Regulation of Na,K-ATPase biosynthesis in developing Artemia salina

Regulation of the biosynthesis of the sodium- and potassium-activated adenosine triphosphatase (Na,K-ATPase) (EC 3.6.1.3) was studied in the developing brine shrimp, Artemia salina. Measurement of levels of the subunits of the Na,K-ATPase by radioimmunoassay indicated the presence of both alpha and...

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Bibliographic Details
Published in:The Journal of biological chemistry 1986-01, Vol.261 (2), p.515-519
Main Authors: Fisher, J A, Baxter-Lowe, L A, Hokin, L E
Format: Article
Language:English
Subjects:
Animals
Artemia - enzymology
Artemia - growth & development
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Gene expression
Macromolecular Substances
Molecular and cellular biology
Molecular genetics
Molecular Weight
Radioimmunoassay
RNA, Messenger - metabolism
Sodium-Potassium-Exchanging ATPase - biosynthesis
Sodium-Potassium-Exchanging ATPase - genetics
Time Factors
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Summary:Regulation of the biosynthesis of the sodium- and potassium-activated adenosine triphosphatase (Na,K-ATPase) (EC 3.6.1.3) was studied in the developing brine shrimp, Artemia salina. Measurement of levels of the subunits of the Na,K-ATPase by radioimmunoassay indicated the presence of both alpha and beta subunits in undeveloped cysts and developing embryos prior to the appearance of enzymatic activity. The quantity of each subunit increased dramatically between 8 and 24 h of development and then reached a plateau at about 32 h. The quantities of translationally active mRNA alpha and mRNA beta were also determined. Undeveloped cysts contained mRNA alpha and mRNA beta, and the amounts increased 9- and 3-fold, respectively, during the first 24 h of development. The data suggest that the increase in Na,K-ATPase activity was at least in part due to increases in protein synthesis related to changes in mRNA levels. The data also suggest involvement of additional regulatory mechanisms. The alpha-subunit has been detected as two molecular weight forms (alpha 1 and alpha 2) which demonstrate changes in relative amounts during development (Peterson, G. L., Churchill, L., Fisher, J. A., and Hokin, L. E. (1982) J. Exp. Zool. 221, 295-308). We show here that this was not due to changes in mRNA alpha 1 and mRNA alpha 2.
ISSN:0021-9258
1083-351X
DOI:10.1016/S0021-9258(17)36121-5