of gaps must be introduced to optimize the sequence alignment. The similarities are largely confined to six oligonucleotide region with greater than 70% sequence conservation. The elastase I gene has a perfect repeating copolymer (GT)24 located 427-379 nucleotides upstream from the start of transcription. The elastase II gene has a similar GT-rich region (52/55 G or T) located 384-330 nucleotides upstream. Comparison of the 5'-flanking regions of the two elastase genes with those of pancreatic chymotrypsin and trypsin I and II reveals that one of the six conserved oligonucleotide regions is generally conserved for these genes as well. This conserved region contains putative enhancer core sequences.

Original languageEnglish (US)
Pages (from-to)14271-14278
Number of pages8
JournalJournal of Biological Chemistry
Volume259
Issue number22
StatePublished - 1984

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Pancreatic Elastase
Rats
Pancreas
Genes
Introns
5' Flanking Region
Oligonucleotides
Exons
Nucleotides
Bearings (structural)
Exocrine Pancreas
Peptides
Enzyme Precursors
Gene Duplication
Protein Precursors
Sequence Alignment
Serine Proteases
Protein Sorting Signals
Codon
Base Pairing

ASJC Scopus subject areas

  • Biochemistry

Cite this

Swift, G. H., Craik, C. S., Stary, S. J., Quinto, C., Lahaie, R. G., Rutter, W. J., & MacDonald, R. J. (1984). Structure of the two related elastase genes expressed in the rat pancreas. Journal of Biological Chemistry, 259(22), 14271-14278.

Structure of the two related elastase genes expressed in the rat pancreas. / Swift, G. H.; Craik, C. S.; Stary, S. J.; Quinto, C.; Lahaie, R. G.; Rutter, W. J.; MacDonald, R. J.

In: Journal of Biological Chemistry, Vol. 259, No. 22, 1984, p. 14271-14278.

Research output: Contribution to journalArticle

Swift, GH, Craik, CS, Stary, SJ, Quinto, C, Lahaie, RG, Rutter, WJ & MacDonald, RJ 1984, 'Structure of the two related elastase genes expressed in the rat pancreas', Journal of Biological Chemistry, vol. 259, no. 22, pp. 14271-14278.
Swift GH, Craik CS, Stary SJ, Quinto C, Lahaie RG, Rutter WJ et al. Structure of the two related elastase genes expressed in the rat pancreas. Journal of Biological Chemistry. 1984;259(22):14271-14278.
Swift, G. H. ; Craik, C. S. ; Stary, S. J. ; Quinto, C. ; Lahaie, R. G. ; Rutter, W. J. ; MacDonald, R. J. / Structure of the two related elastase genes expressed in the rat pancreas. In: Journal of Biological Chemistry. 1984 ; Vol. 259, No. 22. pp. 14271-14278.
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