Sequences of gastrins purified from a single antrum of dog and of goat

C. Bonato, J. Eng, J. D. Hulmes, M. Miedel, Y. C.E. Pan, R. S. Yalow

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Heptadecapeptide gastrins (G17) have been purified and sequenced from a variety of species. However, progastrin (G34) sequences have been determined only for pig and human from purified peptides and for rat from cDNA. Since G34 in most species accounts for only ∼5% of total antral gastrin, micropurification techniques must be employed to avoid the need for large quantities of antral tissue. Efficient purification methodology yielded 1.5 and 1.3 nmol of G34 from the antrum of a single goat and of a single dog, respectively. The N-terminal pyroglutamyl residues were enzymatically removed and the peptides were sequenced through to the proximity of their COOH-termini. The COOH-terminal sequences of goat and dog G34 were confirmed by sequencing the corresponding deblocked G17 from each animal. The previously published dog G17 sequence was shown to be incorrect. The sequences for dog and goat G34 are: |Dog <ELGLQGPPQLVADLSKKQGPWMEEEEAAYGWMDF# |Goat <ELGLQDPPHMVADLSKKQGPWVEEEEAAYGWMDF#. Dog and goat gastrins differ in 3 sites in the 17 amino acid NH2-terminus and only a single site in G17 (the sites of differences are underlined). The ratio for sulfated to non-sulfated antral G17 is 9:1 for the goat and 1:9 for the dog.

Original languageEnglish
Pages (from-to)689-693
Number of pages5
JournalPeptides
Volume7
Issue number4
DOIs
StatePublished - 1986
Externally publishedYes

Keywords

  • Amino acid sequences
  • Dog progastrin
  • Goat progastrin
  • Micropurification techniques

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