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. 1971 Jan;121(2):249–256. doi: 10.1042/bj1210249

Bovine pepsinogens and pepsins. A series of zymogens and enzymes that differ in organic phosphate content

Patricia A Meitner 1, Beatrice Kassell 1
PMCID: PMC1176563  PMID: 4940473

Abstract

Several minor pepsinogens, present in extracts of bovine fundic mucosa obtained from the fourth stomach or abomasum, were separated from the main pepsinogen by chromatography on hydroxyapatite at pH7.3. The major pepsinogen and two of these minor pepsinogens were studied in detail. All three zymogens have N-terminal Ser-Val-, C-terminal -Val-Ala and not more than 1mol of glucose/mol of protein; no significant differences in amino acid composition were found. The pepsinogens differ in their organic phosphate content, which accounts for their chromatographic separation. By activation at 0°C and pH2, a corresponding series of pepsins is formed. These enzymes were separated by hydroxyapatite chromatography at pH5.7. All the pepsins have N-terminal valine, C-terminal alanine and are free from carbohydrate. Again the only difference detected among them is in their organic phosphate content. The pepsins of high phosphate content are converted by an acid phosphatase in vitro into pepsins of low phosphate content.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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