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. 1980 Oct 15;192(1):107–118. doi: 10.1042/bj1920107

Improved purification of brine-shrimp (Artemia saline) (Na+ + K+)-activated adenosine triphosphatase and amino-acid and carbohydrate analyses of the isolated subunits.

G L Peterson, L E Hokin
PMCID: PMC1162313  PMID: 6272692

Abstract

Purification of the (Na+ + K+)-activated ATPase has been improved 2-fold the respect to both purity and yield over the previous method [Peterson, Ewing, Hootman & Conte (1978) J. Biol. Chem. 253, 4762-4770] by using Lubrol WX and non-denaturing concentrations of sodium dodecyl sulphate (SDS). The enzyme was purified 200-fold over the homogenate. The preparation had a specific activity of about 600 mumol of Pi/h per mg of protein, and was about 60% pure according to quantification of Coomassie Blue-stained SDS/polyacrylamide gels. The yield of purified enzyme was about 10 mg of protein per 100g of dry brine-shrimp (Artemia salina) cysts. The method is highly suitable for purification either on a small scale (10-25g of dry cysts) or on a large scale (900g of dry cysts) and methods are described for both. The large (Na+ + K+)-activated ATPase subunit (alpha-subunit) was isolated in pure form by SDS-gel filtration on Bio-Gel A 1.5m. The small subunit (beta-subunit) was eluted with other contaminating proteins on the Bio-Gel column, but was isolated in pure form by extraction from SDS/polyacrylamide gels. The amino acid and carbohydrate compositions of both subunits are reported. The alpha-subunit contained 5.2% carbohydrate by weight, and the beta-subunit 9.2%. Sialic acid was absent from both subunits.

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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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